NCHRP 20-05 [Active]
Synthesis of Information Related to Highway Practices
| Project Data
||Christopher J. Hedges
||Transportation Research Board|
||Jon M. Williams, and Donna L. Vlasak|
$7,360,000 FY 1968-89
$650,000 FY 1990
$600,000 annually FY 1991-92
$790,000 FY 1993
$800,000 FY 1994
$900,000 annually FY 1995-96
$850,000 FY 1997
$1,000,000 FY 1998-99
$1,200,000 FY 2003-10
$1,500,000 FY 2011 -14
$1,750,000 FY2015 - 16
Background: Administrators, practicing engineers, and researchers continually face highway problems on which much information already exists, either in documented form or in terms of undocumented experience and practice. Unfortunately, this information is often fragmented, scattered, and under evaluated. Often it is unknown to the person normally responsible for initiating changes related to the topic (changes in specifications, procedures, etc.). As a consequence, full information on what has been learned about a valuable experience may be overlooked, and due consideration may not be given to recommended practices for solving or alleviating the problem.
Objective: In this project, particular highway problems, or sets of closely related problems, are designated as topics for information synthesis. For each topic the project objectives are as follows: (1) locate and assemble documented information; (2) learn what engineering practice has been used for solving or alleviating the problem; (3) identify all ongoing research; (4) learn what problems remain largely unsolved; (5) organize, evaluate, and document the useful information that is acquired; and (6) evaluate the effectiveness of the synthesis after it has been in the hands of its users for a period of time.
Status: The Project Committee last met in May 2013 and selected twelve new topics, and four alternates, under the 45-00 series. The FY 2013 topics have been initiated. The Committee next meets in May 2014 to select the next series.
Product Availability: NCHRP Research Results Digest 377 outlines the NCHRP synthesis research process and provides a list of ongoing and completed NCHRP synthesis reports. Four hundred syntheses of highway practice have been prepared and published under this project thus far. They are available on the TRB Website and at the TRB Bookstore. NCHRP Research Results Digest 377 summarizes the status of the synthesis project from the beginning through the 44-00 series.
20-05/Topic 03-03 Telecommunications Systems for Highway Administration and Operations
20-05/Topic 03-03 Radio Spectrum Frequency Management
20-05/Topic 03-05 Pavement Traffic Marking: Materials and Application Affecting Serviceability
20-05/Topic 04-04 Rest Areas
20-05/Topic 04-06 Highway Location Reference Methods
20-05/Topic 04-09 Treatment of Soft Foundations for Highway Embankments
20-05/Topic 05-01 Reconditioning High-Volume Freeways in Urban Areas
20-05/Topic 05-02 Design and Control of Freeway Off-Ramp Terminals
20-05/Topic 05-03 Acquisition and Use of Geotechnical Information
20-05/Topic 05-04 Design of Pile Foundations
20-05/Topic 05-05 Partial-Lane Pavement Widening
20-05/Topic 05-07 Effect of Weather on Highway Construction
20-05/Topic 05-08 Highway Tunnel Operations
20-05/Topic 05-13 Effects of Studded Tires
20-05/Topic 06-01 Instrumentation and Equipment for Testing Highway Materials, Products, and Performance
20-05/Topic 06-02 Statistically Oriented End-Result Specifications
20-05/Topic 06-05 Rapid-Setting Materials for Patching Concrete
20-05/Topic 07-01 Consolidation of Concrete for Pavements, Bridge Decks, and Overlays
20-05/Topic 07-02 Staffing and Management for Social, Economic, and Environmental Impact Assessments
20-05/Topic 07-04 Recording and Reporting Methods for Highway Maintenance Expenditures
20-05/Topic 07-05 Energy Effects, Efficiencies, and Prospects for Various Modes of Transportation
20-05/Topic 07-06 Joint-Related Distress in PCC Pavement: Cause, Prevention, and Rehabilitation
20-05/Topic 07-07 Priority Programming and Project Selection
20-05/Topic 08-01 Recycling Materials for Highways
20-05/Topic 08-02 Construction Contract Staffing
20-05/Topic 08-03 Design and Use of Highway Shoulders
20-05/Topic 08-05 Precast Concrete Elements for Transportation Facilities
20-05/Topic 08-06 Storage and Retrieval Systems for Highway and Transportation Data
20-05/Topic 08-08 Management and Selection Systems for Highway Maintenance Equipment
20-05/Topic 08-09 Open-Graded Friction Courses for Highways
20-05/Topic 08-10 Photologging
20-05/Topic 08-11 Relationship of Asphalt Cement Properties to Pavement Durability
20-05/Topic 08-12 Bituminous Patching Mixtures
20-05/Topic 09 Construction of Embankments
20-05/Topic 09-03 Changeable Message Signs
20-05/Topic 09-05 Quality Assurance
20-05/Topic 09-06 Alternative Work Schedules: Impacts on Transportation
20-05/Topic 09-07 Direction Finding from Arterials to Destinations
20-05/Topic 09-08 Failure and Repair of Continuously Reinforced Concrete Pavement
20-05/Topic 09-09 State Resources for Financing Transportation Programs
20-05/Topic 09-10 Design of Sedimentation Basins
20-05/Topic 09-11 Glare Screen Guidelines
20-05/Topic 10-01 Consequences of Deferred Maintenance
20-05/Topic 10-03 Formulating and Justifying Highway Maintenance Budgets
20-05/Topic 10-04 Motor Vehicle Size and Weight Regulations, Enforcement, and Permit Operations
20-05/Topic 10-05 Collection and Use of Pavement Condition Data
20-05/Topic 10-06 Bridge Drainage Systems
20-05/Topic 10-08 Underwater Inspection and Repair of Bridge Substructures
20-05/Topic 10-11 State Transit-Management Assistance to Local Communities
20-05/Topic 10-21 Effects of Traffic-Induced Vibrations on Bridge Deck Repairs
20-05/Topic 11 Getting Research Findings into Practice
20-05/Topic 11-01 Transportation Needs Study and Financial Constraints
20-05/Topic 11-02 Value Engineering in Preconstruction and Construction
20-05/Topic 11-03 Value Engineering in Preconstruction and Construction
20-05/Topic 11-04 Minimizing Reflection Cracking of Pavement Overlays
20-05/Topic 11-06 Geotechnical Instrumentation for Monitoring Field Performance
20-05/Topic 11-07 Pavement Subsurface Drainage Systems
20-05/Topic 11-08 Evaluation of Pavement Maintenance Strategies
20-05/Topic 11-09 Transit Boards-Composition, Roles, and Procedures
20-05/Topic 11-10 Contract Time Determination
20-05/Topic 11-13 Bus Transit Accessibility for the Handicapped in Urban Areas
20-05/Topic 11-14 Experiences in Transportation System Management
20-05/Topic 12-01 Evaluation Criteria and Priority Setting for State Highway Programs
20-05/Topic 12-02 Criteria for Evaluation of Truck Weight Enforcement Programs
20-05/Topic 12-03 Highway Accident Analysis Systems
20-05/Topic 12-04 Resealing Joints and Cracks in Rigid and Flexible Pavements
20-05/Topic 12-06 Shallow Foundations for Highway Structures
20-05/Topic 12-07 Highway Noise Barriers
20-05/Topic 12-08 Coordination of Transportation System Management and Land Use Management
20-05/Topic 12-09 Energy Involved in Construction Materials and Procedures
20-05/Topic 12-11 Bridge Designs to Reduce and Facilitate Maintenance and Repair
20-05/Topic 12-12 New-Product Evaluation Procedures
20-05/Topic 13-01 Construction Contract Claims: Causes and Methods of Settlement
20-05/Topic 13-02 Methods of Cost-Effectiveness Analysis for Highway Projects
20-05/Topic 13-03 Managing State Highway Finance
20-05/Topic 13-04 Resurfacing with Portland Cement Concrete
20-05/Topic 13-05 Statewide Transportation Planning
20-05/Topic 13-06 Transit Ownership/Operation Options for Small Urban and Rural Areas
20-05/Topic 13-07 Storm Water Management for Transportation Facilities
20-05/Topic 13-08 Bridge Weight-Limit Posting Practice
20-05/Topic 13-10 Risk Assessment Processes for Hazardous Materials Transportation
20-05/Topic 13-11 Historic Bridges-Criteria for Decision Making
20-05/Topic 14-01 Practical Guidelines for Minimizing Tort Liability
20-05/Topic 14-02 Management of Traffic Signal Maintenance
20-05/Topic 14-03 Reducing Construction Conflicts Between Highway and Utilities
20-05/Topic 14-04 Asphalt Overlay Design Procedures
20-05/Topic 14-05 Material Certification and Material-Certification Effectiveness
20-05/Topic 14-06 Maintenance Management Systems
20-05/Topic 14-07 Maintenance Activities Accomplished by Contract
20-05/Topic 14-08 Criteria for Use of Asphalt Friction Surfaces
20-05/Topic 14-09 Energy Conservation in Transportation
20-05/Topic 14-11 Administration of Research, Development, and Implementation Activities in Highway Agencies
20-05/Topic 14-12 Highway Uses of Epoxy with Concrete
20-05/Topic 14-22 Distribution of Wheel Loads on Highway Bridges
20-05/Topic 15-01 Toll Highway Financing
20-05/Topic 15-02 Durability of Prestressed Concrete Highway Structures
20-05/Topic 15-03 Detecting Defects and Deterioration in Highway Structures
20-05/Topic 15-04 Equipment for Obtaining Pavement Condition and Traffic Loading Data
20-05/Topic 15-05 Effects of Illegal Permit and Illegal Overloads on Pavement
20-05/Topic 15-06 Methods for Identifying Hazardous Highway Elements
20-05/Topic 15-07 Life-Cycle Cost Analysis of Pavements
20-05/Topic 15-08 Professional Resource Management and Forecasting
20-05/Topic 15-09 Protective Coatings for Bridge Steel
20-05/Topic 15-10 Prefabricated Bridge Elements and Systems
20-05/Topic 15-11 Traffic Data Collection and Analysis: Methods and Procedures
20-05/Topic 15-19 Cost-Effectiveness of Hot-Dip Galvanizing for Exposed Steel
20-05/Topic 16-02 Use of Weigh-in-Motion Systems for Data Collection and Enforcement
20-05/Topic 16-03 Maintenance Management of Street and Highway Signs
20-05/Topic 16-05 Freezing and Thawing Resistance of High-Strength Concrete
20-05/Topic 16-06 Wet-Pavement Safety Programs
20-05/Topic 16-07 Use of Fly Ash in Concrete
20-05/Topic 16-09 Managing Urban Freeway Maintenance
20-05/Topic 16-10 Bridge Deck Joints
20-05/Topic 17-01 System-Wide Safety Improvements: An Approach To Safety Consistency
20-05/Topic 17-02 Integrated Highway Information Systems
20-05/Topic 17-05 Design, Construction, and Maintenance of PCC Pavement Joints
20-05/Topic 17-06 Recycling Portland Cement Concrete Pavements
20-05/Topic 17-08 D-Cracking Of Concrete Pavements
20-05/Topic 17-09 Breaking/Cracking and Seating Concrete Pavements
20-05/Topic 17-10 Pavement Management Practices
20-05/Topic 17-11 Pedestrians and Traffic Control Measures
20-05/Topic 17-13 Staffing Considerations in Construction Engineering Management
20-05/Topic 18-01 Use of Consultants for Construction Engineering Inspection
20-05/Topic 18-02 Innovative Strategies for Upgrading of Personnel by State Transportation Departments
20-05/Topic 18-03 Design and Construction of Bridge Approaches
20-05/Topic 18-04 Treatment of Problem Foundations for Highway Embankments
20-05/Topic 18-05 Negotiating And Contracting For Professional Engineering Services
20-05/Topic 18-06 Pavement Markings: Materials and Application for Extended Service Life
20-05/Topic 18-07 Freeway Corridor Management
20-05/Topic 18-08 Freeway Incident Management
20-05/Topic 18-09 Cold-Recycled Bituminous Concrete Using Bituminous Materials
20-05/Topic 18-10 Contract Management Systems
20-05/Topic 18-11 Evolution and Benefits of Preventive Maintenance Strategies
20-05/Topic 18-12 Indicators of Quality in Maintenance
20-05/Topic 19-01 Computer-Aided Design and Drafting Systems
20-05/Topic 19-02 Uniformity Efforts in Oversize/Overweight Permits
20-05/Topic 19-03 Signal Timing Improvement Practices
20-05/Topic 19-04 Compaction of Asphalt Pavement
20-05/Topic 19-06 Process for Recapitalizing Highway Transportation Systems
20-05/Topic 19-07 Freeway Guide Sign Replacement: Policies and Criteria
20-05/Topic 19-08 Technology Transfer in Selected Highway Agencies
20-05/Topic 19-09 Moisture Damage in Asphalt Concrete
20-05/Topic 19-10 Transportation Telecommunications
20-05/Topic 19-12 Measurements, Specifications, and Achievement of Smoothness for Pavement Construction
20-05/Topic 19-23 Partnerships for Innovation: Private-Sector Contributions to Innovation in the Highway Industry
20-05/Topic 20-01 Fabrics in Asphalt Overlays and Pavement Maintenance
20-05/Topic 20-02 Measures to Curtail State Fuel Tax Evasion
20-05/Topic 20-03 Signing Policies, Procedures, Practices, and Fees for Logo and Tourist-Oriented Directional Signing
20-05/Topic 20-05 Short-Term Responsive Maintenance Systems
20-05/Topic 20-07 Removing Concrete from Bridges
20-05/Topic 20-08 Traffic Signal Control Equipment: State of the Art
20-05/Topic 20-09 Bridge Paint: Removal, Containment, and Disposal
20-05/Topic 20-11 In-Service Experience with Traffic Noise Barriers
20-05/Topic 20-12 Latex-Modified Concretes and Mortars
20-05/Topic 20-22 Managing Highway Tort Liability
20-05/Topic 21-01 Performance Characteristics of Open-Graded Friction Courses
20-05/Topic 21-02 Preferential Lane Treatments for High-Occupancy Vehicles
20-05/Topic 21-03 Management Training and Development Programs
20-05/Topic 21-08 Development and Implementation of Traffic Control Plans for Highway Work Zones
20-05/Topic 21-09 Supplemental Advance Warning Devices
20-05/Topic 21-10 Hot In-Place Recycling of Asphalt Concrete
20-05/Topic 21-11 Highway Maintenance Procedures Dealing with Hazardous Material Incidents
20-05/Topic 21-12 Truck Escape Ramps
20-05/Topic 21-13 Pavement Structural Design Practices
20-05/Topic 21-14 Criteria for Qualifying Contractors for Bidding Purposes
20-05/Topic 22-01 Performance and Operational Experience of Truck-Mounted Attenuators
20-05/Topic 22-02 Uses of Recycled Rubber Tires in Highways
20-05/Topic 22-04 Underwater Bridge Maintenance and Repair
20-05/Topic 22-07 Current Practices in Determining Pavement Condition
20-05/Topic 22-08 Disposal of Roadside Litter Mixtures
20-05/Topic 22-09 Knowledge-Based Expert Systems in Transportation
20-05/Topic 22-10 Recycling and Use of Waste Materials and By-Products in Highway Construction
20-05/Topic 22-11 Photographic Enforcement of Traffic Laws
20-05/Topic 22-12 Truck Operating Characteristics
20-05/Topic 22-13 Use of Rumble Strips to Enhance Safety
20-05/Topic 23-01 Accident Data Quality
20-05/Topic 23-02 Rapid Test Methods for Asphalt Concrete and Portland Cement Concrete
20-05/Topic 23-03 Managing Roadway Snow and Ice Control Operations
20-05/Topic 23-04 Multimodal Evaluation in Passenger Transportation
20-05/Topic 23-05 Performance-Related Specifications for Highway Construction and Rehabilitation
20-05/Topic 23-06 Corridor Preservation
20-05/Topic 23-07 Use of Warranties in Road Construction
20-05/Topic 23-09 Severity Indices of Roadside Features
20-05/Topic 23-10 Portland Cement Concrete Resurfacing
20-05/Topic 23-11 Changeable Message Signs
20-05/Topic 23-12 Reduced Visibility Due to Fog on the Highway
20-05/Topic 23-13 Effective Use of Park-and-Ride Facilities
20-05/Topic 24-01 Resolution of Disputes to Avoid Construction Claims
20-05/Topic 24-02 Road Pricing for Congestion Management: A Survey of International Practice
20-05/Topic 24-03 Performance and Operational Experience of Crash Cushions
20-05/Topic 24-04 Determination of Contract Time for Highway Construction Projects
20-05/Topic 24-05 Pavement Management Methodologies to Select Projects and Recommend Preservation Treatments
20-05/Topic 24-06 Electronic Toll and Traffic Management (ETTM) Systems
20-05/Topic 24-08 Longitudinal Occupancy of Controlled Access Right-of-Way by Utilities
20-05/Topic 24-11 Implementation of Technology From Abroad
20-05/Topic 24-12 Sealers for Portland Cement Concrete Highway Facilities
20-05/Topic 24-13 Assessing the Effects of Highway-Widening Improvements on Urban and Suburban Areas
20-05/Topic 25-01 Applications of 3-D and 4-D Visualization Technology in Transportation
20-05/Topic 25-02 Freight Transportation Planning Practices in the Public Sector
20-05/Topic 25-03 Left-Turn Treatments at Intersections
20-05/Topic 25-04 Guardrail and Median Barrier Crashworthiness
20-05/Topic 25-06 Collecting and Managing Cost Data for Bridge Management Systems
20-05/Topic 25-07 Pavement Subsurface Drainage Systems
20-05/Topic 25-09 Waterproofing Membranes for Concrete Bridge Decks
20-05/Topic 25-10 Cost-Effective Preventive Pavement Maintenance (Photocopy Edition)
20-05/Topic 25-11 Toll Plaza Design
20-05/Topic 25-12 Management of Surface Transportation Systems
20-05/Topic 25-13 Consideration of the 15 Factors in the Metropolitan Planning Process
20-05/Topic 25-14 Managing Contract Research Programs
20-05/Topic 25-15 Performance Measurement in State Departments of Transportation
20-05/Topic 25-16 Dynamic Effects of Pile Installations on Adjacent Structures
20-05/Topic 25-21 Service Life of Drainage Pipe
20-05/Topic 26-01 Remediation of Petroleum-Contaminated Soils
20-05/Topic 26-02 Variability in Highway Pavement Construction
20-05/Topic 26-03 Methods for Household Travel Surveys
20-05/Topic 26-04 Highway-Rail Grade Crossing Surfaces
20-05/Topic 26-05 Relationship Between Pavement Surface Texture and Highway Traffic Noise
20-05/Topic 26-06 Land Development Regulations that Promote Access Management
20-05/Topic 26-07 Application of Full-Scale Accelerated Pavement Testing
20-05/Topic 26-08 Ground Penetrating Radar for Evaluating Subsurface Conditions for Transportation Facilities
20-05/Topic 26-09 Evaluating and Measuring the Effectiveness of Training
20-05/Topic 26-10 Settlement of Bridge Approaches (The Bump at the End of the Bridge)
20-05/Topic 26-11 Transportation Development Process
20-05/Topic 26-12 Maintenance Issues and Alternate Corrosion Protection Methods for Exposed Bridge Steel
20-05/Topic 27-01 Trenchless Installation of Conduits Beneath Roadways
20-05/Topic 27-02 Criteria for Highway Routing of Hazardous Materials
20-05/Topic 27-03 Stabilization of Existing Subgrades to Improve Constructibility During Interstate Pavement Reconstruction
20-05/Topic 27-04 Methods for Increasing Live Load Capacity of Existing Highway Bridges
20-05/Topic 27-05 State DOT Management Techniques for Materials and Construction Acceptance
20-05/Topic 27-06 Outsourcing of State Highway Facilities and Services
20-05/Topic 27-07 Managing Product Liability to Achieve Highway Innovations
20-05/Topic 27-08 Thin-Surfaced Pavements
20-05/Topic 27-09 Methods for Capital Programming and Projection Selection
20-05/Topic 27-10 Response of Small Urbanized Area MPOs to ISTEA
20-05/Topic 27-11 Traffic Signal Control Systems Maintenance Management Practices
20-05/Topic 27-12 Road User and Mitigation Costs in Highway Pavement Projects
20-05/Topic 27-16 Applications of GPS for Surveying and Other Positioning Needs in Departments of Transportation
20-05/Topic 28-01 Best Management Practices for Environmental Issues Related to Highway and Street Maintenance
20-05/Topic 28-02 Geotechnical Related Development and Implementation of Load and Resistance Factor Design (LRFD) Methods
20-05/Topic 28-03 Project Development Methodologies for Reconstruction of Urban Freeways and Expressways
20-05/Topic 28-04 Lead-Based Paint Removal for Steel Highway Bridges
20-05/Topic 28-05 Dynamic Impact Factors for Bridges
20-05/Topic 28-06 Methods to Achieve Rut-Resistant Durable Pavements
20-05/Topic 28-07 Submittal of Bid Proposals in Electronic Format
20-05/Topic 28-08 Historic Highway Bridge Preservation Practices
20-05/Topic 28-09 Modern Roundabout Practice in the United States
20-05/Topic 28-10 Transportation Management Center Functions
20-05/Topic 28-11 Tolling Practices for Highway Facilities
20-05/Topic 28-12 Traffic Signal Operations Near Highway-Rail Grade Crossings
20-05/Topic 29-01 Seven Keys to Building a Robust Research Program
20-05/Topic 29-02 Roadway Incident Diversion Practices
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 280: Seven Keys to Building a Robust Research Program identifies attributes necessary to build and maintain a robust research program. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=3279
20-05/Topic 29-03 Performance Survey on Open-Graded Friction Course Mixes
This synthesis report will be of interest to officials of municipal, regional, and statewide transportation and law enforcement agencies who are responsible for roadway incident diversion practices. It will also be of interest to others who interact with these agencies to achieve a better understanding of the processes, barriers, and technologies associated with alternate route plan development and deployment. This report presents state-of-the-practice information about the development and implementation of roadway incident diversion practices. It documents specific trends in the practice, and in examining individual practices, identifies unique plans, processes, and technologies from which other agencies may find useful applications. This TRB report addresses a broad list of topics associated with roadway incident diversion and profiles successful incident diversion practices, as reported by surveyed agencies. In particular, it focuses concern on alternate route plans for random incidents, those resulting in nonrecurring congestion. The report for this topic can be purchased at http://www.trb.org/news/blurb_detail.asp?id=3280
20-05/Topic 29-04 Project Management Information Systems
This synthesis will be of interest to pavement construction, maintenance, design, and materials engineers; pavement contractors; and others interested in the use of open-graded friction course (OGFC) mixes. It describes the current state of the practice on the use of OGFC mixes, including information regarding design, materials, construction, maintenance, and rehabilitation strategies. Alternative treatments to traditional OGFC are also identified and discussed. Information was collected by surveying U.S. and Canadian transportation agencies and by conducting a literature search to gather additional insight into North American and European practices. This TRB report describes the recent performance of North American OGFC mixes and European porous asphalt by identifying benefits and stress indicators. A new generation of OGFC mixes has evolved over the last 5 years with changes that have been reported to dramatically improve performance. This synthesis describes new materials and design methods being used, as well as the applicability of the new generation of open-graded mixtures to North American use. Th report for this topic can be purchased at http://www.trb.org/news/blurb_detail.asp?id=3275
20-05/Topic 29-05 Impact of Narrow Median Widths on Commercial Vehicles
This synthesis report will be of interest to DOT chief administrative and information officers, information technology staff, and project managers and their supervisors. It describes the current state of the practice for DOT project management information systems, as well as current best practices across other industries. Several case studies and an appendix chapter on change: definition and implementation, role of personnel, processes, and cost are also provided. This TRB report describes the processes used to develop and implement automated project management information systems, the sources of software in use, and the extent of any modifications necessary for commercial projects to fit DOT business needs. It also describes the operating environments for systems in use and the capabilities and limitations of the systems used to track multiple projects and information sources. In addition, information on system capabilities and deficiencies in project communications, report and problem solving, the necessary resources required to implement and maintain each automated system, the length of time each system has been in place, and future plans for long-term enhancement, modifications, or enhancements is included. The report for this topic can be purchased at http://www.trb.org/news/blurb_detail.asp?id=3277
20-05/Topic 29-06 Consultants for DOT Preconstruction Engineering Work
Divided roadways separated by narrow medians in urban, rural, and suburban areas can impact traffic operations and safety. This synthesis will: locate and document available literature, resources, and practical experience that median width has on the operation of larger vehicles; identify and report on specific traffic operation and safety concerns (e.g., left turns, U-turns, sight distance, storage needs, and increased vehicle size); and summarize the reported effectiveness of the various methods, techniques, and strategies (e.g., design criteria, routing, intersection control, access management, land use planning, and local ordinances) used to address the identified concerns. To the extent possible, international experience will be sought. The final report will be published as NCHRP Synthesis 281
20-05/Topic 29-07 Management and Selection Systems for Highway Maintenance Equipment
Many state DOTs and local transportation agencies are increasing the percentage of design work done by outside consultants forces. The reasons for using consultants to perform design work are varied, but it is often a result of increased public/legislative pressure to downsize government at the same time the design workload is increasing. Design work encompasses all pre-construction activities. This synthesis will report on the state-of-the-practice regarding the use of consultant forces for DOT design work. Synthesis 137 will be consulted for background information. The synthesis has been published.
20-05/Topic 29-08 Measuring In-situ Mechanical Properites of Pavement Subgrade Soils
In the mid-1970's, the TRB Committee on Maintenance Equipment recommended that a synthesis be prepared to collect the best equipment management practices from around the country. The results of that effort were published in NCHRP Synthesis 52, "Management and Selection Systems for Highway Maintenance Equipment" (1978). The information has become dated due to changes in practice and advancements in information technology. Therefore, this synthesis will be an update of Synthesis 52. This update of Synthesis 52 will include items and issues covered in the existing document. This synthesis will be based on information from a literature search and review and a survey of North American practice. A more limited survey and search of international operations, as well as particularly innovative commercial practices are also required. Case studies to document specific examples of successful practice are to be included. These may include examples of similar concerns shared by other modal fleet managers. The synthesis is in the publishing phase and should print in late April or early May.
20-05/Topic 30-01 Systems Engineering Processes for Developing Traffic Signal Systems
This synthesis will provide an overview of the current and emerging methods to measure the in-situ mechanical properties of subgrade soils for highway pavements. "Mechanical properties" will encompass engineering properties related to resilient modulus, modulus of subgrade reaction, shear strength, and other stiffness measures. The synthesis will include, but not be limited to identifying: existing and emerging methods for measuring in-situ soil subgrade mechanical properties; relationships between in-situ soil subgrade and laboratory mechanical properties; environmental effects on in-situ soil subgrade mechanical properties; effect of existing pavement layers on the measurement of subgrade properties; the use of the measured soil subgrade mechanical properties in pavement design/evaluation procedures, including case studies; and new applications or improvements to existing in-situ soil test methodology to support the use of mechanistic/stochastic-based pavement design procedures. The synthesis has been published.
20-05/Topic 30-02 Multimodal Aspects of Statewide Transportation Planning
This synthesis summarizes systems engineering processes and methodologies, including those which have been developed and used by transportation agencies. It reports on the traffic engineering community's experience with various systems engineering approaches. Major aspects of the synthesis study include a definition of systems engineering and identification of the general processes, steps, and methodologies commonly used in the industry and relation of these processes to traffic signal ystems. The document has been published.
20-05/Topic 30-03 Corridor Management
This synthesis will document the state of the practice, examples of successful practice, and key research needs for the multimodal aspects of statewide transportation planning. This will include information on the evaluation processes and criteria used, implementation, identification of stakeholders and their involvement in multimodal planning and decision making, and how states have successfully dealt with multimodal planning issues associated with modes that they do not own or operate. In addition, information on innovative data collection and analytical methods, how multimodal planning has balanced capital and operating needs, how statewide multimodal plans are affecting programming and budgeting decisions, and how and to what extent are the multimodal aspects of statewide and metropolitan/regional planning processes connected will be included. Finally, information on the greatest needs and impediments that states face in being able to do better statewide multimodal planning will be sought. The synthesis was published in August 2000.
20-05/Topic 30-04 Innovative Practices to Reduce Delivery Time for Right-of-Way in Project Development
Federal and state transportation agencies, MPOs, local governments, and other organizations are placing an increased emphasis on corridor management. Corridor management responds to the need to enhance the safety and performance of transportation corridors using planning, public policy, programs, and partnerships. It addresses both multimodal transportation and land use issues. This synthesis will identify and discuss the many definitions and approaches (including the tools and techniques) used to implement corridor management at the state, regional, and local level. Case studies on the use of multiple techniques to accomplish corridor management are required. Conclusions on their application will also be included. The synthesis was published in October 2000.
20-05/Topic 30-05 Current Practices for Assessing Economic Development Impacts from Transportation Investments
In anticipation of highway construction projects, some state DOTs are incorporating innovative management-based actions in their activities. This is being done in an effort to reduce total project time typically associated with project development, including the acquisition and clearance of Right-of Way (ROW). There is a need to alert state DOT officials and staff to the necessity of responsible overall project management, emphasizing those problems associated with the delivery of ROW. This synthesis of current practice will study successful experiences in project development, including innovative solutions. Successful state practices will be profiled and information presented. The synthesis was published in December 2000.
20-05/Topic 30-06 Sleep Deprivation Countermeasures for Motorist Safety
State DOTs and MPOs have need to measure the economic development impacts from transportation investments. To meet this need, many approaches are available. This synthesis of existing practice will summarize available research and studies on economic development impacts form transportation investments, and the techniques that states and MPOs use and the rationale for conducting the analysis. The synthesis was published in October 2000.
20-05/Topic 30-07 Data Sharing and Data Partnerships for Highways
The synthesis shall provide background information and report on the types of drowsy-driving countermeasures in use by state DOTs and others (e.g., ATA, AAA, CVSA). This will include countermeasures to ensure that drivers do not operate vehicles in fatigued state, as well as countermeasures designed to detect and counteract drowsy driving when it does occur. The reported effectiveness, advantages/disadvantages, and prevalence of each identified countermeasure will be documented. Information on devices under research and in development will be discussed, including estimates of availability. The synthesis was published in July 2000.
20-05/Topic 30-08 Bridge Deck Joint Performance
The Federal Highway Administration (FHWA), in cooperation with the American Association of State Highway and Transportation Officials (AASHTO) and the Association of Metropolitan Planning Organizations (AMPO), is conducting a strategic reassessment of the Highway Performance Monitoring System (HPMSO). This synthesis will document current arrangements among state DOTs, MPOs, and regional and local agencies to collect and share data. The key elements to be surveyed include institutional (contractual and administrative) arrangements, use of data, data sharing, cost and resource requirements, technical capabilities/barriers, implementation processes, data quality and compatibility, as well as successes, failures, and difficulties. It is anticipated that a number of case studies of successful partnerships will be identified and documented in detail. The synthesis was published in October 2000.
20-05/Topic 30-09 Quality Assurance of Structural Material
Bridge deck movement (e.g., expansion) joints used in the United States consist of wide variety of materials, designs, and construction methods. This synthesis will collect information on their use and report on the performance of the more commonly used bridge deck joint materials and systems. State of the art information on large joints (movement range 6 inches or greater, including modular), international practice, examples of effective agency standard design details and specifications, and a glossary of terms will also be included. The initial Consultant resigned and a new consultant is on board. The new Consultant contract began on April 1, 2001. Panel and 20-5 comments were received on the second draft, and the consultant submitted the final draft on December 17, 2002. The consultant provided response to these on 4/22/03. After extensive revision by staff, these responses and the final document were submitted for SNO review on June. Published 8/29/03.
20-05/Topic 30-10 Maintenance of Highway Edgedrains
Improved quality assurance (QA) strategies are needed by state DOTs to enhance their ability to ensure cost effective, high quality bridges and structures. This synthesis will report on the experiences of transportation agencies and other construction industries, both foreign and domestic, in the application of quality assurance strategies for conventional and high performance structural materials in highway structures. It will identify QA strategies proven effective for structures and materials, as well as those that are not effective. In addition, it will provide information to states initiating or revising quality programs for their critical structural components. This information includes state processes for quality assurance and contractor processes for quality control on new and retrofit construction, using conventional and/or innovative materials. A new consultant was employed to complete a second draft. This was delivered April 24,2002, and, after review, was forwarded to the panel and 20-5 Committee for final review on May 5, 2002. The 20-5 and committee comments were overnighted to the consultant on August 1, 2002, with a due date of August 21 for the final revised draft. Consultant promised delivery by 10/02, 10/15, 12/11, and 12/29. The consultant has not provided the revised final draft. Because the material in this synthesis has become outdated, it is recommended that the highlights of the contents be published as a Research Results Digest. RRD 274 has been published, 9/3/03.
20-05/Topic 30-11 Evaluation of Pavement Friction Characteristics
Effective removal of water from pavement systems has been proven to help achieve pavement service life. Maintenance of edgedrains is therefore important at the outlets and within. The primary purpose of this synthesis is to identify practices and procedures for maintaining the edgedrain system (I.e., outlet, headwall, connection, and longitudinal pipe). A secondary purpose of the synthesis is to identify design and construction procedures that will reduce and facilitate the maintenance of edgedrains. The synthesis was published in July 2000.
20-05/Topic 30-12 Reducing and Mitigating the Impacts of Lane Occupancy During Construction and Maintenance
This synthesis will collect information and report on the issues pertaining to pavement friction characteristics, including aggregate and mix design properties, methods of testing and monitoring, and evaluation of pavement friction properties after construction or rehabilitation. A literature search of domestic and international sources and a survey of state and provincial transportation agencies will be conducted. From international sources, information on the International Friction Index is of particular interest. The synthesis was published in December 2000.
20-05/Topic 31-01 A Review of Recent Geometric Design Research for Improved Safety and Operations
Construction and maintenance operations inevitably require work forces to occupy the roadway. With travel demand at or near congestion levels, methods of limiting the time on the road are being applied internationally. These methods include preconstruction and construction processes for minimizing lane occupancy in order to mitigate impacts on the public. This synthesis will address the techniques for reducing lane occupancy as a method for achieving this objective. Background information will be provided with regard to program and policy-related decision-making, design and contractual issues, economic impacts, and the consideration given to regional traffic systems within which the projects are addressed. Specific information regarding lane occupancy will also be addressed. The synthesis was published in December 2000.
20-05/Topic 31-02 Statistical Methods in Highway Safety Analysis
During the last decade, there has been considerable research on all aspects of geometric design affecting how roadways are designed, how they operate, and ultimately, the safety of these facilities. This synthesis will critically review and selectively summarize the geometric design research since 1990, particularly research with safety and operational implications. It will be directed toward national, state, and local geometric design policy-makers and mid-level managers. Areas to be addressed include, but are not limited to the following: design speed, controls and criteria (e.g., definitions, vehicles, users), horizontal alignment, vertical alignment, cross section (i.e., right-of-way to right-of-way), intersections, interchanges, access management, and design consistency. The synthesis has been published.
20-05/Topic 31-03 Assesment and Rehabilitation of Existing Culverts
Over the last decade, significant progress has been made in establishing statistical relationships between vehicle crashes and key driver, engineering, and environmental factors; in assessing the safety effect of certain engineering measures; and in identifying potential crash locations. This synthesis effort will survey the literature, state and federal transportation agencies, universities, and other research agencies in order to document the current state of the practice, including, but not limited to the following: traditional and new methods for data management and analysis used by highway safety analysts and researchers; potential limitations of these methods; methods for overcoming limitations affecting transportation safety related research and decision-making previously identified; use of “off-the-shelf,” proprietary, or user developed software; identify the knowledge, training, and skills necessary to improve the state-of-the-practice; and identify future research and development needs. The synthesis was published in October 2001.
20-05/Topic 31-04 Performance Measures for Research, Development and Technology Programs
The condition of buried culverts and storm sewers (pipes) is an item of concern to DOT, county, and municipal engineers. It is often necessary for engineers to require that pipe condition be assessed and that consideration be given to rehabilitation or replacement. This synthesis will locate and document methods currently being used in the US and internationally to assess pipe condition and select appropriate repair methods. Rehabilitation methods will be documented, including case histories where structures have been reconditioned. Temporary and permanent solutions for structural stabilization are of interest, including the immediate problem of maintaining traffic while repairing the pipe. This study will include plastic, concrete, and metal pipes, along with system appurtenances such as drainage inlets, manholes, junction boxes, and headwalls. The study will not include cast-in-place structures or those defined as bridge structures. The final panel and 20-5 Committee review comments were received, and the consultant submitted his final revised draft on May 10, 2002. SNO approval was received on Sept 20, 2002, and the draft has been submitted for publication
20-05/Topic 31-05 Collecting, Processing, and Integrating GPS Data into GIS
This synthesis will survey current national and international uses of performance measures for evaluating the effectiveness and impact on transportation RD&T programs. The synthesis will include a literature review and a survey of practice. Sources of information will include, but not be limited to state DOTs, the US DOT, and university and private sector measures relevant to transportation RD&T programs. The synthesis will identify: the various kinds of performance measurements being used, how they are developed, how effective the measures are in evaluating individual RD&T transportation programs, the commonality of measures across various programs, and best practices. The synthesis is scheduled for publication on 1/10/02.
20-05/Topic 31-06 Facilitating Partnerships in Transportation Research
The purpose of the synthesis is to summarize and collate existing information, data and algorithms on the state of the practice activities related to the collection of global positioning system (GPS) data, data smoothing and map matching. The focus of the synthesis is the use of kinematic GPS data and its integration into a geographic information system (GIS). Examples of kinematic applications include speed surveys, travel surveys and fleet monitoring analysis. The synthesis report will include information on existing standards, protocols, and new developments in positioning, including cellular technology. The synthesis final draft has been reviewed by the 20-5 committee, revised by the consultant and has been prepared for publication. SNO approval received, and publication of #301 completed.
20-05/Topic 31-07 Long-term Pavement Marking Practices
This synthesis will present examples of successful external and internal research partnerships between all sectors that can be used for transportation research. Items of interest include, but are not limited to, guidelines (e.g., check lists, MOUs), technologies (e.g., communications), and mechanisms (e.g., legislation, institutional and funding arrangements) for implementation. Issues such as patent rights for new products or processes, residual interests/intellectual property rights and other possible conduits for successful implementation of results are also of interest. In addition, strategies for addressing barriers to successful partnerships will be presented. 20-5 review is complete. Submitted for SNO approval on 11/27, and for publication on 12/31/2002. Published May 15, 2003.
20-05/Topic 31-08 Impact of New Information/Communications Technology on Transportation Agencies
This synthesis will document pavement marking practices in the U.S., Canada, and Europe. Other relevant locations will also be considered. This will be done for long-term applications. The synthesis will highlight current and best practices as reported by transportation agencies and help identify future developments of pavement marking systems. How these practices relate to the MUTCD will also be documented. To be published Jan. 9, 2003.
20-05/Topic 31-09 Truck Trip Generation Guide
It is of interest to know what factors enable transportation agencies to respond to the evolution of information and communication technologies. This synthesis will review key literature sources and survey state transportation agencies to collect information on agency experience. This will include, but will not be limited to the following: descriptions of the information and communications technology components of agency strategic plans, what changes in organizational structure have or will occur due to implementation of the information and communications technologies, how the information and communications technologies are being managed, what type and kind of technologies are being used, what resources are being dedicated to the implementation and operation of these technologies, including prioritization and allocation, and what has been done to make technology innovation part of the agency culture. The document was published in August 2001.
20-05/Topic 31-10 Configuration Management in Transportation Management Systems
This synthesis will identify available truck trip generation data. Trip rates associated with economic activities and land uses are of particular interest. Information will include, but not be limited to, the following: office/service (e.g., office campuses, CBDs), retail (e.g., “big box,” mixed use, and malls), industrial (e.g., light, heavy, and high tech), reload/transload centers (e.g., ports, warehouses/distribution centers, rail terminals, airports), for-hire truck facilities (e.g., LTL, TL, specialized, truck stops), integrated express carrier sorting facilities and post offices, waste collection, mining, construction-related activities, and special generators (e.g., convention centers, sports facilities). The validity of the data, collection methods and challenges, and the organizational sources and attitudes toward sharing data will also be addressed. State planning entities and selected MPOs and local jurisdictions will be contacted for information. Private sector, academic, and other sources will also be contacted to obtain truck trip generation rate data. Studies conducted within the last decade are of specific interest. The synthesiswas published in December 2001.
20-05/Topic 31-11 Building Effective Relationships Between States, Cities and the Federal Government
Configuration management (CM) is a necessary process in the planning, design, implementation, integration, and operation of traffic control systems. This synthesis will summarize the field of literature and survey transportation agencies that have developed and used CM and CM plans. It will report on the scope of issues included in agency plans, profile successful agency procedures, and identify additional information (e.g., potential further study, training, technical guidance) needed by transportation agencies to facilitate the successful use of CM. The synthesis has been published.
20-05/Topic 31-12 Mitigation of Ecological Impacts
Central cities depend on funding and support from both the state and Federal government. The ability for central city officials to participate in regional, state, and federal transportation planning, regulatory, and policy decisions varies greatly. City officials desire increased participation, recognition of local context, and cooperative efforts. This synthesis will document various relationships and constructs between large central cities, MPOs, states, the federal government, and other entities to identify practices proven successful in furthering the capital, operations, and maintenance needs of their transportation systems. These cities were previously identified in “Transportation Issues in Large U.S. Cities,” TRB Conference Proceedings 18. The synthesis is in the final stage of the publication process.
20-05/Topic 32-01 Dealing With Truck Parking Demands
This synthesis documents the current practices of transportation agencies as they implement ecological mitigation measures for highway projects as they apply to aquatic wetland, and riparian habitats. It summarizes available information on the types of ecological impacts incurred by highway projects and the methodologies used to assess these impacts, procedures for determining the need for mitigation and monitoring, types of mitigation implemented for different impacts and how mitigated sites are monitored, methodologies for the evaluation of mitigation success or failure, and the costs of mitigation. The synthesis document has been published.
20-05/Topic 32-02 Stategies for Managing Increasing Truck Traffic
It is nationally recognized that commercial motor vehicle operators frequently can not find adequate, safe parking for rest purposes. Because of the parking shortages and limits on stays in public facilities, truck drivers may be creating unsafe situations by parking on roadway access ramps and shoulders to obtain adequate rest. This synthesis will survey state DOTs, other public and private stakeholders, and existing literature to determine what states are doing to address the problem of limited public and private truck rest facilities. Detailed case studies will be developed to offer additional insight. The Consultant delivered the synthesis first draft. As it was in very good order, the panel voted to conduct its review by mail, without a second panel meeting. Panel comments have been transmitted to the consultant, and the second draft was received in mid-September. 20-5 and panel comments were sent to the consultant on Dec. 31, 2002. A revised final draft was received in February 2003, and was forwarded for SNO review on March 7, 2003. The report is in production.
20-05/Topic 32-03 Impact of Red Light Camera Enforcement on Crash Experience
Many states are seeing significant increases in the number of trucks on their roadways. Truck traffic poses many challenges for state Departments of Transportation (DOTs), Metropolitan Planning Organizations (MPOs), and other transportation organizations. Many states are developing strategies for addressing the associated challenges . This synthesis, based on surveys of state DOTs, a limited number of MPOs and other transportation agencies, and the literature, will identify strategies that are in use or being proposed for managing increased truck traffic. The final document has been printed.
20-05/Topic 32-04 Significant Findings from Full-scale/Accelerated Pavement Testing
This synthesis will collect and document information from local, state, and federal agencies; international sources; and others regarding crash experience at intersections with red light camera installations. Also of interest are the area wide safety effects of red light cameras. The synthesis will include information on possible changes in crashes, crash type, and severity. Reported practices for measuring changes in crashes associated with red light camera enforcement will be documented so that readers of the synthesis can understand the methods employed and any benefits derived. SNO approval has been received. The synthesis has been published.
20-05/Topic 32-05 Driveway Regulation Practices
Full-scale/accelerated pavement test (APT) programs have been conducted both nationally and internationally for more than 30 years. These programs have generated significant findings/benefits with regard to pavement design, analysis, evaluation and construction practices. The objective of this synthesis is to document and summarize the significant findings from the various experimental activities associated with full-scale/APTs. The focus will be on reported findings and on their application to research and practice, not on the details of the facilities and equipment. In addition to the synthesis of findings, actual and potential benefits to the U.S. pavement community will be addressed. The Consultant has submitted the synthesis first draft. The panel reviewed this and provided extensive comments at their second meeting on March 15, 2002. Second draft was received October 30, 2002. For a synthesis, it is a very large, comprehensive document. It was submitted to the 20-5 committee for review on 12/20/02, as the first synthesis to be web-reviewed by the oversight panel. 20-5 and panel comments were sent to the consultant on March 3, 2003. The final draft was delivered in mid-August. Editing is complete, and SNO approval. Publication was in February n January 2004.
20-05/Topic 32-06 Public Benefits of Highway System Maintenance and Operations
Driveway permitting practices vary widely from state to state. This synthesis will survey state departments of transportation, selected local agencies, and the literature to: summarize driveway-permitting practices for new development, re-development, and highway projects; document problems and benefits of permitting practices; summarize the impacts of driveway permitting practices on safety, operations, maintenance, land use, businesses, and land value; identify obstacles impeding improvements (e.g., legal issues) to driveway permitting practices and actions to overcome them; and summarize lessons learned. The final document has been published.
20-05/Topic 32-07 Performance Measures of Operational Effectiveness for Highway Segments and Systems
This synthesis will collect information on and document the practices that agencies use to measure and articulate the benefits of highway system maintenance and operations. This will include the benefits of system preservation and the impacts of deferred maintenance. Of particular interest are the methods used by agencies to effectively communicate the benefits of system maintenance and operations with those in the political process and the general public. The Consultant submitted the first draft in March 2002, and a 2nd panel meeting was held June 17, 2002 to review the draft. The panel provided extensive comments and guidance for revising the draft. The second draft was received October 31, 2002. It was returned to the consultant by staff for more work. The revised second draft has been received and reviewed by the panel and 20-5 committee. Comments have been forwarded to the consultant. Final draft received 12/25/03 and forwarded to editing. SNO approval has been received and publication is expected by August 1, 2004.
20-05/Topic 32-08 Cost Effective Structures for Off-system Bridges
This synthesis will summarize the practices used by state transportation departments, several metropolitan planning organizations, and a few cities and counties concerning highway operation performance measures and associated data collection (e.g., link travel times, duration of congestion, reliability, LOS, seasonal road closures, recurring and non-recurring delays). How they are collected and put to use, their relative strengths, weaknesses, and the usefulness of these measures for various audiences and purposes will be documented. Successful practices will also be highlighted using agency profiles. The synthesis is in publication.
20-05/Topic 32-09 Transportation Planning and Management for Special Events
There is a nationwide need to encourage counties and cities to improve the overall sufficiency rating of their structure population. A synthesis of the existing practices and processes used to satisfy reasonable operating standards for off-system bridge and approach roadways is needed. The synthesis will survey state Departments of Transportation (DOTs), local agencies, and the literature to document the practices that lead to the most economical, safe and functional, off-system bridges. These bridges are defined as those under local jurisdiction. The consultants delivered the first draft on June 24, 2002. A second panel meeting was held on August 5, 2002 to review the draft, and the panel requested extensive revisions. The second draft was delivered April 15. 20-5 and committee comments were sent to the consultant on 8/12. The final draft was delivered 11/3/04, and is in editing. Publication has been held up while the author responds to editorial queries. SNO approval has been received and publication is expected by August 15, 2004.
20-05/Topic 32-10 Compensation for Contractors Home Office Overhead
Special events are an important and frequent part of transportation system operations. They include sporting events, parades, national conventions, international summits, music festivals, fairs, or other planned events. To optimize the performance of the transportation system during special events, agencies plan and coordinate the delivery of transportation services and operations in advance. This synthesis will report the state of the practice of transportation planning and management of special events. Specifically, it will identify how agencies are planning, coordinating services, and managing the overall transportation system for these periods. The Consultant submitted the synthesis first draft. The panel decided that the draft is complete enough to be reviewed by mail. Panel comments were forwarded to the consultant, who delivered the second draft on April 5, 2002. 20-5 review and SNO review has been completed, and the report was published in March 2003.
20-05/Topic 32-11 Interaction Between Wildlife Ecology and Roadways
Contract change orders, contract delays and claims, and extra and force account work often cause transportation agencies to calculate additional amounts of compensation to be paid out for home office overhead (general and administrative, G&A). This synthesis will document how state departments of transportation (DOTs) are compensating contractors for unabsorbed home office overhead for contract delays. It will identify the methods and percentages currently being used and report on the advantages and disadvantages of each method of compensation. The Consultant submitted the synthesis first draft, and the second panel meeting was held April 5, 2002. The second draft was received in July 2002, and was submitted to 20-5 review in September 2002. 20-5 comments were received Dec. 2, 2002 and were forwarded to the consultant. The final draft was delivered and SNO approval was received March 19. p:ublished July 1, 2003..
20-05/Topic 32-12 Owner Controlled Insurance Programs
The development, operation, and maintenance of roadways can affect wildlife in every part of the country. These effects include a loss of wildlife habitat, fragmentation, mortality, and increased competition. Roadway development choices made in response to population growth can affect many, if not all, wildlife species. This synthesis will summarize existing information related to roadway planning, design, construction, and maintenance practices being used nationally and internationally, successfully and unsuccessfully, to accommodate wildlife ecology. The final draft was submitted to the 20-5 committee. The consultant addressed their comments in a revised final draft, which was approved by the SNO. The report was sent to publication on July 30, 2002, and published in November..
20-05/Topic 33-01 Design Exception Practices
Transportation construction projects involve many types of insurance coverage such as Workers’ Compensation, General Liability, Builder’s Risk, and Professional Liability, to name a few. One of the ways that owners are attempting to manage the risks is to engage in what are called Owner Controlled Insurance Programs (OCIPs) or "wrap-up" insurance coverage. This synthesis will provide owners with information regarding the history and use of OCIPs in the design and construction of transportation projects. It will document the literature and the practice from both the owner and contractor perspectives. The consultant submitted the synthesis first draft, and the panel elected to conduct by-mail review. The second draft was forwarded to the 20-5 committee and the consultant submitted a revised final draft. This was approved by the SNO, and was sent to publication on 9/11/02, and published at the end of the year. Copies have been sent to Jack Basso at AASHTO.
20-05/Topic 33-02 Precast Structural Elements for Bridge Construction
There is a wide range of effort associated with preparing and approving design exceptions. In part, this is due to various project types or funding classifications, differing state laws governing tort liability and design immunity, and state DOT organizational structure. This synthesis will identify the various practices used by states. It will review the literature and survey state departments of transportation in order to summarize design exception practices, document the problems and measured benefits reported by the states, summarize the lessons learned (e.g., the frequency and outcome of using design exceptions in court cases), and identify potential streamlining efforts in the design exception process, as reported by the states. The first draft has been received, and the second panel meeting held November 25, 2002. The second draft was delivered, reviewed by the panel and 20-5 committee and the consultant will deliver the revised final draft in early April 2003.
20-05/Topic 33-03 State Product Evaluation Programs
This synthesis study will summarize the literature and survey transportation agencies and others to document the use of prefabricated bridge components and systems that minimize traffic disruption in the work zone while maintaining construction quality. It will focus on rehabilitation and replacement of commonly used bridges using the "Get in, Get out, and Stay out" philosophy. The study will include information on benefits of minimal traffic disruption (e.g., safety); quality issues (e.g., durability, connections); constructability (e.g., design considerations -- component sizes and weights, transport, and erection); and costs (e.g., user, construction, maintenance). The first draft has been received, and the second panel meeting held Nov. 6, 2002. The second draft was delivered 2/27/03 and was forwarded for panel and 20-5 review. The final draft was received in June 2003, and has been been forwarded for editing and SNO approval. The report was printed in December 2003, and was reprinted, due to poor quality reproduction of the figures.
20-05/Topic 33-04 Integrated Roadside Vegetation Management
Product evaluation programs exist in many states and are operating at different levels, ranging from well-developed and effective programs to programs that are in the developmental stages and/or partially functional. This synthesis will summarize state DOT practices for product evaluation, including program structure, evaluation procedures, and the implementation of the evaluation process results. Items to be considered, include, but are not limited to: product evaluation program organization, funding and procedures; types of products evaluated; product acceptance criteria; acceptance options; and product-approval implementation. A consultant has been selected, the contracting and start-up processes are complete. The Stage I deliverables, the workplan, outline, and questionnaire, have been reviewed and approved. The consultant agreed that 33-03 would be a pilot for a web-based survey method (along with a hard-copy backup). The questionnaire was distributed to TRB reps on July 3, 2002. The second panel meeting to review the first draft was held Feb 7, 2003. Second draft was delivered in May 2003. 20-5 and panel comments have been sent to the consultant, and the final draft was delivered 10/27/03, and is in editing. Ediiting found Excel tables with corrupted data and it took the author some time to correct these. SNO approval was received 4/20/04. Publication is expected in August 1, 2004.
20-05/Topic 33-05 Safe and Quick Clearance of Traffic Incidents
Many states are beginning to consider vegetation management in project planning and design in order to achieve long-term sustainability. This synthesis collects information about this from the current literature and a survey of tate transportation agencies to document roadside vegetation management research and priorities. It includes information on policies and regulations, costs and benefits, methods of vegetation management, environmental impacts, implementation, revegetation, and effectiveness. The document has been published as NCHRP Synthesis 341.
20-05/Topic 33-06 Roadway Safety Tools for Local Agemcies
This synthesis study will review and document quick clearance legislation and responder policies and practices regarding incident clearance for both urban and rural areas. Responders include transportation and public safety agencies, towing and recovery companies, and other public and private concerns. Relevant research, including cost-benefit analyses, will also be reviewed. Key areas to be addressed include, but are not limited to: legislation that requires moving vehicles involved in minor crashes; liability and tort law related to moving vehicles, cargo, or debris; legislation to limit liability for damages that may occur during quick clearance; public information and driver education efforts; benefit analyses related to quick clearance activities; impact of financial responsibility on decision-making at the scene; scope of training for all involved in the clearance of highway incidents; and institutional and programmatic activities to support quick clearance. The stage 1 deliverables (work plan, outline, and questionnaire) were submitted and reviewed, and the questionnaire was distributed to TRB reps on June 7, 2002. The I-95 Corridor Coalition has a project (by PB Farradyne) on" Quick Clearance & Move It Best Practices." They approached TRB and requested that the two projects share information. The staff and the project panel were supportive, and Walter Dunn and PB Farradyne have been cooperating on this. The first draft was received and the panel reviewed it at their meeting of 12/11/02. The second draft was delivered in mid February, 2003, and was reviewed bythe 20-5 Committee. The final draft was delivered in April 2003 and was sent for editing and SNO approval. Printed 8/23/03.
20-05/Topic 33-07 Safety Management Systems
State DOTs and local agencies are responsible for carrying out a range of program development and delivery activities that advance the overall safety performance of the roadway system. This synthesis will document the literature and practices among state highway agencies and local governments, and expanded cooperation between them, to successfully plan and implement adequate safety countermeasures and programs. This will include but not be limited to: improvements to existing facilities and new roadway design; roadway safety audits; data collection policies, protocols, and processes; safety trade-offs; state and local government partnerships; examples of public safety and transportation agency cooperation and reporting; effective local work zone safety practices; training and communications; and gaps in resources and tools. The consultant delivered the first draft, and the panel review meeting was held January 30, 2003. The second draft was delivered, and fowarded for 20-5 review in mid-March 2003. The final draft was received in May 2003, and has SNO approval and is in editing. The topic panel has strongly recommended formatting this document to be a workbook, and printing an extra 5,000 copies for local government distribution. FHWA has agreed to fund this. There will be a color cover and tabs to reference the appendicdes.
20-05/Topic 33-08 Recruiting and Retaining Professional Staff in State Transportation Agencies
This synthesis will document the state of the practice in safety management system programs or similar efforts. It will report on the following topics: structures; state and local agency interaction, including accountability; roles and responsibilities of participants; how states developed multi-disciplinary strategic safety plans; how states identify and prioritize/select projects; funding sources; case studies; and monitoring and measurement. The final document has been published as Synthesis 322..
20-05/Topic 33-09 Statewide Highway Letting Program Management
State DOTs, consultants, contractors, and producers of highway materials find it challenging to attract and retain qualified individuals. This synthesis will review key literature sourcesand survey state transportation agencies to summarize reported experiences. Items of specific interest include organizational culture; compensation packages; educational reimbursement; training and recogition programs; professional development; and succession planning. The final document has been published as Synthesis 323.
20-05/Topic 33-10 Steel Bridge Erection Practices
State DOTs have established processes, with varying degrees of complexity, to manage their annual highway letting program and deliver projects of high quality. This synthesis will identify the processes currently used by state DOTs for highway letting program management. Items of particular interest are the breadth and variation of program management structures, how they deal with change, and how data is shared. This synthesis of practice may establish a foundation for information and data sharing to facilitate and accelerate improvements in DOT highway letting program management. The delivered the first draft for panel review and the review panel met March 27, 2003. The second draft was delivered in June 2003. 20-5 and panel comments have been received, and forwarded to the consultant. The final draft was due November 15, 2003. This was delivered Jan 15, 2004, and forwarded to editing. SNO approval was received on June 28. Publication is expected on August 30, 2004.
20-05/Topic 33-11 Integrating Tourism and Recreation Travel with Transportation Planning and Project Delivery
The erection of steel bridges poses many critical issues for owners. Because there is a great variety of practices being used today, there are often concerns with speed, safety, quality, delays, and claims related to the erection of steel bridges. This synthesis will examine and discuss practices for steel erection of I- and box-girder bridges, particularly curved, skewed, and staged structures. It will address critical issues that influence steel bridge erection and the practices for dealing with those issues. Key items to consider include, but are not limited to: impact of design and analysis practices on erection; methods used to predict erection deflections as a function of bridge type and complexity; shop assembly practices and alternative methods of assuring proper assembled geometry; sequencing of erection to ensure proper fit-up and to achieve desired girder profile/geometry; stability issues during all phases of bridge construction; field connection practices and their impact on final geometry; and owner requirements for erection procedures, implementation of requirements, and impact of procedures on the quality of the erection. The consultant has delivered the first draft, and the panel review meeting was held January 13, 2003. The consultant delivered a second draft, mid-March 2003. This was been returned to him for further work before external review. After discussions with the consultant, it was decided to employ Dennis Mertz of U Delaware to assist as a co-author. Funds to pay Dr. Mertz will come from the $25,000 original contract. The panel has been notified of this decision. The revised 2nd draft is was delivered by Dr. Mertz in December 2003. Fred Beckman and Dr. Mertz have collaboratively revised the draft, which was received March 29, 2004, and was forwarded to the panel for their review. Review comments were sent to the consultants on May 28; the revised second draft was delivered and reviewed by panel and 20-5 committee. The consultants have prepared the final draft, which was submitted for SNO approval on November 16, and was published in May, 2005.
20-05/Topic 33-12 Integrating Freight Facilities and Operations with Community Goals
ISTEA directed the transportation planning, development, and implementation process from 1991 to 1997, requiring consideration of access to federal lands. Tourism and recreation were to be addressed by MPOs and states. TEA 21 continues in this direction. This synthesis will document how MPOs and states use different methods to incorporate tourist, visitor and recreation travel needs into the planning and decision-making process. Topics to be explored include technical analysis tools, institutional relationships/partnerships, innovative financing, and stakeholder involvement techniques. The final document has been published as synthesis 329.
20-05/Topic 34-01 Centerline Rumble Strips
Freight transportation has been growing and an ongoing challenge is the accommodation of new and existing freight transportation facilities. Issues have led to concerns. Resolution of these can be in conflict with economic growth and development objectives. This synthesis will identify successful effots in location and operations of freight transportation facilities and synthesize information on techniques and procedures required for such facilities to be "good neighbors". Topics to be addressed include traffic, safety, security, land use, and environmental issues. The final document has been published as Synthesis 320.
20-05/Topic 34-02 Road Safety Audits
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 339: Centerline Rumble Strips (CLRS) examines current design, installation, configuration, dimension, and visibility issues associated with CLRS. The report addresses the need for guidance on warrants, benefits, successful practices, and concerns such as external noise and the reduced visibility of centerline striping material. Also addressed are pavement deterioration, ice buildup in the grooves, adverse impact on emergency vehicles, and the effect of CLRS on bicyclists. Particular attention was paid to available before-and-after CLRS installation crash data to document the safety aspects of CLRS and the availability of policies, guidelines, warrants, and costs regarding their use and design. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=4860
20-05/Topic 34-03 Linking Strategic Planning to Resource and Implementation Issues
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 336: Road Safety Audits examines the state of the practice of road safety audit (RSA) and road safety audit review applications for U.S. states and Canadian provinces. This synthesis also reviews international RSA practices. RSAs were first introduced in the United Kingdom more than 20 years ago and have been applied in New Zealand and Australia since the 1990s. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=4477
20-05/Topic 34-04 Automated Pavement Distress Collection Techniques
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 326: Strategic Planning and Decision Making in State Departments of Transportation examines state and provincial transportation departments' experience with strategic planning and synthesizes current approaches to linking strategic planning with other decision-making processes, including operational and tactical planning, resource allocation, performance management, and performance measurement. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=3673
20-05/Topic 34-05 Effective Construction Management of Disadvantaged Business Enterprise Issues
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 334: Automated Pavement Distress Collection Techniques examines highway community practice and research and development efforts in the automated collection and processing of pavement condition data techniques typically used in network-level pavement management. The scope of the study covered all phases of automated pavement data collection and processing for pavement surface distress, pavement ride quality, rut-depth measurements, and joint-faulting measurements. Included in the scope were technologies employed, contracting issues, quality assurance, costs and benefits of automated techniques, monitoring frequencies and sampling protocols in use, degree of adoption of national standards for data collection, and contrast between the state of the art and the state of the practice. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=4370
20-05/Topic 34-06 Convertible Roadways and Lanes
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 334: Automated Pavement Distress Collection Techniques examines highway community practice and research and development efforts in the automated collection and processing of pavement condition data techniques typically used in network-level pavement management. The scope of the study covered all phases of automated pavement data collection and processing for pavement surface distress, pavement ride quality, rut-depth measurements, and joint-faulting measurements. Included in the scope were technologies employed, contracting issues, quality assurance, costs and benefits of automated techniques, monitoring frequencies and sampling protocols in use, degree of adoption of national standards for data collection, and contrast between the state of the art and the state of the practice. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=4370
20-05/Topic 34-07 Cooperative Agreements for Corridor Management
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 340: Convertible Roadways and Lanes examines the characteristics and operational requirements, costs, and benefits of convertible roadways and lanes. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=4660
20-05/Topic 34-08 Use of Ultra-thin Whitetopping
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 337: Cooperative Agreements for Corridor Management examines the current state of practice in developing and implementing cooperative agreements for corridor management, elements of such agreements, and successful practices or lessons learned. The report focuses on cooperative agreements between two or more government agencies or between public and private entities that address land use and transportation linkages. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=4659
20-05/Topic 34-09 Concrete Bridge Deck Performance
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 338: Thin and Ultra-Thin Whitetopping summarizes available information to document how state departments of transportation and others are currently using thin and ultra-thin whitetopping overlays among various pavement rehabilitation alternatives. The report covers all stages of the proper application of whitetopping overlays, including project selection, design, materials selection, construction, maintenance, and eventual rehabilitation or replacement. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=4630
20-05/Topic 34-10 Winter Highway Operations
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 333: Concrete Bridge Deck Performance examines previous and current design and construction practices designed to improve the performance of bridge decks. Topics covered in this synthesis include factors that contribute to the durability of concrete bridge decks; performance of various types of deck protection strategies; lessons learned and the current state of the practice in design, construction, and maintenance of concrete bridge decks; available comparative analysis of the effects of using different methods and materials; specific reports of successes and failures; sample design and construction specifications; and more. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=4369
20-05/Topic 34-11 Geographic Information System Applications in Pavement Management
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 344: Winter Highway Operations examines changes that occurred between 1994 and 2004 to practices and strategies used to control the impacts of winter weather on the safe and efficient movement of traffic. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=5076
20-05/Topic 34-12 Access Location and Design on Crossroads in the Vicinity of Freeway Interchanges
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 335: Pavement Management Applications Using Geographic Information Systems examines the state of the practice and knowledge of pavement management systems (PMS) using geographic information systems (GIS) and other spatial technologies, and discusses how the technologies have been combined to enhance the highway management process. The synthesis reviews the principal issues related to PMS data collection, integration, management, and dissemination; applications of spatial technologies for map generation and PMS spatial analysis; and implementation-related issues, including approaches used for integrating PMS and GIS and the different tools used to support pavement management decisions. The final report is publshed at http://www.trb.org/news/blurb_detail.asp?id=4476
20-05/Topic 35-01 State Quality Assurance Programs
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 332: Access Management on Crossroads in the Vicinity of Interchanges examines current practices relating to access location and design on crossroads in the vicinity of interchanges. It identifies standards and strategies used on new interchanges and on the retrofit of existing interchanges. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=4201
20-05/Topic 35-02 Chip Seal Best Practices
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 346: State Construction Quality Assurance Programs examines current quality assurance practices of state and federal departments of transportation with regard to highway materials and construction. The report focuses on the strategies and practices used by agencies to ensure quality. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=5150
20-05/Topic 35-03 Crash Records Systems
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 342: Chip Seal Best Practices examines ways to assist in the development and implementation of pavement preservation programs by identifying the benefits of using chip seal as part of a preventive maintenance program and by highlighting advanced chip seal programs in use around the world. The report includes approximately 40 best practices in the areas of chip seal design methods, contract administration, equipment practices, construction practices, and performance measures. According to the report, the increased use of chip seals for maintenance can be a successful, cost-effective way of using preventive maintenance to preserve both low-volume and higher-volume pavements. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=4901
20-05/Topic 35-04 Value Engineering Practices in Transportation
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 350: Crash Records Systems examines crash records systems practices and programs as applied to highway and traffic safety. The report covers crash data collection, crash processing and management, and data linkages for reporting and analysis. While no single comprehensive system examples are identified in the report, many examples of one or more successful components were found to address the needs of three groups of stakeholders—data collectors, data managers, and data users. The report also contains information about lessons learned from examples of successful systems, addressing the needs and concerns of stakeholders. This topis is published at http://www.trb.org/news/blurb_detail.asp?id=5840
20-05/Topic 35-05 Developing Transportation Agency Leaders
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 352: Value Engineering Applications in Transportation examines the current value engineering (VE) practices of highway transportation agencies in the United States and Canada. Value engineering (VE) is the systematic review of a project, product, or process to improve performance, quality, and/or life-cycle cost by an independent multidisciplinary team of specialists. The report identifies the reported best practices, key strengths, and challenges of current VE study processes and agency programs, and offers guidance on applying and improving the effectiveness of VE in projects and programs. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=5705
20-05/Topic 35-06 Access Rights
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 349: Developing Transportation Agency Leaders examines practices and innovative approaches that address the development of transportation leadership in today’s work environment. The report covers demographics, recruitment and retention, leadership training, and succession management. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=5402
20-05/Topic 35-07 Inspection and Maintenance of Cable-Stayed Bridges
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 351 examines issues involved in acquiring access rights along roadways other than freeways. The report documents the state of the practice with the intent to limit the amount of access to the roadway for the purpose of managing highway safety and mobility. The report documents successful practices and current policies, legal and real estate literature, and other publications that address this subject. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=5618
20-05/Topic 35-08 Comprehensive Investigation of Bridges with Fracture Critical Details
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 353: Inspection and Maintenance of Bridge Stay Cable Systems identifies and explains various inspection and maintenance techniques for bridge stay cable systems. It discusses both short- and long-term approaches. The report information on methods for inspections and assessments, including nondestructive testing and evaluation procedures; repair and retrofit; methods for control of cable vibrations, including rain–wind vibrations; stay cable fatigue and failure; effectiveness of various inspection and repair methods; limitations of available technologies; and trends and recommendations for future study. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=5841
20-05/Topic 35-09 Compliance with National Historic Preservation Act Requirements for Archeological Investigation and Mitigation
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 354: Inspection and Management of Bridges with Fracture-Critical Details explores the inspection and maintenance of bridges with fracture-critical members (FCMs), as defined in the American Association of State Highway and Transportation Officials’ Load and Resistance Factor Design (LRFD) Bridge Design Specifications. The report identifies gaps in literature related to the subject; determines practices and problems with how bridge owners define, identify, document, inspect, and manage bridges with fracture-critical details; and identifies specific research needs. Among the areas examined in the report are inspection frequencies and procedures; methods for calculating remaining fatigue life; qualification, availability, and training of inspectors; cost of inspection programs; instances where inspection programs prevented failures; retrofit techniques; fabrication methods and inspections; and experience with fracture-critical members fractures and problems details. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=5870
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 347: Managing Archaeological Investigations addresses practices that improve archaeological investigations by both streamlining the overall transportation project delivery process and enhancing the stewardship of archaeological resources. The report examines practices that improve and maintain good communication and coordination at all stages of transportation programs, including that between agencies and Native Americans and efforts at public outreach. It also reviews internal state department of transportation (DOT) business practices, and examines effective and innovative practices for complying with Section 106 of the National Historic Preservation Act, the National Environmental Policy Act, and project design. The synthesis also examines pre-project planning efforts, including programmatic agreements, treatment guidance and specifications on specific archaeological resources, creative mitigation, and effective collection methods. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=5275
20-05/Topic 35-10 Improving the Safety of Older Road Users
20-05/Topic 35-11 Transportation Implications of Emerging Economic Development Trends
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 348: Improving the Safety of Older Road Users examines programs and policies in place across the country to improve the safety and mobility of older road users. The report documents a range of strategies and related programs under way in roadway engineering, driver licensing, public information and education, and enforcement and adjudication. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=5479
20-05/Topic 35-12 Transportation Technology Transfer Successes, Challenges, and Needs
TRB’s National Cooperative Highway Research Program (NCHRP) Research Results Digest 327: Transportation Implications of Emerging Economic Development Trends explores economic development trends and how transportation relates to these trends. The report focuses on business production, inventory, and logistics and distribution trends and practices; site selection research and practices; labor market considerations; urban and rural development practices; and international trade and global market trends and implications. The final report is at http://www.trb.org/news/blurb_detail.asp?id=9443
20-05/Topic 36-01 Bridge Rating Practices and Polices for Overweight Vehicles
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 355: Transportation Technology Transfer: Successes, Challenges, and Needs explores the use of technology transfer practices in the highway transportation community. The report documents successful practices, discusses challenges encountered, and identifies the needs of those responsible for sponsoring, facilitating, and conducting technology transfer activities and processes. This final report is pubilshed at http://www.trb.org/news/blurb_detail.asp?id=5977
20-05/Topic 36-02 Monitoring Scour Critical Bridges
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 359: Bridge Rating Practices and Policies for Overweight Vehicles explores overweight vehicle permit processes. The report includes information on state and provincial bridge rating systems, bridge evaluation practices, and permit policies as they relate to overweight and oversize vehicles. The report is designed to help in the understanding of the reasons for nonuniform permitting practices. The report reviews specifications, software types, treatment of nonstandard configurations, and allowance for in-place dead loads; processes of permit review; and personnel assigned to permit review. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=6516
20-05/Topic 36-03 Technologies for Improving Safety Data
TRB’s National Cooperative Highway Research Program (NCHRP) Report 396: Monitoring Scour Critical Bridges explores the current state of practice for fixed scour bridge monitoring.
20-05/Topic 36-04 Visualization for Project Development
TRB’s National Cooperative Highway Research Program (NCHRP) Syntheses 367: Technologies for Improving Safety Data explores new technologies for the acquisition, processing, and overall management of crash, roadway inventory, and traffic operations data. The report examines the current state-of-the-practice and state-of-the-art use of technologies for efficient and effective collection and maintenance of data for highway safety analysis. The final report is at http://www.trb.org/news/blurb_detail.asp?id=8042
20-05/Topic 36-05 Control of Invasive Species
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 361: Visualization for Project Development explores the visual representation of proposed alternatives and improvements and their associated effects on the existing surroundings. The report examines the best practices and experiences within transportation agencies that are developing and incorporating visualization into the project development process. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=6911
20-05/Topic 36-06 Pavement Markings- Design and Typical Layout Details
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 363: Control of Invasive Species explores the extent to which state departments of transportation are identifying actions that affect the spread of invasive species, preventing introduction, tracking status and locations of “invasives” in a timely and ongoing manner, controlling found populations, restoring invaded habitats, conducting research, and sharing lessons learned. The report documents successful practices and lessons learned. It also synthesizes the state of the practice in developing Integrated (Roadside) Vegetation Management, along with physical, chemical, biological, and cultural control mechanisms. The final report is at http://www.trb.org/news/blurb_detail.asp?id=7305
20-05/Topic 36-07 Training Program Policies, Processes, and Practices
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 356: Pavement Markings—Design and Typical Layout Details identifies variations in pavement marking designs, practices, and policies, as provided by 48 of 50 state departments of transportation, and transportation agencies from the District of Columbia, Puerto Rico and four cities. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=6322
20-05/Topic 36-08 Use of Geophysics for Transportation Projects
A synthesis is needed to report on state DOT transportation training, education, and professional development programs in order to provide valuable state of the practice input to the development of better workforce development programs. After review/comment at an August 2005 topic panel meeting and attending a state DOT training adminisrators' meeting, the consultant prepared a final draft that was sent out to the topic panel and 20-05 oversight committee for review/comment. Accommodating review comments, a final revised draft was submitted and has been published as NCHRP Synthesis 362
20-05/Topic 36-09 Statewide Travel Forecasting Models
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 357: Use of Geophysics for Transportation Projects examines the state of the practice regarding the use of geophysics for transportation projects. The report focuses on who is using geophysics and why, which methods and applications are the most commonly used, the use of in-house expertise compared with contracting private consultants, and how geophysical service contracts are procured and implemented. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=6259
20-05/Topic 36-10 Impact of Intermodal Freight Terminals Closures
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 358: Statewide Travel Forecasting Models examines statewide travel forecasting models designed to address planning needs and provide forecasts for statewide transportation, including passenger vehicle and freight movements. The report explores the types and purposes of models being used, integration of state and urban models, data requirements, computer needs, resources (including time, funding, training, and staff), limitations, and overall benefits. The report includes five case studies, two that focus on passenger components, two on freight components, and one on both passenger and freight. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=6571
20-05/Topic 36-11 Estimating Toll Facility Demand and Revenue
This synthesis was to report on the closing of intermodal truck-rail freight terminals across the U.S. Communication and planning processes that were implemented before, during, and after the closures will be documented and successful practice in mitigating the impacts resulting from the eventual mode shifts from rail to truck will also be investigated. State DOTs, local MPOs, and regional economic development authorities may be contacted for information. The topic experienced repeated adminstrative problems. As it is now out of phase with the rest of the 36-00 topics, it has been withdrawn, with the concurrence of the 20-05 oversight committee.
20-05/Topic 36-12 Use of Rock-Socketed Shafts for Highway Structure Foundations
TRB’s National Cooperative Highway Research Program (NCHRP) Syntheses 364: Estimating Toll Road Demand and Revenue examines the state of the practice for forecasting demand and revenues for toll roads in the United States. The report explores the models that are used to forecast the demand for travel and the application of these models to project revenues as a function of demand estimates. The final report is at http://www.trb.org/news/blurb_detail.asp?id=7570
20-05/Topic 36-16 State of Tribal Transportation Programs in the United States
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 360: Rock-Socketed Shafts for Highway Structure Foundations explores current practices pertaining to each step of the design process, along with the limitations; identifies emerging and promising technologies; examines the principal challenges in advancing the state of the practice; and investigates future developments and potential improvements in the use and design of rock-socketed shafts. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=6678
20-05/Topic 37-01 Multi-Disciplinary Teams in Context Sensitive Solutions
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 366: Tribal Transportation Programs explores innovations and model practices among tribal transportation programs. The report also examines the history, and legal and administrative evolution, of tribal transportation programs within the larger context of issues of tribal sovereignty and relationships with federal, state, and local governments, and local and regional planning agencies. The final report is available at http://www.trb.org/news/blurb_detail.asp?id=7746
20-05/Topic 37-02 Preservation of Institutional Memory
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 373: Multi-Disciplinary Teams in Context-Sensitive Solutions explores inclusion of multiple perspectives and disciplines in the decision-making process associated with developing transportation solutions that improve the quality of life for the communities being served by transportation agencies. A copy of this report can be found at http://onlinepubs.trb.org/onlinepubs/nchrp/nchrp_syn_373.pdf
20-05/Topic 37-03 Managing Selected Transportation Infrastructure Assets
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 365: Preserving and Using Institutional Memory through Knowledge Management Practices explores practices regarding the preservation and use of institutional memory through the knowledge management practices of United States and Canadian transportation agencies. The report examines practices for the effective organization, management, and transmission of materials, knowledge, and resources that are in the unique possession of individual offices and employees. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=7401
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 371: Managing Selected Transportation Assets: Signals, Lighting, Signs, Pavement Markings, Culverts, and Sidewalks explores the state of the practice for managing transportation infrastructure assets other than pavements and bridges, and documents gaps in knowledge and areas in need of potential further study. The link to the final report is http://trb.org/news/blurb_detail.asp?id=8496
20-05/Topic 37-05 Bridge Inspection Practices
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 375: Bridge Inspection Practices examines bridge inspection practices in the United States and selected foreign countries. The report explores inspection personnel (staff titles and functions, qualifications, training and certification, inspection teams, and the assignment of teams to bridges), inspection types (focus, methods, and frequency), and inspection quality control and quality assurance. The report also reviews the uses agencies make of information gathered from bridge inspections, what triggers repairs, and plans for future development of inspection programs. The final report is at
20-05/Topic 37-06 Emerging Technologies for Construction Delivery
20-05/Topic 37-07 Bridge Management Systems for Transportation Agency Decision-Making
20-05/Topic 37-08 Crash Reconstruction Practices
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 372: Emerging Technologies for Construction Delivery explores the use of five emerging technologies for transportation construction projects: global positioning systems for layout, machine guidance, and quantity tracking; handheld computers for construction records; automated temperature tracking for concrete maturity monitoring; four-dimensional computer-aided drafting modeling for constructability analysis and improved communications; and web-based video cameras for remote project monitoring. The final report is at http://trb.org/news/blurb_detail.asp?id=8659
20-05/Topic 37-09 Performance-Based Contracting for Maintenance
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 369: State DOT Crash Reconstruction Practices examines the extent of crash reconstruction undertaken by state departments of transportation (DOTs) and the level of expertise available to perform the tasks. In addition, the report explores the extent to which crash reconstructions are used by state DOTs to improve highway safety. The final report is published at http://www.trb.org/news/blurb_detail.asp?id=7973
20-05/Topic 37-10 Preserving Freight and Passenge Rail Corridors and Service
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 389: Performance-Based Contracting for Maintenance explores experience with performance-based maintenance contracting in places where it has been adopted, including such issues as whether it has the potential to reduce costs and improve maintenance levels of service. The final report is available at http://www.trb.org/news/blurb_detail.asp?id=10491
20-05/Topic 37-11 Debt Financing Practices
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 374: Preserving Freight and Passenger Rail Corridors and Service explores issues associated with the retention of railroad rights-of-way or restoration of rail services. The report can be found at http://onlinepubs.trb.org/onlinepubs/nchrp/nchrp_syn_374.pdf
20-05/Topic 37-12 Animal-Vehicle Collision Data Collection
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 395: Debt Finance Practices for Surface Transportation examines basic principles of debt issuance for public agencies. The report explores issues that may be useful in assisting in decisions on when and how to best use debt financing techniques to fund investments in transportation infrastructure. The final report is available at http://www.trb.org/news/blurb_detail.asp?id=10301
20-05/Topic 37-14 Cone PenetrationTest- State of Practice
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 370: Animal-Vehicle Collision Data Collection examines the extent to which data from animal–vehicle collision accident reports and animal carcass counts are collected, analyzed, and used throughout the United States and Canada. The final report is at http://www.trb.org/news/blurb_detail.asp?id=8422
20-05/Topic 38-01 Quality Assurance in Design-Build Projects
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 368: Cone Penetrating Testing explores the current practices of departments of transportation associated with cone penetration testing (CPT). The report examines cone penetrometer equipment options; field testing procedures; CPT data presentation and geostratigraphic profiling; CPT evaluation of soil engineering parameters and properties; CPT for deep foundations, pilings, shallow foundations, and embankments; and CPT use in ground modifications and difficult ground conditions. The final report is published at http://www.trb.org/news/blurb_detail.asp?id=8306
20-05/Topic 38-02 Information Technology for Efficient Project Delivery
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 376: Quality Assurance in Design-Build Projects examines how state transportation agencies have successfully approached quality assurance for design-build, including in procurement, design, construction, and post-construction operations and maintenance. The report is published at http://www.trb.org/news/blurb_detail.asp?id=9318
20-05/Topic 38-03 Compilation of Public Opinion Data on Tolls and Road Pricing
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 385: Information Technology for Efficient Project Delivery explores “best practices” for the seamless sharing of information throughout all phases of the project delivery process. This report is located at http://www.trb.org/news/blurb_detail.asp?id=10002
20-05/Topic 38-04 State Highway Cost Allocation Studies
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 377: Compilation of Public Opinion Data on Tolls and Road Pricing explores how the public feels about tolls and road pricing, examines public opinion concerning charging for the use of roads, and highlights factors associated with the acceptance or rejection of road pricing. This topic is published at http://www.trb.org/news/blurb_detail.asp?id=9125
20-05/Topic 38-05 LED Traffic Signal Monitoring, Maintenance and Replacemenrt Issues
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 378: State Highway Cost Allocation Studies examines the history and evolution of highway cost allocation study practice and explores the current state of the practice. Report located at http://www.trb.org/news/blurb_detail.asp?id=9539.
20-05/Topic 38-06 Pre-Overlay Treatment of Existing Pavements
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 387: LED Traffic Signal Monitoring, Maintenance, and Replacement Issues explores the maintenance and replacement of light-emitting diode (LED) traffic signal modules. Report located at http://www.trb.org/news/blurb_detail.asp?id=9859.
20-05/Topic 38-07 Forecasting Metropolitan Commercial and Freight Travel
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 388: Pre-Overlay Treatment of Existing Pavements explores current pre-overlay treatment practices of state departments of transportation for both hot-mix asphalt and portland cement concrete pavement structures. The report is designed to help pavement management and pavement design groups in their selection of pre-overlay treatments. The final report is available at http://www.trb.org/news/blurb_detail.asp?id=10051
20-05/Topic 38-09 Estimating Stiffness of Subgrades and Unbound Materials for Pavement Design
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 384: Forecasting Metropolitan Commercial and Freight Travel explores methods of freight and commercial vehicle forecasting currently in professional practice, along with promising methods emerging from ongoing research. The primary focus of the report is on metropolitan-level forecasting, although some consideration is given to statewide freight models. Report located at http://www.trb.org/news/blurb_detail.asp?id=9871.
20-05/Topic 38-10 High Speed Weigh-in-Motion System Calibration Practices
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 382: Estimating Stiffness of Subgrade and Unbound Materials for Pavement Design explores the significance of the resilient modulus property, various methods of determining this property of subsoils and unbound bases, and the application of this parameter in the mechanistic-empirical pavement design guide. Report located at http://www.trb.org/news/blurb_detail.asp?id=9866.
20-05/Topic 38-11 Changeable Message Sign Displays During Non-Incident, Non-Roadwork Periods
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 386: High-Speed Weigh-in-Motion System Calibration Practices explores the state of the practice in high-speed weigh-in-motion system calibration. Weigh-in-motion is the process of weighing vehicle tires or axles at normal roadway speeds ranging up to 130 km/h (80 mph). The final report is available at http://www.trb.org/news/blurb_detail.asp?id=9955
20-05/Topic 38-12 Alternative Contracting Methods to Facilitate Faster Construction and Reconstruction
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 383: Changeable Message Sign (CMS) Displays During Non-Incident, Non-Roadwork Periods explores the use of CMSs to convey messages on non-recurrent, environmental, special event traffic, and other special problems. Report located at http://www.trb.org/news/blurb_detail.asp?id=9710.
20-05/Topic 38-13 Illuminated, Active, In-Pavement Marker Systems
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 379: Selection and Evaluation of Alternative Contracting Methods to Accelerate Project Completion explores the process for selection of alternative contracting methods that can potentially accelerate project completion. The report also examines factors associated with selecting one type of alternative contracting technique over another. The report is available at http://www.trb.org/news/blurb_detail.asp?id=9552
20-05/Topic 38-15 Falling Weight Deflectometer Usage
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 380: Applications of Illuminated, Active, In-Pavement Marker Systems (IPMs) explores the state of IPM technology, experiences with IPM applications, and potential IPM research needs. The final report can be found at http://www.trb.org/news/blurb_detail.asp?id=9578
20-05/Topic 39-01 Quality Management of Pavement Distress Data Collection
This synthesis of highway agency practices for FWDs use will provide information needed to support guidelines for advancing the state-of-the practice. A review of the relevant literature in the field will be combined with surveys of state DOTS and other appropriate entities. Survey results and selected case studies will be developed to profile innovative and successful practices, as well as lessons learned. Gaps in information and knowledge will be identified along with research needs.
20-05/Topic 39-02 Improving the Safety of Mobile Lane Closures
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 401: Quality Management of Pavement Condition Data Collection explores the quality management practices being employed by public highway agencies for automated, semi-automated, and manual pavement data collection and delivery.
20-05/Topic 39-03 Cathodic Protection for Life Extension of Existing Reinforced Concrete Bridge Elements
TRB’s National Cooperative Highway Research Program (NCHRP) Research Results Digests 339: Improving the Safety of Mobile Lane Closures explores practices employed by transportation agencies during mobile lane closures and summarizes research carried out on different components of mobile lane closure.
Appendices A through D for NCHRP RRD 339 are available online.
20-05/Topic 39-04 Performance Based Construction Contractor Pre-qualification
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 398: Cathodic Protection for Life Extension of Existing Reinforced Concrete Bridge Elements examines the use of cathodic protection by state transportation agencies for controlling corrosion on existing reinforced concrete bridge elements. The report also explores the different types of cathodic protection systems, highlights case studies of states using these systems, and reviews reasons why public agencies may or may not employ cathodic protection.
Appendix A: Summaries of Questionnaires and Interview Results is available online.
Project: Project Information
This report is published http://www.trb.org/Publications/Blurbs/Cathodic_Protection_for_Life_Extension_of_Existing_162284.aspx
20-05/Topic 39-05 Emergency Evacuation and Reentry
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 390: Performance-Based Construction Contractor Prequalification explores experiences and practices of state transportation agencies associated with performance-based construction contractor prequalification. The report also examines information on the process developed in other sectors of the construction industry. This report is located at http://www.trb.org/news/blurb_detail.asp?id=10081
20-05/Topic 39-06 Public Sector Decision-Making in Public Private Partnerships
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 392: Transportation’s Role in Emergency Evacuation and Reentry explores information on transportation’s role in emergency evacuation and reentry by summarizing aspects of its planning, control, and research as well as highlighting effective and innovative practices.This report is located at http://www.trb.org/news/blurb_detail.asp?id=10106
20-05/Topic 39-07 Reducing Litter on the Roadsides
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 391: Public Sector Decision Making for Public–Private Partnerships examines information designed to evaluate the benefits and risks associated with allowing the private sector to have a greater role in financing and developing highway infrastructure. This report is located at http://www.trb.org/news/blurb_detail.asp?id=10079
20-05/Topic 39-08 Real Time Traveler Information for the Public
The st TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 394: Reducing Liter on Roadsides explores the state of the practice in reducing roadside litter as it involves state departments of transportation (DOTs). The report provides information concerning the prevention and removal of roadside litter, unfulfilled needs, knowledge gaps, and underperforming activities. It covers enforcement, education, awareness, and engineering methods for both litter prevention and collection. This report is located at http://www.trb.org/news/blurb_detail.asp?id=10562
20-05/Topic 39-09 Design Flexibility Considerations for Established Cities
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 399: Real-Time Traveler Information Systems explores the needs and expectations of travelers, the current status of a variety of traveler information systems in the United States, available and emerging data sources, and business models for sustaining traveler information. This report is located at http://www.trb.org/news/blurb_detail.asp?id=10633
20-05/Topic 39-10 Adjacent Precast Box Beam Bridges: Connection Details
TRB’s National Cooperative Highway Research Program (NCHRP) Research Results Digest 337: Design Flexibility Considerations for Built Urban Environments explores issues related to the use of roadway design exceptions or variances. The report also examines processes designed to help manage the use of exceptions or variances, and highlights potential means to provide a timely procedure for addressing design exceptions or variances. This report is located at http://www.trb.org/news/blurb_detail.asp?id=10263
20-05/Topic 39-11 Performance of Thin Polymer Overlays for Bridge Decks
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 393: Adjacent Precast Concrete Box Beam Bridges: Connection Details explores current design and construction practices that are reported to reduce the likelihood of longitudinal cracking in box beam bridges. This report is located at http://www.trb.org/news/blurb_detail.asp?id=10217
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 423: Long-Term Performance of Polymer Concrete for Bridge Decks addresses a number of topics related to thin polymer overlays (TPOs).
20-05/Topic 39-12 Identify Promising Technologies for Biological Surveys
20-05/Topic 39-13 Pavement Marking Warranty Specifications
Those topics include previous research, specifications, and procedures on TPOs; performance of TPOs based on field applications; the primary factors that influence TPO performance; current construction guidelines for TPOs related to surface preparation, mixing and placement, consolidation, finishing, and curing; repair procedures; factors that influence the performance of overlays, including life-cycle cost, benefits and costs, bridge deck condition, service life extension, and performance; and successes and failures of TPOs, including reasons for both.
20-05/Topic 40-01 Recycled Materials and Byproducts in Highway Applications
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 408: Pavement Marking Warranty Specifications presents information on the use of pavement marking warranties by United States and Canadian transportation agencies, including agency specifications. European experience is also included in the report for comparison purposes.
Appendices D and E for NCHRP Synthesis 408 are available online.
20-05/Topic 40-02 Construction Manager-at-risk Project Delivery for Highway Programs
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 435: Recycled Materials and Byproducts in Highway Applications—Summary Report, Volume 1 summarizes the results of a project that describes the experiences of transportation agencies in determining the relevant properties of recycled materials and industrial byproducts and the beneficial use for highway applications.
NCHRP Synthesis 435 is presented in eight volumes and is designed to help serve as a guide to states revising the provisions of their materials specifications to incorporate the use of recycled materials and industrial byproducts.
Volume 1 is available in print and electronic versions. Volumes 2 to 8 are in electronic format only. The eight volumes are:
Volume 1 Recycled Materials and Byproducts in Highway Applications—Summary Report
Volume 2 Coal Combustion Byproducts
Volume 3 Non-Coal Combustion Byproducts
Volume 4 Mineral and Quarry Byproducts
Volume 5 Slag Byproducts
Volume 6 Reclaimed Asphalt Pavement, Recycled Concrete Aggregate, and Construction Demolition Waste
Volume 7 Scrap Tire Byproducts
Volume 8 Manufacturing and Construction Byproducts
A NCHRP Synthesis 435 website with links to all 8 volumes is available.
20-05/Topic 40-03 Adaptive Traffic Control Systems : Domestic and Foreign State of Practice
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 402: Construction Manager-at-Risk Project Delivery for Highway Programs explores current methods in which state departments of transportation and other public engineering agencies are applying construction manager-at-risk (CMR) project delivery to their construction projects.
CMR project delivery is an integrated team approach to the planning, design, and construction of a highway project, to help control schedule and budget, and to help ensure quality for the project owner. The team consists of the owner; the designer, who might be an in-house engineer; and the at-risk construction manager. The goal of this project delivery method is to engage at-risk construction expertise early in the design process to enhance constructability, manage risk, and facilitate concurrent execution of design and construction without the owner relinquishing control over the details of design as it would in a design-build project.
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 403: Adaptive Traffic Control Systems: Domestic and Foreign State of Practice explores the state of practice of adaptive traffic control systems (ATCSs), also known as real-time traffic control systems, which adjust, in real time, signal timings based on traffic conditions, demand, and system capacity.
20-05/Topic 40-04 Utility Location and Highway Design
20-05/Topic 40-05 Effective Public Involvement Using Limited Resources
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 405: Utility Location and Highway Design explores current practices in use by transportation agencies for consideration of utilities during the project development process, including where in the process the utility impacts are assessed and relocation decisions made; what policies, regulations, manuals, and guidelines are used; and how design decisions are influenced by utilities.
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 407: Effective Public Involvement Using Limited Resources explores information about staff and agency experiences in the application of successful and cost-effective strategies and implementation techniques used to engage the public in the development of transportation plans and projects. The report also examines unsuccessful strategies.
20-05/Topic 40-06 Advanced Practices in Travel Forecasting
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 406: Advanced Practices in Travel Forecasting explores the use of travel modeling and forecasting tools that could represent a significant advance over the current state of practice. The report examines five types of models: activity-based demand, dynamic network, land use, freight, and statewide.
20-05/Topic 40-07 Trade-off Considerations in Highway Geometric Design
20-05/Topic 40-08 Effective Speed Reduction Techniques for Rural High to Low Speed Transitions
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 422: Trade-Off Considerations in Highway Geometric Design describes the processes that transportation agencies currently use to evaluate geometric design trade-offs between competing interests.
The report also highlights existing key publications on conventional approaches, context-sensitive solutions/context-sensitive design, and performance-based approaches, as well as gaps in information or analysis processes available to support design decisions.
20-05/Topic 40-09 Freight Transportation Surveys- Existing Methods and Guidelines
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 412: Speed Reduction Techniques for Rural High-to-Low Speed Transitions explores techniques for lowering traffic speeds in rural transition zones. Transition zones are those portions of high-speed roads that have lower posted speed limits as the roadway approaches a settlement.
20-05/Topic 40-10 Traffic Signal Retiming Practices in the U.S.
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 410: Freight Transportation Surveys profiles the state of the practice in methods and techniques used to survey and collect data on freight transportation. The report also examines issues, identifies gaps in knowledge, and notes areas for potential future research in the area of freight transportation systems.
20-05/Topic 40-11 The State of Practice in Highway Access Management
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 409: Traffic Signal Retiming Practices in the United States explores practices that operating agencies currently use to revise traffic signal timing. The report examines the processes used to develop, install, verify, fine-tune, and evaluate the plans.
20-05/Topic 40-13 Recycling and Reclamation of Asphalt Pavements Using In-Place Methods
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 404: TRB’s State of the Practice in Highway Access Management examines current practice, potential barriers, and possible enhancements to highway access management programs. The report focuses on legal, legislative, policy, program, implementation, and effectiveness issues related to access management.
Appendixes A-D of NCHRP Synthesis 404 are available online.
- Appendix A Access Management Survey
- Appendix B List of Responding Agencies
- Appendix C Summary of Survey Responses
- Appendix D Retrofit Toolbox
20-05/Topic 41-01 Geometric Design Practices for Resurfacing, Restoration, and Rehabilitation
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 421: Recycling and Reclamation of Asphalt Pavements Using In-Place Methods discusses the use of hot in-place recycling, cold in-place recycling, and full-depth reclamation of asphalt pavements.
In-place recycling and reclamation of asphalt pavements provides agencies with the ability to optimize the value of in-place materials, minimize construction time and traffic flow disruptions, and reduce the number of construction vehicles moving in and out of the construction area.
20-05/Topic 41-02 Effective Delivery of Small-Scale Federal Aid Projects
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 417: Geometric Design Practices for Resurfacing, Restoration, and Rehabilitation documents the current state-of-the-practice related to nonfreeway resurfacing, restoration, and rehabilitation projects.
Appendix G, Summary of Good Practices: Incorporating Safety into Resurfacing and Restoration Projects, to NCHRP Synthesis 417 is only available as part of the electronic version of the report.
20-05/Topic 41-03 Engineering Economic Analysis Practices for Highway Investment
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 414: Effective Delivery of Small-Scale Federal-Aid Projects examines streamlined methods for meeting federal funding requirements for small-scale highway projects.
The report explores ways that state departments of transportation work with local agencies to implement small projects eligible for federal funding.
Appendix G to NCHRP Synthesis 414 is available only in the pdf version of the report.
20-05/Topic 41-04 Sustainable Pavement Maintenance Practices
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 424: Engineering Economic Analysis Practices for Highway Investment explores how U.S. transportation agencies have applied engineering economics--benefit–cost analyses and similar procedures--to decisions on highway investments.
20-05/Topic 41-05 Design Fires in Road Tunnels
TRB’s National Cooperative Highway Research Program (NCHRP) Research Results Digest 365: Sustainable Pavement Maintenance Practices highlights the current practice in sustainable pavement maintenance and preservation.
The report is designed to help quantify and understand how pavement maintenance and preservation practices minimize environmental impacts.
As part of the development of this report, a general survey on sustainable pavement preservation and maintenance practices was issued to the state and provincial maintenance engineers in the United States and Canada. The full results of the survey and a summary of the survey are available for download as the following appendixes to NCHRP RRD 365.
• Appendix A: Survey Results
• Appendix B: Summary of Survey Results
Project: Project Information
E-Newsletter Type: Recently Released TRB Publications
TRB Publication Type: NCHRP Research Results Digest
20-05/Topic 41-06 Accelerating Implementation of Transportation Research Results
TRB’s National Cooperative Highway Research Program (NCHRP) 415: Design Fires in Road Tunnels information on the state of the practice of design fires in road tunnels, focusing on tunnel fire dynamics and the means of fire management for design guidance.
20-05/Topic 41-07 Operational and Institutional Agreements that Facilitate Regional Traffic Signal Operations Programs
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 461: Accelerating Implementation of Transportation Research Results examines implementation practices used by public-sector nontransportation agencies, nonprofits, and academia to accelerate practical application of research results. The emphasis is on practices that might be useful for transportation agencies to create more responsive research programs.
20-05/Topic 41-08 Implementing Race-Neutral Measures in State Disadvantaged Business Enterprise (DBE) Programs
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 420: Operational and Institutional Agreements That Facilitate Regional Traffic Signal Operations (RTSOPs) identifies and highlights critical attributes of successful RTSOPs across the United States.
Regions can use RTSOPs to help improve traffic flow as it crosses from one jurisdiction to another. A central focus of these programs is the coordination of signal timing on multi-jurisdictional arterials; however, RTSOPs can also facilitate the consideration of other traffic operations measures to improve regional mobility.
Many RTSOPs have been established through regional metropolitan planning organizations, and successful RTSOPs also have been established by other organizations, including state and local departments of transportation and government corporations.
20-05/Topic 41-09 Techniques for Effective Highway Construction Projects in Congested Urban Areas
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 416: Implementing Race-Neutral Measures in State Disadvantaged Business Enterprise Programs explores race-neutral strategies being used effectively by state departments of transportation (DOTs) to meet their Disadvantaged Business Enterprises (DBE) participation goals. It also reviews and synthesizes problems faced by state DOTs in the administration of their DBE programs and identifies race-neutral remedies used to overcome these challenges.
As state DOT's carry out their highway construction programs, they are required to direct a portion of their federal-aid fund expenditures toward small businesses called DBEs. A DBE is defined as a small, for-profit business concern that is at least 51% owned and controlled by one or more socially and economically disadvantaged individuals. States are required to meet the maximum feasible portion of their DBE participation goals using race-neutral means designed to remove barriers and enhance opportunities for all small businesses, not just DBEs.
20-05/Topic 41-10 Developing Production Pile Driving Criteria from Test Pile Data
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 413: Techniques for Effective Highway Construction Projects in Congested Urban Areas explores a diverse set of techniques designed to address highway construction challenges in congested urban areas such as high-traffic volumes, utility conflicts, complex right-of-way acquisition issues, a diverse stakeholder base, and watchful news media.
The report includes four case studies designed to help illustrate effective construction practices in congested urban areas.
20-05/Topic 41-11 Transportation Improvement Program Revision Process
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 418: Developing Production Pile Driving Criteria from Test Pile Data provides information on the current practices used by state transportation agencies to develop pile driving criteria, with special attention paid to the use of test pile data in the process.
20-05/Topic 41-12 Microsurfacing
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 419: Transportation Improvement Program Revision Process compiles and documents the different ways that metropolitan planning organizations (MPOs) approach revising a Transportation Improvement Program (TIP) once it has been adopted.
Federal legislation requires MPOs to adopt and regularly update a TIP identifying a prioritized list of projects covering a four-year period.
20-05/Topic 42-01 Geotechnical Information Practices in Design-Build Projects
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 411: Microsurfacing explores highway microsurfacing project selection, design, contracting, equipment, construction, and performance measurement processes used by transportation agencies in the United States and Canada.
Microsurfacing is a polymer-modified cold-mix surface treatment that has the potential to address a broad range of problems on today’s highways.
20-05/Topic 42-02 Use of the U. S. Census Bureau’s Public Use Microdata Sample (PUMS) by States and Metropolitan Planning Organizations
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 429: Geotechnical Information Practices in Design-Build Projects addresses how states use geotechnical information in solicitation documents and contracts for design-build highway projects.
The report examines current practices regarding the allocation of geotechnical risk and the level of geotechnical information provided with bid documents, the scope of geotechnical information required after contract award, geotechnical-related performance testing during construction, and contract provisions related to geotechnical design and construction.
20-05/Topic 42-03 Practice and Procedures for Site-Specific Evaluation of Earthquake Ground Motions
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 434: Use of the U.S. Census Bureau’s Public Use Microdata Sample (PUMS) by State Departments of Transportation and Metropolitan Planning Organizations describes ways that transportation planners are using the PUMS data.
The report is designed to serve as a reference for transportation planners who may be able to exploit these data. Census microdata are the confidential records of specific individuals and housing units from whom Decennial Census or American Community Survey responses have been obtained.
The U.S. Census Bureau also draws a sample from the full set of microdata and makes these sampled records available in the PUMS data products, so that users can develop their own tabulations.
These data are being used by state departments of transportation and metropolitan planning organizations for studies, such as analyses of the commuting characteristics of population subgroups, and for supporting travel demand model and land use models.
20-05/Topic 42-04 Recent Roadway Geometric Design Research for Improved Safety and Operations
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 428: Practices and Procedures for Site-Specific Evaluations of Earthquake Ground Motions identifies and describes current practice and available methods for evaluating the influence of local ground conditions on earthquake design ground motions on a site-specific basis.
The report focuses on evaluating the response of soil deposits to strong ground shaking.
20-05/Topic 42-05 Assessing the Long-Term Performance of Mechanically-Stabilized Earth (MSE) Walls
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 432: Recent Roadway Geometric Design Research for Improved Safety and Operations reviews and summarizes roadway geometric design literature completed and published from 2001 through early 2011, particularly research that identified impacts on safety and operations.
The report is structured to correspond to chapters in the American Association of State Highway and Transportation Officials’ A Policy on Geometric Design of Highways and Streets, more commonly referred to as the Green Book.
NCHRP Synthesis 432 is an update of NCHRP Synthesis 299 on the same topic published in 2001.
20-05/Topic 42-06 Performance-Based Highway Maintenance and Operations Management
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 437: Assessing the Long-Term Performance of Mechanically Stabilized Earth Walls explores methods to assess the long-term performance of mechanically stabilized earth walls. For the purposes of the report, "long-term" denotes the period of time from approximately one year after the wall is in service until the end of its design life.
The report focuses on state and federal agency wall inventories and highlights methods of inspection and assessment of wall conditions.
Mechanically stabilized earth walls are retaining walls that rely on internal reinforcement embedded in the backfill for stability.
20-05/Topic 42-07 Waterproofing Membranes for Concrete Bridge Decks
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 426: Performance-Based Highway Maintenance and Operations Management explores performance-based management practices that are applied by state departments of transportation (DOTs) in highway maintenance and operations.
20-05/Topic 42-08 Full-Scale Accelerated Pavement Testing, 2000 – 2011
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 425: Waterproofing Membranes for Concrete Bridge Decks documents information on materials, specification requirements, design details, application methods, system performance, and costs of waterproofing membranes used on new and existing bridge decks since 1995.
The synthesis focuses on North American practices with some information provided about systems used in Europe and Asia.
NCHRP Synthesis 425 is an update to NCHRP Synthesis 220: Waterproofing Membranes for Concrete Bridge Decks that was published in 1995.
20-05/Topic 42-09 Cost-effective and Sustainable Road Slope Stabilization and Erosion Control
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 433: Significant Findings from Full-Scale Accelerated Pavement Testing documents and summarizes significant findings from the various experimental activities associated with full-scale accelerated pavement testing (f-sAPT) programs that have taken place between 2000 and 2011.
The report also identifies gaps in knowledge related to f-sAPT and where future research may be needed.
NCHRP Synthesis 433 is designed to expand the f-sAPT base of knowledge documented in NCHRP Syntheses 325 and 235, both with the same title of Significant Findings from Full-Scale Accelerated Pavement Testing.
f-sAPT is the controlled application of a wheel loading, at or above the appropriate legal load limit, to a pavement system to determine pavement response in a compressed time period. The acceleration of damage is achieved by one or more of the following factors: increased repetitions, modified loading conditions, imposed climatic conditions, and thinner pavements with a decreased structural capacity which have shorter design lives.
20-05/Topic 42-10 Extent of Highway Capacity Manual Use in Planning
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 430: Cost-Effective and Sustainable Road Slope Stabilization and Erosion Control presents information on cost-effective and sustainable road slope stabilization techniques, with a focus on shallow or near-surface slope stabilization and related erosion control methods used on low-volume roads.
The report address topic planning, site investigation, erosion control techniques, soil bioengineering and biotechnical techniques, mechanical stabilization, and earthwork techniques.
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 427: Extent of Highway Capacity Manual Use in Planning assesses how state departments of transportation, small and large metropolitan planning organizations, and local governments are using or might use the Highway Capacity Manual for planning analyses, or more specifically, for performance monitoring, problem identification, project prioritization, programming, and decision-making processes.
20-05/Topic 42-11 Local Policies and Practices that Support Safe Pedestrian Environments
20-05/Topic 42-12 Practices to Manage Traffic Sign Retroreflectivity
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 436: Local Policies and Practices That Support Safe Pedestrian Environments documents various tools and strategies used by municipalities to improve the safety, convenience, and accessibility of the pedestrian experience.
20-05/Topic 43-01 Use of Transportation Asset Management Principles in State Highway Agencies
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 431: Practices to Manage Traffic Sign Retroreflectivity includes examples of practices that illustrate how different types of transportation agencies might meet federal retroreflectivity requirements for traffic signs.
20-05/Topic 43-02 High Performance Concrete Specifications and Practices for Bridges
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 439: Use of Transportation Asset Management Principles in State Highway Agencies explores the state of practice for transportation asset management among state departments of transportation.
20-05/Topic 43-03 Practices for Unbound Aggregate Pavement Layers
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 441: High Performance Specifications and Practices for Bridges documents the types of specifications and practices used by state transportation agencies to produce high performance concrete for bridges. The report also identifies specifications and practices reported as having improved concrete performance and those that have been less successful.
20-05/Topic 43-04 Practices and Performance Measures for Local Public Agency Federally-Funded Highway Projects
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 445: Practices for Unbound Aggregate Pavement Layers consolidates information on the state-of-the-art and state-of-the-practice of designing and constructing unbound aggregate pavement layers. The report summarizes effective practices related to material selection, design, and construction of unbound aggregate layers to potentially improve pavement performance and longevity.
20-05/Topic 43-05 Practical Design/Practical Solutions Practices
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 442: Practices and Performance Measures for Local Public Agency Federally Funded Highway Projects explores what performance measures, delivery practices, strategies, and tools are currently used in relation to federally-funded local public agency (LPA) highway project development and delivery, and how they are used to measure success in project administration.
Appendix D to NCHRP Synthesis 422, which provides samples of documents that exhibit practices or performance measures for federally funded LPA transportation projects, is not included in the print or PDF version of the report. Appendix D is available online.
20-05/Topic 43-06 Pollutant Load Reductions for Total Maximum Daily Load (TMDL) Reductions for Highways
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 443: Practical Highway Design Solutions presents information on the application of practical design approaches in roadway project development.
Practical design is the default term used in the report to describe approaches or initiatives some state transportation agencies have adopted that result in design solutions for specific roadway projects believed to better address the critical needs of the entire roadway system.
20-05/Topic 43-07 Performance Based Seismic Bridge Design
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 444, Pollutant Load Reductions for Total Maximum Daily Loads for Highways presents information on the types of structural and non-structural best management practices currently being used by state departments of transportation, including performance and cost data.
20-05/Topic 43-08 State DOT Small Business Programs
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 440, Performance-Based Seismic Bridge Design (PBSD) summarizes the current state of knowledge and practice for PBSD. PBSD is the process that links decision making for facility design with seismic input, facility response, and potential facility damage.
The goal of PBSD is to provide decision makers and stakeholders with data that will enable them to allocate resources for construction based on levels of desired seismic performance.
20-05/Topic 43-09 Use of Advanced Geospatial Data Tools, Technologies, and Information in DOT Projects
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 438: Expedited Procurement Procedures for Emergency Construction Services explores procurement procedures being utilized by state departments of transportation in coordination with federal agencies to repair and reopen roadways in emergency situations.
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 446: Use of Advance Geospatial Data, Tools, Technologies, and Information in Department of Transportation Projects that explores the development, documentation, and introduction of advanced geospatial technologies within departments of transportation.
20-05/Topic 43-10 Active Traffic and Demand Management Strategies for Arterials Roadways
The report also provides a discussion of strengths and weaknesses of leading technologies, and how they are being used today.
20-05/Topic 43-11 Expedited Procurement Procedures for Emergency Construction Services
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 447: Active Traffic Management for Arterials practices associated with the design, implementation, and operation of active traffic management (ATM) on arterial roadways.
ATM includes a suite of strategies that are used to manage traffic flow in order enhance capacity and safety.
20-05/Topic 43-12 Reducing the Effects of Roadway Deicers on the Natural Environment
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 438: Expedited Procurement Procedures for Emergency Construction Services explores procurement procedures being utilized by state departments of transportation in coordination with federal agencies to repair and reopen roadways in emergency situations.
20-05/Topic 43-13 Forecasting Construction Staffing Requirements for Future Projects
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 449: Strategies to Mitigate the Impacts of Chloride Roadway Deicers on the Natural Environment documents the range of methods, tools, and techniques used by transportation agencies to minimize the environmental impact of chloride-based roadway deicers.
20-05/Topic 43-14 State Department of Transportation Fleet Replacement Management Practices
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 450: Forecasting Highway Construction Staffing Requirements gathers information on the methods being used at highway transportation agencies to forecast staffing requirements.
20-05/Topic 43-15 Models for Effective Emergency Medical Services Response to Motor Vehicle Crashes in Rural Areas
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 452: State Department of Transportation Fleet Replacement Management Practices explores the current state of the practice regarding fleet replacement management and financing methods by state departments of transportation. The report also includes a discussion of the perceived strengths and weaknesses of different management and financing methods.
20-05/Topic 44-01 FEMA and FHWA Emergency Relief Funds Reimbursements to State Departments of Transportation
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 451: Emergency Medical Services Response to Motor Vehicle Crashes in Rural Areas identifies potential factors that may help reduce the time needed to provide effective medical care to crash occupants on rural roads.
20-05/Topic 44-02 Using the Economic Value Created by Transportation to Fund Transportation
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 472: FEMA and FHWA Emergency Relief Funds Reimbursements to State Departments of Transportation documents the experiences of state departments of transportation (DOTs) with federal disaster reimbursement programs. The report summarizes efforts and enhancements made by DOTs to secure appropriate reimbursements and simplify cost identification.
20-05/Topic 44-03 Outsourcing Winter Maintenance
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 459: Using the Economic Value Created by Transportation to Fund Transportation presents information on financing mechanisms used by transportation agencies to capture a portion of the economic value created by public investment in transportation infrastructure to fund transportation improvements.
The report provides an overview of ten types of “value capture” mechanisms and presents case examples of how transportation agencies have used these mechanisms to help fund specific highway projects.
This topic is being canceled due to an overlap with existing research.
20-05/Topic 44-04 Pavement Patching Practices
TRB Staff contact:
Jon M. Williams
fax: 202.334.2081 email: email@example.com
20-05/Topic 44-05 Roadway Safety Data Interoperability between Local and State Agencies
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 463: Pavement Patching Practices summarizes current practices for patching small-scale surface defects in concrete and asphalt pavements.
20-05/Topic 44-06 Implementation of the AASHTO Mechanistic-Empirical Pavement Design Guide and Software
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 458, Roadway Safety Data Interoperability Between Local and State Agencies provides an overview of the state of the practice regarding the interoperability between state and local safety data. The report also highlights agency practices that supporta data-driven safety program on all public roads.
20-05/Topic 44-07 Thin Asphalt Concrete Overlays
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 457: Implementation of the AASHTO Mechanistic-Empirical Pavement Design Guide and Software documents the experience of transportation agencies in the implementation of the 2008 American Association of State Highway and Transportation Officials (AASHTO) Mechanistic-Empirical Pavement Design Guide: A Manual of Practice (MEPDG) and the 2011 software program, AASHTOWare Pavement ME DesignTM (formerly DARWin-ME).
The MEPDG and accompanying software are based on mechanistic-empirical (ME) principles and are a significant departure from the previous empirically based AASHTO pavement design procedures.
20-05/Topic 44-08 Response to Extreme Weather Impacts on Transportation Systems
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 464: Thin Asphalt Concrete Overlays documents the current state of the practice as well as research efforts on the use of thin asphalt concrete overlays for pavement maintenance, rehabilitation, and preservation.
20-05/Topic 44-09 Alternative Technical Concepts for Contract Delivery Methods
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 454: Response to Extreme Weather Impacts on Transportation Systems examines eight recent cases of extreme weather in the United States from the perspectives of transportation operations, maintenance, design, construction, planning, communications, interagency coordination, and data and knowledge management.
Appendices C-H are only available in the PDF version of the report.
20-05/Topic 44-10 Non-Nuclear Methods for Compaction Control of Unbound Materials
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 455: Alternative Technical Concepts for Contract Delivery Methods Transportation documents various methods by which agencies have successfully implemented alternative technical concepts (ATCs) during the highway contracting process.
The report identifies methods that promote transparency and fairness, while at the same time protecting the industry’s right to confidentiality. The U.S. Federal Highway Administration defines an ATC as “a request by a proposer to modify a contract requirement, specifically for that proposer’s use in gaining competitive benefit during the bidding or proposal process … [and] must provide a solution that is equal to or better than the owner’s base design requirements in the invitation for bid or request for proposal document.”
20-05/Topic 44-11 Managing Longitudinal Utility Installations on Controlled Access Highway Right-of-Way
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 456: Non-Nuclear Methods for Compaction Control of Unbound Materials documents information on national and international experience with non-nuclear devices and methods for measuring compaction of unbound materials.
20-05/Topic 44-12 Interactive Training for All-Hazards Emergency Planning, Preparation, and Response for Maintenance and Operations Field Personnel
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 462: Managing Longitudinal Utility Installations on Controlled Access Highway Right-of-Way surveys state departments of transportation (DOTs) to identify and synthesize exemplary practices to help highway officials manage longitudinal utility installations on controlled access highway right-of-ways.
20-05/Topic 44-13 Sharing Operational Data Among Agencies
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 468: Interactive Training for All-Hazards Emergency Planning, Preparation, and Response for Maintenance and Operations Field Personnel identify interactive emergency training tools and sources that may be applied by maintenance and operations field personnel of state departments of transportation and public works agencies. The report also identifies potential obstacles to their implementation and develops a toolkit of relevant training and exercise information.
20-05/Topic 44-14 Permanent Signs Mounted on Median Barriers
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 460: Sharing Operations Data Among Agencies document both the qualitative and quantitative business cases for sharing data among transportation-related agencies. The study also documents the institutional, legal, and technical challenges that can inhibit data sharing.
20-05/Topic 44-15 State Bridge Load Posting Processes and Practices
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 465: Permanent Signs Mounted on Median Barriers reports on the current state of practice for mounting permanent highway signs on top of rigid median barriers throughout the United States.
20-05/Topic 45-01 Service Life of Culverts
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 453: State Bridge Load Posting Processes and Practices is a synthesis of the practices of U.S. state governments in restricting weights of vehicles that can cross highway bridges and culverts to levels below legal loads. Bridges and culverts restricted for vehicle weights are called load posted structures. The load posting practices of bridge owners include the identification of structures to post for load, the evaluation of safe load capacities of these structures, and the implementation of restrictions on vehicle weights at structures.
20-05/Topic 45-02 Practices for Developing Transparent Best Value Selection Procedures
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 474: Service Life of Culverts explores the time during which a culvert is expected to provide a desired function with a specified level of maintenance established at the design or retrofit stage.
This study is an update of NCHRP Synthesis 254: Service Life of Drainage Pipe (1998), which itself was an update of NCHRP Synthesis 50: Durability of Drainage Pipe (1978). Developments in plastic pipe, fiber-reinforced concrete pipe, polymeric-coated metal pipe, recycled materials, larger and more diverse structures, and sophisticated analytical soil-structure interaction modeling within the past 15 years led to the development of this report.
20-05/Topic 45-03 Current Practices to Set and Monitor DBE Goals on Design-Build Projects and Other Alternative Project Delivery Methods
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 471: Practices for Developing Transparent Best Value Selection Procedures examines practices related to the best value bid approach to procuring highway construction services. Best value procurement is a process to select the most advantageous offer by evaluating schedule, technical merit, management solutions, and past performance in addition to price.
20-05/Topic 45-05 Design and Load Testing of Large Diameter Open-Ended Driven Piles
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 481: Current Practices to Set and Monitor DBE Goals on Design-Build Projects and Other Alternative Project Delivery Methods synthesizes current practices and challenges that state departments of transportation (DOTs) face as they set and monitor the Federal Disadvantaged Business Enterprise (DBE) program goals on design-build and other alternative delivery projects. This study focuses on key issues associated with DBE contract goals, including how requirements are established, how submissions are evaluated, how program compliance is monitored through the contract, and what mechanisms are available to state DOTs for enforcement.
20-05/Topic 45-06 Work Zone Speed Management
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 478: Design and Load Testing of Large Diameter Open-Ended Driven Piles documents information regarding the current state of practice with respect to the selection, use, design, construction, and quality control of large diameter open-ended driven piles for transportation structures. This report may provide agencies with information to develop guidance and methods for technical guides and design codes, as well as to identify gaps in knowledge to guide future research.
20-05/Topic 45-07 Forecasting Transportation Revenue Sources: Survey of State Practices
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 482: Work Zone Speed Management documents the current state of practice for work zone speed management, including data, procedures, techniques, and technical issues related to observing and comparing work zone speeds.
20-05/Topic 45-09 Indefinite Delivery/Indefinite Quantity Contracting Practices
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 479: Forecasting Transportation Revenue Sources: Survey of State Practices documents current and proposed forecasting methodologies, as well as shortcomings of methods as reported by state departments of transportation (DOTs). The report also includes information about the types of revenue being forecasted, and how satisfied DOTs have been by the accuracy of their projections.
20-05/Topic 45-10 The Impacts of Energy Developments on U.S. Roads and Bridges
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 473: Indefinite Delivery/Indefinite Quantity Contracting Practices examines practices related to the use of Indefinite Delivery/Indefinite Quantity (IDIQ) contracting by transportation agencies for highway design, construction, and maintenance contracts. The synthesis covers multiple aspects of IDIQ practice, including contracting techniques, terminology used by transportation agencies, contract advertising and award practices, successful contracting procedures, pricing methods, risk management issues, and effective contract administration practices.
20-05/Topic 45-11 Economic and Development Implications of Transportation Disinvestment
TRB’s National Cooperative Highway Research Board (NCHRP) Synthesis 469: Impacts of Energy Developments on U.S. Roads and Bridges documents the economic impact of heavy truck traffic related to energy development on the nation’s roads and bridges.
20-05/Topic 45-12 Methods and Practice on Reduction and Elimination of Asphalt Mix Segregation
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 480: Economic and Development Implications of Transportation Disinvestment examines methods available to estimate disinvestment effects on transportation system integrity within and across modes in urban areas, regionally, and in non-metro areas, and the use of those methods by transportation agencies. The report focuses on macroeconomic effects, intermodal tradeoffs, and methods for broadly informing disinvestment decision making in an era of constrained resources. The report includes information on economic forecasting and travel demand models, risk or probability models, needs models, and benefit and impact models.
20-05/Topic 45-13 Maintenance Quality Assurance Field Inspection Practices
TRB's National Cooperative Highway Research Program Synthesis 477: Methods and Practices on Reduction and Elimination of Asphalt Mix Segregation provides guidance on how to reduce or eliminate segregation during aggregate production, mix design, asphalt mix production, mix transport and transfer, and placement. The report also explores options for reducing or eliminating segregate, as well as caveats for what not to do are included.
20-05/Topic 45-15 Fiber Additives in Asphalt Mixtures
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 470: Maintenance Quality Assurance Field Inspection Practices summarizes practices used by state transportation agencies to support maintenance investments. Appendices A and B are only available through the online PDF document.
20-05/Topic 45-16 Alliance Contracting – Evolving Alternative Project Delivery
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 475: Fiber Additives in Asphalt Mixtures summarizes the types of fibers used in asphalt mixtures, their properties, how they are tested, how they are applied, and lab and field performance of the fiber mixes.
20-05/Topic 45-17 Visualization of Geotechnical Data for Hazard Mitigation and Disaster Response
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 466: Alliance Contracting—Evolving Alternative Project Delivery synthesizes current practices related to the use of alliance contracts around the world, and explores the procurement procedures that have been used to successfully implement alliance contracting on typical transportation projects.
20-05/Topic 46-01 Public Perception of Mileage-Based User Fees
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 467: Visualization of Technical Data for Hazard Mitigation and Disaster Response evaluate the tools and techniques used for mitigating geotechnical hazards and responding to geotechnical disasters such as landslides, rockfalls, settlement, sinkholes, and other events.
20-05/Topic 46-02 Roundabout Practices
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 487: Public Perception of Mileage-Based Use Fees explores proposals to replace the current motor fuel tax with a road usage charge assessed on vehicle-miles traveled, often called a mileage-base user fee (MBUF). The report identifies and assesses various measures of public opinion on the MBUF concept.
20-05/Topic 46-03 Performance Specifications for Asphalt Mixtures
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 488: Roundabout Practices summarizes roundabout policies, guidance, and practices within state departments of transportation (DOTs) as of 2015. The synthesis may be used as a reference for state agencies that are creating or updating their roundabout and intersection control policies.
20-05/Topic 46-04 Influence of Geotechnical Investigation and Subsurface Conditions on Claims, Change Orders and Overruns
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 492: Performance Specifications for Asphalt Mixtures documents the performance tests used in conjunction with volumetric properties for mixtures. Performance tests are intended to extend service life by guiding material selection and proportions. The synthesis provides examples of engineering tools used in the development and implementation of performance specifications for asphalt mixtures, examples of the contents of performance-based specifications (PBS) currently used or in development, information on test program implementation and research efforts related to PBS for asphalt mixtures, and the reported benefits and challenges with implementing PBS.
20-05/Topic 46-05 Use of Reclaimed Asphalt Pavement and Recycled Asphalt Shingles in Asphalt Mixtures
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 484: Influence of Geotechnical Investigation and Subsurface Conditions on Claims, Change Orders, and Overruns documents the extent and type of claims, change orders, and cost overruns from subsurface conditions for state departments of transportation (DOTs). The report also identifies practices used by agencies to reduce such claims, change orders, and cost overruns.
20-05/Topic 46-06 Use of Mobile Information Technology Devices in the Field for Design, Construction and Asset Management
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 495: Use of Reclaimed Asphalt Pavement and Recycled Asphalt Shingles in Asphalt Mixtures summarizes current practices for the use of reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS) in the design, production, and construction of asphalt mixtures. It focuses on collecting information about the use, rather than just what is allowed, of high RAP, RAS, and/or a combination of RAP and RAS.
20-05/Topic 46-07 State Practices for Local Road Safety
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 491: Uses of Mobile Information Technology Devices in the Field for Design, Construction, and Asset Management documents the state-of-the-practice and state-of-the-art applications of state transportation agencies related to their use of mobile information technology (IT) devices. Specifically, the report reviews applications pertaining to the areas of design, construction, and asset management. Mobile IT devices such as laptop computers, mini-laptop computers, handheld multifunctional data collectors, tablets, and smartphones also play a role in bringing the transportation industry into digital platforms.
20-05/Topic 46-09 Extending Bridge Service Life through Field Welded Repair and Retrofits
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 486: State Practices for Local Road Safety explores state programs and practices that address local agency road safety. The report focuses on changes in local road safety programs since the legislation of Moving Ahead for Progress in the 21st Century (MAP-21), and the use of Engineering, Enforcement, Education and Emergency Services (4E) approaches to local road safety.
Three-quarters of all road miles in the United States are owned and maintained by local entities. More than half of all fatal crashes occur on rural roads, which are mostly owned by local entities. NCHRP Synthesis 486 documents the state transportation agency programs and practices that address local agency road safety.
The report includes information on state program size, funding sources, and administrative procedures; and noteworthy local/state program partnerships and initiatives to improve safety.
20-05/Topic 46-10 Application of Pedestrian Crossing Treatments for Streets and Highways
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 489: Extending Bridge Service Like Through Field Welded Repairs and Retrofits documents practices associated with field welded repairs on existing steel bridges used by bridge owners. The information presented includes the extent to which field welding is performed on existing bridges, common types of field welded repairs and retrofits, specifications, and quality control practices.
20-05/Topic 46-11 Post-Extreme Event Damage Assessment and Response for Highway Bridges
TRB's NCHRP Synthesis 498: Application of Pedestrian Crossing Treatments for Streets and Highways compiles information on the state of existing practices regarding application of pedestrian crossing improvements, and does not produce new guidance. The report includes a survey of state departments of transportation (DOTs) and local transportation agencies, a synthesis of current recommended practice and policy guidance, and a literature review of safety evidence for more than 25 pedestrian crossing treatments.
20-05/Topic 46-12 Converting Paved Roads to Unpaved
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 497: Post-Extreme Event Damage Assessment and Response for Highway Bridges reviews the procedures that state departments of transportation and two local authorities, New York City and Los Angeles County, use to assess the damage in bridges in response to extreme events and conduct emergency response activities. Extreme events include those with geological sources (such as earthquakes and landslides), from hydro-meteorological sources (such as hurricanes and floods), or those of man-made origin, either accidental (such as truck crashes) or malicious (such as terrorist attacks).
20-05/Topic 46-13 Practice of Rumble Strips and Rumble Stripes
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 485: Converting Paved Roads to Unpaved explores how common and under what conditions paved roads are converted to unpaved.
20-05/Topic 46-14 Practices for High-Tension Cable Barrier
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 490: Practice of Rumble Strips and Rumble Stripes documents current practices used by states installing rumble strips and rumble stripes. The report details and explores variations in state highway agency practices in terms of design, criteria, and locations for installation, maintenance, perceived benefits, communication of benefits, and what is considered as important issues.
20-05/Topic 46-15 Life Cycle Cost Analysis for Management of Highway Assets
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 493: Practices for High-Tension Cable Barriers reports on the current state of the practice for high-tension cable barriers (HTCB) used in the medians of access-controlled roadways in the United States. Information on high-tension cable barrier systems related to state agency specifications, special provisions, design standards, and installation and maintenance concerns was collected. Because all of the HTCB systems currently eligible for use on public roads in the United States are proprietary, information was also obtained from each of the manufacturers of these systems.
20-05/Topic 46-16 Minimizing Roadway Embankment Damage from Flooding
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 494: Life-Cycle Cost Analysis for Management of Highway Assets documents the state of the practice of life-cycle cost analysis (LCCA) and risk-based analysis into state highway agencies' asset management plans for pavements and bridges on the National Highway System. The objective of this project was to develop an inventory of quantitative asset-level, project-level, or corridor-level processes and models for predicting life-cycle costs associated with the preservation and replacement of highway assets. The report includes a literature review, a survey of highway agencies, and case studies that document specific highway agency experiences with LCCA.
20-05/Topic 46-17 Training and Certification of Highway Maintenance Workers
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 496: Minimizing Roadway Embankment Damage from Flooding documents the state-of-the-practice on how the transportation community is protecting roadways and mitigating damage from inundation and overtopping. This report highlights major issues and design components specific to roadway embankment damage from flooding. It documents the mechanics of damage to the embankment and pavement, and the analysis tools available. The probable failure mechanisms are identified and various design approaches and repair countermeasures are highlighted.
20-05/Topic 47-01 Control of Concrete Cracking in Bridges
TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 483: Training and Certification of Highway Maintenance Workers documents front-line maintenance worker training and certification practices for highway transportation agencies in the United States and Canada. The report includes the types of topics being addressed by training and certification programs, the delivery methods used to provide the training, the sources of instruction, and whether material-sharing relationships are being utilized to access training. In addition, the report captures how training is related to performance and the incentives being used by state and provincial agencies to encourage front-line maintenance workers to complete training.
20-05/Topic 47-02 Alternate Design/Alternate Bid Process for Pavement Type Selection
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 500: Control of Concrete Cracking in Bridges provides information on methods used to control concrete cracking in bridge superstructures and substructures, and on the influence of cracking on long-term durability. Cracking of concrete in bridges continues to be a concern for bridge owners, particularly with bridge decks exposed to severe environments. The control of cracking for aesthetic, durability, and structural reasons becomes increasingly important as service-life goals are extended and higher-strength concrete, higher-strength reinforcement, and different types of reinforcement are used in bridge construction.
20-05/Topic 47-03 Current Practices and Guidelines for the Reuse of Bridge Foundations
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 499: Alternate Design/Alternate Bid Process for Pavement-Type Selection documents the state of the practice in alternate design/alternate bid (ADAB) for pavement-type selection by highway agencies. ADAB is a contracting technique that allows the pavement-type selection decision to be made as part of the procurement process. Contractors are permitted to bid their preferred pavement-type alternative using real-time market pricing for the paving materials.
20-05/Topic 47-04 Leveraging Technology for Transportation Agency Workforce Development and Training
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 505: Current Practices and Guidelines for the Reuse of Bridge Foundations provides guidance on reusing bridge foundations, a sustainable option for many bridge replacement and rehabilitation efforts that can result in time and cost savings as well as reduced mobility impacts and environmental benefits. However, foundation reuse presents significant challenges, including uncertainties in existing foundation condition, remaining service life, and capacity. This synthesis documents current practices and guidelines used by transportation agencies for the reuse of bridge foundations.
20-05/Topic 47-05 Data Management and Governance Practices
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 503: Leveraging Technology for Transportation Agency Workforce Development and Training documents how state and local transportation agencies are using information and communication technologies (ICT) to train their workforce. The report explores the planning and resources required to implement and maintain a training and development program and assists agencies that are considering ways to implement, improve, or expand ICT-supported training programs.
20-05/Topic 47-06 Strategic Program Delivery Methods
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 508: Data Management and Governance Practices develops a collection of transportation agency data management practices and experiences. The report demonstrates how agencies currently access, manage, use, and share data.
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 504: Strategic Program Delivery Methods explores holistic approaches to maximizing the benefits of time and cost savings when delivering transportation programs, rather than delivering individual projects. While a considerable amount of published research has focused on the process of selecting an optimal project delivery method, this report documents how implementing a variety of delivery methods strategically for a program of projects can improve the delivery of the entire program.
20-05/Topic 47-07 Evolving Debt Finance Practices for Surface Transportation
20-05/Topic 47-08 Pavement Management Systems: Putting Data to Work
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 513: Evolving Debt Finance Practices for Surface Transportation explores a variety of debt mechanisms and tools to finance transportation infrastructure investment. The amount of debt and frequency of issuance vary substantially across states. In most states, provisions included in constitutions or statutes (or combinations of the two) govern the level and form of debt issuance. As well, many states have formal policies that govern debt issuance and management. The study documents new developments in flexible finance tools, including those offered by the federal government.
20-05/Topic 47-09 Practices for Establishing Contract Completion Dates for Highway Projects
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 501: Pavement Management Systems: Putting Data to Work documents current pavement management practices in state and provincial transportation agencies. The report focuses on the use of pavement management analysis results for resource allocation, determining treatment cost-effectiveness, program development, and communication with stakeholders.
20-05/Topic 47-10 Resource Allocation of Available Funding to Programs of Work
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 502: Practices for Establishing Contract Completion Dates for Highway Products documents current methodologies and procedures used by state transportation agencies to estimate contract time for various highway project delivery methods. Establishing contract time is an important part of the highway project development process because it directly impacts project costs, the public, and risk for contractors.
20-05/Topic 47-12 Use of Fiber Reinforced Polymers in Transportation Infrastructure
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 510: Resource Allocation of Available Funding to Programs of Work explores the decision-making process in state departments of transportation (DOTs) and how they determine resource allocation among different programs. The report documents current processes, techniques, tools, and data used to evaluate and select funding allocations around the country.
20-05/Topic 47-13 Relationship Between Chemical Makeup of Binders and Engineering Performance
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 512: Use of Fiber-Reinforced Polymers in Highway Infrastructure documents the current state of the practice in the use of fiber-reinforced polymers (FRPs) in highway infrastructure. The synthesis identifies FRP applications, current research, barriers to more widespread use, and research needs. The objectives of the study are to synthesize published literature on FRP materials in highway infrastructure and to establish the state of current practice of FRP applications in transportation agencies.
20-05/Topic 47-14 Effective Utility Coordination: Application of Research and Current Practices
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 511: Relationship Between Chemical Makeup of Binders and Engineering Performance documents the current practices of departments of transportation (DOTs) in the selection of the chemical composition of a binder used in pavement applications. The study provides information about the selection of binders and postproduction additives and modifiers, as well as corresponding engineering performance.
20-05/Topic 47-15 Traffic Signal Preemption at Intersections near Highway-Rail Grade Crossings
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 506: Effective Utility Coordination: Application of Research and Current Practices documents the state of the practice regarding utility coordination. The objective of the project was to determine how previous research has been incorporated into current practice and compile information about how transportation agencies and utility stakeholders are scoping, conducting, and managing effective utility coordination. The report documents the core elements of effective utility coordination, as reported by state transportation agencies (STAs); current practices to manage consultant-led utility coordination, both stand-alone and those incorporated into design contracts; and current practices to perform in-house utility coordination.
20-05/Topic 47-16 Highway Worker Safety
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 507: Traffic Signal Preemption at Intersections Near Highway–Rail Grade Crossings documents the current practices of traffic signal preemption deployed at intersections adjacent to railway grade crossing in both the United States and Canada. The study provides information on practices dealing with traffic signal preemption, maintenance, funding, and operations.
20-05/Topic 47-17 Statewide and MegaRegional Travel Forecasting Models: Freight and Passenger
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 509: Highway Worker Safety identifies how state departments of transportation (DOTs) implement policies using highway worker safety and health data to reduce injuries and manage risk. The report is a synthesis of current proactive safety practices that will be useful when developing or updating policies, programs, or tools to minimize injuries, fatalities, and risk. The study also identifies gaps in knowledge and future research needs.
20-05/Topic 48-01 Practices for Preventing Roadway Departure Crashes
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 514: Statewide and Megaregional Travel Forecasting Models: Freight and Passenger documents current practices and emerging trends with travel forecasting models. The report explores the motivation for and capabilities of statewide and megaregion models, options for extending them and challenges states face doing so, data requirements, how they are used and integrated with other models, institutional constraints, and emerging trends and methods. Several related issues were investigated as well, including performance monitoring, alternative forecasting approaches, and how states are addressing hot topics such as pricing and congestion, multi-state corridors, and new transportation modes.
20-05/Topic 48-02 Tack Coat Specifications, Materials, and Construction Practices
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 515: Practices for Preventing Roadway Departures identifies and summarizes practices being used by state departments of transportation (DOTs) to prevent roadway departure crashes and to identify the data-driven advantages and disadvantages of these practices. More than half of all traffic fatalities result from roadway departure crashes. This type of crash occurs after a vehicle crosses an edge line or centerline or otherwise leaves the traveled way. A variety of engineering strategies, often referred to as countermeasures, have been implemented by state and local agencies to prevent roadway departure crashes and reduce the severity of injuries if crashes do occur. Appendices A through F have been combined into one file and are available separate from the report.
The goal of this synthesis is to provide an overview of the current state of practice regarding tack coat specifications, materials, and construction practices. This information will aide state agencies as they review their current practices regarding tack coats, and assess what changes to their current specifications should be implemented. In addition, this study will help agencies identify gaps in their current specifications and practices and provide them with research information necessary to ensure a sufficient bond between subsequent pavement lifts.
20-05/Topic 48-03 Corrosion Protection for Extending Steel Bridge Service Life
Corrosion is one of the most often-cited problems with steel bridges. The need for a synthesis study on this topic is immediate. Owners are replacing a large number of Interstate era bridges and building significant numbers of new bridges and transportation structures. Now is the time to choose materials, coatings, and details wisely and develop and implement effective long term care and maintenance plans for newly constructed bridges and transportation structures.
20-05/Topic 48-04 Staffing for Alternative Contracting Methods
The objective of this synthesis is to identify effective practices for establishing staffing levels for Alternative Contracting Methods (ACM) projects.
20-05/Topic 48-05 The Renewal of Stormwater Systems Using Trenchless Technologies
The objective of this synthesis is to summarize available trenchless technologies being used for the installation and rehabilitation of stormwater conduits, and document successful practices for all trenchless technologies used for the installation and rehabilitation of stormwater conduits.
20-05/Topic 48-06 Integrated Transportation and Land Use Models
The objective of this project is to develop a synthesis of integrated transportation and land-use models for use by planning agencies (DOTs, MPOs, etc.). The project will result in a document that allows planning agencies to identify the type of integrated model that fits their needs.
20-05/Topic 48-07 Investment Prioritization Methods for Low Volume Roads
20-05/Topic 48-08 Connected Work Zones - Integrating Technology into Work Zones, Vehicles, and Equipment to Improve Worker, Driver, Pedestrian, and Bicycle Safety
20-05/Topic 48-09 Integration of Roadway Safety Data from State and Local Sources
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 521: Investment Prioritization Methods for Low-Volume Roads documents current practices used by transportation agencies to make investment decisions about low-volume roads. Current transportation asset management practices for low-volume roads typically use asset condition, traffic, and safety metrics to prioritize investment decisions for preservation, maintenance, repair, and replacement projects. However, these metrics do not fully measure the significant value for the wider economy and society that low-volume roads can provide. This publication also addresses the challenges that decision makers may face to communicate the value of such investments to stakeholders in an era of limited funds and constantly changing demands on the transportation system.
The purpose of this study is to document the ways in which transportation agencies are working with local agencies to obtain data from the local level and avoid duplication in data collection activities.
20-05/Topic 48-10 Aggregate Quality Requirements for Pavements
The objective of this synthesis is to document and summarize state DOT requirements for aggregate quality for pavements, both natural (quarried) and recycled. The study will cover the use of locally available aggregate sources, current production experiences and selection practices, typical value ranges for aggregate tests related to their performance (e.g., LA abrasion, strength), as well as design procedures aimed at comparing performance results in various types of construction and sustainable field applications.
20-05/Topic 48-11 Practices in One Lane Traffic Control on a Two-Lane Rural Highway
The objective of this synthesis is to identify effective practices for establishing two-way, two-lane traffic control. The synthesis will explore public and industry outreach efforts that were used successfully by transportation agencies in implementing the delivery of two-way, two-lane traffic control aspects projects, as well as barriers to implementation of the recommended effective practices.
20-05/Topic 48-12 Inertial Profiler Certification for IRI Measurements
The study will determine the state of practice of certification of inertial profilers at the national and international levels.
20-05/Topic 48-13 Resilience in Transportation Planning, Engineering, Management, Policy, and Administration
The study will help transportation practitioners prepare and plan for, absorb, recover from, and more successfully adapt to decreases in functionality no matter what the cause, scale, or duration. It is expected that with this information practitioners will be better informed and guided on ways to “working smarter” by showing how the needs of resilience (many of which are already taking place) can be better organized, understood, and worked into a comprehensive business operations.
20-05/Topic 48-14 Analyzing Data for Measuring Transportation Performance by State DOTs and MPOs
The goal of this synthesis project is to better understand how State DOTs and MPOs are currently analyzing data for managing transportation performance as part of anticipated changes to the Federal program or current performance-based programs an agency may have implemented.
20-05/Topic 48-15 How Transportation Agencies Assess the Value of Added Capacity Highway Projects versus Other Modal Projects and Strategies
This synthesis study will summarize the methods that transportation providers use to calculate the value and benefit of different types of transportation projects to determine the best use of public funds for reducing congestion, improving commute times, or moving freight.
20-05/Topic 48-16 Construction and Rehabilitation of Concrete Pavements under Traffic
A common misconception about the construction of new concrete roads, concrete overlays or major rehabilitation is that they cannot be effectively done under traffic. Advancements in materials, equipment, placement techniques and project coordination have proven this not to be the case. There are a great number of projects that have been constructed under varying levels of traffic ranging from temporary closures to maintaining a high level of live traffic adjacent to or through the project.
20-05/Topic 49-01 Prioritization of Freight Investment Projects
The product of this research will be a synthesis report that provides an overview of the current state of freight investment prioritization and methodology. Specific technical methods, data sources, procedural guidance and case studies will be collected to provide transportation agencies with current information on developing and implementing effective prioritization procedures.
20-05/Topic 49-02 Emerging Technologies for Construction Delivery
An important part of this synthesis report will be to document the barriers that are preventing emerging technologies from becoming industry standards. Knowing the barriers to adoption of these technologies will help the audience of the report prepare adequate budgets and implementation plans for incorporating these technologies in their projects
20-05/Topic 49-03 Bridge Demolition Practices
The objective of this synthesize is to document practices used by owners to manage and administer bridge demolition requirements within construction projects. This would include the methods of communicating project specific needs in the form of specifications, design details, stability requirements, review types, contractor responsibility, owner oversight, and acceptance.
20-05/Topic 49-04 Very Short Duration Work Zone Safety for Maintenance and other Activities
The objective of the proposed study is to synthesize the current state of practice on set-up of work-zone for very short-term activities, where the traffic control set up may take longer than the actual maintenance or very short term duration activities. The state of practice review should be designed to identify factors that most commonly contribute to work-zone injuries and fatalities
20-05/Topic 49-05 Impact of Asphalt Materials Lift Thickness on Pavement Quality
The objective of this synthesis is to examine agency policy for lift thickness and minimum compaction requirements on surface layers, the reasons for these policies and minimums, exceptions that may exist to established policy, and recorded service life, both with respect to structural performance and smoothness.
20-05/Topic 49-06 Design and Maintenance Practices for Urban Freeway Roadside Vegetation
The objective of this synthesis is to document the extent and magnitude of problems related to urban freeway roadside maintenance for state departments of transportation and to identify solutions that states have found to be effective. Highlighting examples of sustainable solutions would be of benefit in areas struggling with this aspect of highway maintenance operations.
20-05/Topic 49-07 Managing Transportation Research Programs
NCHRP Synthesis to identify existing resources, desired individual skill sets, core competencies, and structures that are in place for DOTs, universities and agencies to manage and conduct transportation research, especially federally-funded research
20-05/Topic 49-08 Pedestrian Safety Relative to Traffic Speed Management
The objective of this synthesis is to document information on pedestrian crashes relative to traffic speed in urban core areas. The report will gather information on reported impact speeds for pedestrian collisions. The synthesis will also document key pedestrian safety policies that have been implemented in support of Vision Zero, a strategy to eliminate all traffic fatalities and severe injuries, while increasing safe, healthy, and equitable mobility.
20-05/Topic 49-09 Concrete Technology for Transportation Applications
The product of this study will be a synthesis report that provides an overview of current available concrete technologies and how they can be used or further improved for various transportation applications.
20-05/Topic 49-10 Transportation Workforce Planning and Development Strategies
The objective of the study is to synthesize the current state of practice associated with the implementation of surface transportation workforce development strategies. A special effort will be made to identify workforce development strategies to help build career pathways in surface transportation for young adults, second career professionals, veterans, and encore careerists. Surface transportation for the purposes of this project would include motorized (e.g. automobiles, trucks, buses, rail cars) and non-motorized (e.g. cycling and walking) modes.
20-05/Topic 49-11 Practice for Online Public Involvement
This synthesis will provide a snapshot of current practice regarding online participation tools being used by transportation agencies today. It will also summarize results of these tools. Information will be gathered by a literature review and survey of state DOTs.
20-05/Topic 49-12 Seismic Design of Non-conventional Bridges
Prior to initiating a formal NCHRP research project, a synthesis of current seismic design practices for non-conventional bridges will be conducted to address a wide variety of geographic regions and structure types
20-05/Topic 49-13 Leveraging Private Capital for Infrastructure Renewal
The objectives of this synthesis are: (1) to identify and document the use of P3 and DBF in the transportation industry; (2) to compile, categorize and synthesize the experiences and lessons learned from financial markets and construction experts associated with these procurement methods; (3) to categorize, evaluate and document the lessons learned in a manner that will provide a useful primary resource for contracting entities or for refining further research in the topic; (4) to evaluate pros and cons in experiences as to how this delivery approach might have untapped benefits for transportation investments.
20-05/Topic 49-14 Methods to Acquire Proprietary Data for Transportation Applications
The objective of this research project is to investigate the use of non-traditional data sources for conducting highway capacity and quality of service analysis in three areas: field measurement of performance measures, local calibration of HCM models, and suitability to support validation of existing HCM models.
20-05/Topic 49-15 Automated Pavement Condition Surveys
The objective of this synthesis is to document agency practices, challenges, and success in conducting automated pavement condition data collection surveys. The study is intended to showcase successful practices, integration of automated data collection into pavement management systems, and efforts needed for reporting pavement condition according to the new federal transportation bill.
20-05/Topic 50-01 Improving Geotechnical Design Efficiency and Reducing Construction Uncertainties and Delays with Advanced Geophysical Methods
The objective of this synthesis is to provide an updated matrix of geophysics techniques for each application, as well as to provide background, and training resources for geophysical methods that have consistently yielded quantifiable value through improvements to design efficiencies and reductions in construction risks.
20-05/Topic 50-02 Highway Hydraulic Engineering State of Practice
The objective of this synthesis is to document significant changes that state DOTs have made over the past decade to their hydraulic engineering policies. The study will also examine the trends and factors driving these changes.
20-05/Topic 50-03 Use of Weigh-in-Motion Data for Improving Pavement and Bridge Designs, Weight Enforcement, and Freight Logistics
The objective of this synthesis is to document how and where DOTs are using WIM data.
20-05/Topic 50-04 Utility Pole Safety and Hazard Evaluation Approaches
20-05/Topic 50-05 Incorporating Access Management into Local Ordinances and Planning
The objective of this synthesis is to identify STA policies related to roadside utility pole hazards and highlight effective practices. Information to be gathered will include but not be limited to:
• How STAs identify, evaluate, and address utility pole hazards
• Effective approaches to improve roadside safety in regard to utility pole location
• Recent efforts put in place by STAs to address the safety concerns posed by roadside utility poles
• A review of policies regarding utility placements and devices accommodated, specified safety mechanisms for poles on STA right-of-way, and STA evaluation and resolution approaches of existing utility facilities posing hazards
• Solutions states are using to evaluate and resolve the utility pole hazards.
The objective of this synthesis is to document local zoning ordinances, site design regulations, and other practices that support access management. The synthesis will benefit local governments wishing to incorporate access management into their land planning processes.
20-05/Topic 50-06 Recent Advances in Unstable Slope Instrumentation and Monitoring
The objective of this synthesis is to document the current state of practice for geotechnical instrumentation and monitoring for landslides and unstable slopes.
20-05/Topic 50-07 Electronic Tracking, E-Ticketing, of Materials for Construction Inspection
The objective of this synthesis is to identify state DOTs that are using material tracking technology and provide an overview of the implementation of these technologies to date and lessons learned that identify success factors.
20-05/Topic 50-08 Emerging Challenges to Tolling on Managed Lanes
The objective of this synthesis is to identify challenges state DOTs are confronted with related to system management issues and public concerns and acceptance.
20-05/Topic 50-09 Performance Based Pavement Warranty Specifications
The objective of this synthesis is to document the use and effectiveness of performance-based pavement warranties by DOTs.
20-05/Topic 50-10 Availability of Pedestrian Infrastructure Data For Routing and Network Analysis
The objective of this synthesis is to document the state of the art in collecting, managing, delivering, and using sidewalk and other pedestrian infrastructure data.
20-05/Topic 50-11 Alternative Intersection Design and Selection
The objective of this synthesis is to identify the conditions under which departments of transportation (DOTs) have successfully implemented alternative intersection design decisions, the critical factors in making alternative intersection design decisions, and considerations related to congestion, pedestrian movement, and right-of-way requirements.
20-05/Topic 50-12 How Was it Built? State of Practice for As-Builts Plans on Highway Projects
The objective of this synthesis is to evaluate the state of the practice for as-built plans for highway projects.
20-05/Topic 50-13 Design, Estimation, and Contracting Rock Slope Scaling Adjacent to Highways
The objective of this synthesis is to document current practices for rock slope scaling adjacent to highways.
20-05/Topic 50-14 Practices for the Fabrication of Hot Mix Asphalt Samples for Testing in Laboratories
The objective of this synthesis is to document state transportation agency procedures with respect to laboratory fabrication of asphalt concrete mixtures.
20-05/Topic 50-15 Asset Management Approaches to Identifying and Evaluating Assets Damaged Due to Emergency Events
The objective of this synthesis is to document current practices by state DOTs for evaluating repair and reconstruction alternatives that may reduce future emergency funding needs in areas with recurring damage.