NCHRP 07-24 [Final]
Estimating the Value of Truck Travel Time Reliability
| Project Data
||Published as NCHRP Research Report 925|
Travel time reliability is frequently cited as an important metric for the trucking community and other users of truck freight services.While travel time reliability for all vehicles is commonly measured and reported as a percentile of average (mean) travel time, the value of truck travel time reliability needs to be incorporated into the truck freight benefit-cost estimation in order to better assess mobility projects and provide quantitative data for transportation project prioritization. While the importance of reliability is well established for passenger and freight travel, the value of reliability for truck freight system users is not. The recently published NCHRP Report 824: Methodology for Estimating the Value of Travel Time Reliability for Truck Freight System Users developed and demonstrated a methodology to estimate the value of travel time reliability, but was only a first step and provides limited data because of the low survey response rate. There is a need to develop and demonstrate an improved methodology to estimate the value of truck travel time reliability. The methodology should be applicable to any region, across a range of truck freight users and commodity types.
The objective of this research is to develop an improved framework for truck freight reliability valuation. The framework should include the methodology, modeling assumptions, analytical techniques, and tools developed in NCHRP Report 824 in order to assist transportation professionals and decision makers in the evaluation of proposed roadway infrastructure and operations investments. The research should address a wide range of issues related to the truck freight reliability valuation framework, such as, but not limited to:
- Addressing challenges and limitations of the NCHRP Report 824 framework;
- Proposing data collection methods (e.g., surveys, case studies, databases, interviews, shipping characteristics) to better inform the values and framework;
- Reviewing existing data sources (e.g., commercial establishment surveys, revealed preference surveys, vehicle probe data, commercial supply chain data providers);
- Developing processes that improve the framework, its model logic and structure, and parameter values;
- Reviewing applicability of the framework to different levels of reliability;
- Developing framework flexibility for use in various types of improvements (e.g., spot, local, corridor, regional);
- Developing an improved framework; and
- Demonstrating its application (e.g., using case studies, simulations, scenario planning).
A kick-off teleconference of the research team and NCHRP shall be scheduled within 1 month of the contract’s execution. The work plan must be divided into tasks, with each task described in detail. There must be an interim report and a face-to-face meeting with NCHRP to discuss the improved framework and the plan for applying the improved framework. The final deliverables shall include (1) the improved truck freight reliability valuation framework; (2) an updated electronic version of the tools with user’s guide; (3) a final report documenting the entire project, incorporating all other specified deliverables of the research; (4) an electronic presentation of the framework that can be tailored for specific audiences; (5) recommendations on needs and priorities for additional research; and (6) a stand-alone technical memorandum titled “Implementation of Research Findings and Products”.