| NCHRP 22-05 | Develop Performance Standards and Hardware for Low Service Level Guardrail Systems | Completed | |
| NCHRP 22-05A | Warrants for the Installation of Low Service Level Guardrail Systems | Completed | |
| NCHRP 22-06 | Roadside Safety Design for Small Vehicles | Completed | |
| NCHRP 22-07 | Update of "Recommended Procedures for Safety Performance Evaluation of Highway Appurtenances" | Completed | |
| NCHRP 22-08 | Evaluation of Performance Level Selection Criteria for Bridge Railings | Completed | |
| NCHRP 22-09 | Improved Procedures for Cost-Effectiveness Analysis of Roadside Safety Features | Completed | |
| NCHRP 22-10 | Updated Materials for a Traffic Barrier/Small Sign Support Hardware Guide | Completed | |
| NCHRP 22-11 | Evaluation of Roadside Features to Accommodate Vans, Mini-Vans, Pickup Trucks, & 4-Wheel Drive Vehicles | Completed | |
| NCHRP 22-12 | Guidelines for the Selection, Installation, and Maintenance of Highway-Safety Features | Completed | |
| NCHRP 22-12(02) | Selection Criteria and Guidelines for Highway Safety Features | Completed | |
| NCHRP 22-12(03) | Recommended Guidelines for the Selection of Test Levels 2 Through 5 Bridge Rails | Completed | |
| NCHRP 22-13 | Performance of Roadside Barriers | Completed | |
| NCHRP 22-13(2) | Expansion and Analysis of In-Service Barrier Performance Data and Planning for Establishment of a Database | Completed | |
| NCHRP 22-14 | Improvement of the Procedures for the Safety-Performance Evaluation of Roadside Features | Completed | |
| NCHRP 22-14(02) | Improved Procedures for Safety-Performance Evaluation of Roadside Features | Completed | |
| NCHRP 22-14(03) | Evaluation of Existing Roadside Safety Hardware Using Updated Criteria | Completed | |
| NCHRP 22-14(04) | Testing of Cable Median Barrier in a Narrow Ditch | Active | |
| NCHRP 22-15 | Improving the Compatibility of Vehicles and Roadside Safety Hardware | Completed | |
| NCHRP 22-16 | Development of an Improved Roadside Barrier System | Completed | |
| NCHRP 22-17 | Recommended Guidelines for Curbs and Curb-Barrier Combinations | Completed | |
| NCHRP 22-18 | Crashworthy Work-Zone Traffic Control Devices | Completed | |
| NCHRP 22-19 | Aesthetic Concrete Barrier and Bridge Rail Designs | Completed | |
| NCHRP 22-20 | Design of Roadside Barrier Systems Placed on MSE Retaining Walls | Completed | |
| NCHRP 22-20(02) | Design Guidelines for TL-3 through TL-5 Roadside Barrier Systems Placed on Mechanically Stabilized Earth (MSE) Retaining Walls | Active | |
| NCHRP 22-21 | Median Cross-Section Design for Rural Divided Highways | Final | |
| NCHRP 22-22 | Placement of Traffic Barriers on Roadside and Median Slopes | Final | |
| NCHRP 22-22(02) | Effectiveness of Traffic Barriers on Non-Level Terrain | Active | |
| NCHRP 22-23 | Criteria for Restoration of Longitudinal Barriers | Completed | |
| NCHRP 22-24 | Guidelines for Verification and Validation of Crash Simulations Used in Roadside Safety Applications | Completed | |
| NCHRP 22-25 | Development of Guidance for the Selection, Use, and Maintenance of Cable Barrier Systems | Completed | |
| NCHRP 22-26 | Factors Related to Serious Injury and Fatal Motorcycle Crashes with Traffic Barriers | Active | |
| NCHRP 22-27 | Roadside Safety Analysis Program (RSAP) Update | Completed | |
| NCHRP 22-28 | Criteria for Restoration of Longitudinal Barriers, Phase II | Active | |
| NCHRP 22-29 | Performance of Longitudinal Barriers on Curved, Superelevated Roadway Sections | Completed | The project was terminated due to the departure of several key staff. |
| NCHRP 22-29A | Evaluating the Performance of Longitudinal Barriers on Curved, Superelevated Roadway Sections | Completed | |
| NCHRP 22-29B | Evaluating the Performance of Longitudinal Barriers on Curved, Superelevated Off-Ramps | Active | |
| NCHRP 22-30 | In-Service Performance Evaluation of W-beam End Terminals | Completed | Completed - published as TRB Special Report 323 |
| NCHRP 22-31 | Recommended Guidelines for the Selection and Placement of Test Levels 2 through 5 Median Barriers | Active | |
| NCHRP 22-32 | Development of Methods to Evaluate Side Impacts for Next Edition MASH | Completed | |
| NCHRP 22-33 | Multi-State In-Service Performance Evaluations of Roadside Safety Hardware | Active | |
| NCHRP 22-34 | Determination of Zone of Intrusion Envelopes under MASH Impact Conditions for Barrier Attachments | Active | Research in progress. |
| NCHRP 22-35 | Evaluation of Bridge Rail Systems to Confirm AASHTO MASH Compliance | Active | |
| NCHRP 22-36 | Synthesis of the Performance of Portable Concrete Barrier Systems | Final | |
| NCHRP 22-36(01) | A Guideline for Connection Details Between Portable Concrete Barrier Segments | Final | NCHRP canceled this project and reallocated project funds to NCHRP Program |
| NCHRP 22-37 | Development of a MASH Barrier to Shield Pedestrians, Bicyclists, and Other Vulnerable Users from Motor Vehicles | Active | |
| NCHRP 22-38 | Development of MASH TL-3 Deflection Reduction Guidance for 31-inch Guardrail | Active | |
| NCHRP 22-39 | Guardrail Performance at Various Offsets from Curb MASH TL-3 Applications | Active | |
| NCHRP 22-40 | Update to AASHTO M 180-18 and Associated Highway Guardrail Specifications | Active | |
| NCHRP 22-41 | Proposed Modification to AASHTO LRFD Bridge Design Specifications, Section 13—Railing | Active | |
| NCHRP 22-42 | Impact Performance Assessment of Barrier Performance at High Speeds | Pending | |
| NCHRP 22-43 | Proposed AASHTO Guidelines for Implementation of MASH for Sign Supports, Breakaway Poles, and Work Zone Traffic Control Devices | Active | |
| NCHRP 22-44 | A Transportation Agency Data Collection Practice for Use with In-Service Performance Evaluations (ISPEs) | Active | |
| NCHRP 22-45 | Informing the Selection of Countermeasures by Evaluating, Analyzing, and Diagnosing Contributing Factors that Lead to Crashes | Active | Research underway. |
| NCHRP 22-46 | Human Factors Guidelines for Road Systems, Proposed 4th Edition | Pending | |
| NCHRP 22-47 | Incorporating Driver Behavior and Characteristics into Safety Prediction Methods | Active | Research underway |
| NCHRP 22-48 | Development of Crash Prediction Models for Short-Term Durations | Active | Research in progress. |
| NCHRP 22-49 | The Effect of Vehicle Mix on Crash Frequency and Crash Severity | Pending | |