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Highway safety practitioners were given a significant new tool in 2010 with the publication of the AASHTO Highway Safety Manual. In the HSM, crash modification factors (CMFs) were provided to estimate the safety effects for a variety of treatments or countermeasures.

The TRB National Cooperative Highway Research Program's NCHRP Web-Only Document 352: Crash Modification Factors in the Highway Safety Manual: Resources for Evaluation provides the appendices to NCHRP Research Report 1029: Crash Modification Factors in the Highway Safety Manual: A Review.

Supplemental to the document are a file that provides the list of CMFs rated with the NCHRP 17-72 rating system and a spreadsheet of legacy CMF Clearinghouse star ratings along with the NCHRP 17-72 ratings for all CMFs.

RESOURCES AT A GLANCE

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Suggested Citation

National Academies of Sciences, Engineering, and Medicine. 2023. Crash Modification Factors in the Highway Safety Manual: Resources for Evaluation. Washington, DC: The National Academies Press. https://doi.org/10.17226/27016.

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Publication Info

517 pages |  8.5 x 11 |  DOI: https://doi.org/10.17226/27016
Chapters skim
Front Matter i-iv
Appendix A Review of Procedures for Assessing CMF Quality 1-46
Appendix B CMF User Preferences and Practices 47-96
Appendix C CMF Rating System for the 2nd Edition of the HSM 97-107
Appendix D CMF Rating Summary for the 2nd Edition of the HSM 108-112
Appendix E Development of Crash Modification Functions for Improving Curve Delineation 113-125
Appendix F Development of Crash Modification Functions for Shoulder and Median Width 126-147
Appendix G Development of Crash Modification Functions for Adding a TWLTL to a Two-Lane Road 148-159
Appendix H Development of Crash Modification Functions for Conversion of Two-Way Stop-Controlled to All-Way Stop-Controlled at Four-Leg Intersections 160-168
Appendix I SPF Adjustment Factors for Segment SPFs from NCHRP Project 17-62 169-198
Appendix J SPF Adjustment Factors for Intersection SPFs from NCHRP Project 17-62 199-251
Appendix K Calibration of Prediction Models of Rural Segments for the 2nd Edition of the HSM 252-288
Appendix L Calibration of Prediction Models of Urban Segments for the 2nd Edition of the HSM 289-298
Appendix M Calibration of Prediction Models of Rural and Urban Intersections for the 2nd Edition of the HSM 299-374
Appendix N Development of a Roadside Design CMF for Rural Two-Lane Two-Way Roads 375-413
Appendix O HSM Implementation of a Proposed Roadside Design CMF for Rural Two-Lane Two-Way Roads 414-456
Appendix P CMF Gap Analysis 457-512

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