Guidelines for the Development and Application of Crash Modification Factors

National Academies of Sciences, Engineering, and Medicine

doi:10.17226/26408

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Guidelines for the Development and Application of Crash Modification Factors

(2022)

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Crash modification factors (CMF) provide transportation professionals with the kind of quantitative information they need to make decisions on where best to invest limited safety funds.

The TRB National Cooperative Highway Research Program's NCHRP Research Report 991: Guidelines for the Development and Application of Crash Modification Factors describes a procedure for estimating the effect of a proposed treatment on a site of interest.

Supplemental to the report are a CMF regression tool, a CMF combination tool, a slide summary, and an implementation memo.

Contributor(s): National Academies of Sciences, Engineering, and Medicine; Transportation Research Board; National Cooperative Highway Research Program; Daniel Carter; Raghavan Srinivasan; Frank Gross; Scott Himes; Thanh Le; Bhagwant Persaud; Craig Lyon; James Bonneson

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National Academies of Sciences, Engineering, and Medicine. 2022. Guidelines for the Development and Application of Crash Modification Factors. Washington, DC: The National Academies Press. https://doi.org/10.17226/26408.

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Publication Info

400 pages | 8.5 x 11 | DOI: https://doi.org/10.17226/26408

Chapters		skim
Front Matter	i-viii
Summary	1-3
Chapter 1 - Background	4-4
Chapter 2 - Research Approach	5-5
Chapter 3 - Findings and Applications	6-96
Chapter 4 - Conclusions and Suggested Research	97-99
References	100-102
Abbreviations	103-104
Appendix A - Procedure for Estimating the Effect of a Proposed Treatment at a Subject Site	105-188
Appendix B - Procedure for Estimating the Combined Safety Effect of Two Treatments	189-224
Appendix C - Guidelines for Developing Crash Modification Functions	225-320
Appendix D - User Guide for CMF Regression Software	321-334
Appendix E - User Guide for the CMF Combination Tool Spreadsheet	335-338
Appendix F - Enhancing Future CMF Research	339-360
Appendix G - Developing Consensus in Research About the Safety Effect of Manipulations	361-398

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