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.
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.
|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|
|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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