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Crash modification factors (CMFs) and functions are developed from historic crash data and help safety professionals estimate the expected safety impacts of specific roadway treatments. There has been a significant amount of research to develop CMFs for common safety strategies and many are included in the American Association of State and Highway Transportation Officials Highway Safety Manual and Federal Highway Administration CMF Clearinghouse.

NCHRP Research Report 1069: Estimating Effectiveness of Safety Treatments in the Absence of Crash Data: A Guide, from TRB's National Cooperative Highway Research Program, presents a guide for using alternative, or surrogate, measures of safety for developing CMFs and other quantifiable measures of safety performance.

Supplemental to the report is NCHRP Web-Only Document 369: Estimating Effectiveness of Safety Treatments in the Absence of Crash Data and an implementation memo.

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Suggested Citation

National Research Council. 2023. Estimating Effectiveness of Safety Treatments in the Absence of Crash Data: A Guide. Washington, DC: The National Academies Press. https://doi.org/10.17226/27281.

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Publication Info

70 pages |  8.5 x 11 |  DOI: https://doi.org/10.17226/27281
Chapters skim
Front Matter i-viii
Chapter 1 - Introduction 1-3
Chapter 2 - Vision for Surrogate Use in Practice 4-7
Chapter 3 - Surrogate Measure Definitions 8-18
Chapter 4 - Types of Data Collection Technologies for Surrogate Measurement 19-25
Chapter 5 - Study Design and Statistical Analysis Considerations 26-35
Chapter 6 - Types of Treatments for Evaluation with Surrogate Measures 36-39
Chapter 7 - Case Studies 40-56
Chapter 8 - Summary and Recommendations for Future Work 57-58
References 59-64

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