Crash Modification Factors in the Highway Safety Manual: A Review

National Academies of Sciences, Engineering, and Medicine

doi:10.17226/27015

VIEW LARGER COVER

Crash Modification Factors in the Highway Safety Manual: A Review

(2023)

Download Free PDF

Read Free Online

Buy from TRB.org

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 Research Report 1029: Crash Modification Factors in the Highway Safety Manual: A Review assesses the current criteria and existing process for evaluating and identifying the quality of CMFs for appropriate use with the HSM and presents proposed revisions to the criteria and process, including how existing and new CMFs may be incorporated in the HSM. The evaluation criteria are applied to identify and assess CMFs.

Supplemental to the report are NCHRP Web-Only Document 352: Crash Modification Factors in the Highway Safety Manual: Resources for Evaluation and a presentation on the work done to develop NCHRP Research Report 1029.

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

RESOURCES AT A GLANCE

Presentation

Topics

Suggested Citation

National Academies of Sciences, Engineering, and Medicine. 2023. Crash Modification Factors in the Highway Safety Manual: A Review. Washington, DC: The National Academies Press. https://doi.org/10.17226/27015.

Import this citation to:

Publication Info

50 pages | 8.5 x 11 | DOI: https://doi.org/10.17226/27015

Chapters		skim
Front Matter	i-viii
Summary	1-3
Chapter 1 - Introduction	4-6
Chapter 2 - Review of CMF Inclusion Criteria and Star Rating System in the CMF Clearinghouse	7-9
Chapter 3 - Determination of User Preferences and Practices	10-12
Chapter 4 - Recommendations for Incorporating CMFs in the HSM and Possible Framework for Practitioner Use	13-22
Chapter 5 - Development of CMFunctions for Select Treatments	23-26
Chapter 6 - Identification of Adjustment Factors for SPFs Estimated in NCHRP Project 17-62	27-28
Chapter 7 - Calibration of Prediction Models for Inclusion in the HSM2	29-31
Chapter 8 - Validation of SPF Adjustment Factors	32-34
Chapter 9 - Development of CMFs for Roadside Crashes on Rural Two-Lane Two-Way Roads	35-36
Chapter 10 - CMF Gap Analysis	37-38
Chapter 11 - Development of Guidance on the Selection, Application, and Development of CMFs	39-39
Acronyms and Abbreviations	40-40
References	41-42
Bibliography	43-46

What is skim?

The Chapter Skim search tool presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter. You may select key terms to highlight them within pages of each chapter.

Crash Modification Factors in the Highway Safety Manual: A Review

RESOURCES AT A GLANCE

Topics

Suggested Citation

Import this citation to:

Publication Info

What is skim?

Links