Publication Details

Crash modification factors in the Highway Safety Manual: A review

Type: book

Author(s): Srinivasan, Raghavan; Saleem, Taha; Gross, Frank; Le, Thanh; Himes, Scott; Porter, Richard J.; Bonneson, James A.; Persaud, Bhagwant; Lyon, Craig

Publisher: Transportation Research Board

Url: https://www.nap.edu/catalog/27015

Publication Date: 2023

Isbn: 978-0-309-69850-4

Doi: 10.17226/27015

Address: Washington, D.C.

Abstract: 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. This report presents a state-of-art guide on the proper selection and application of crash modification factors (CMFs). The report 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.