The Crash Modification Factors Clearinghouse provides a searchable database of CMFs
along with guidance and resources on using CMFs in road safety practice.
FREQUENT SEARCHES: ROUNDABOUT | SIGNAL | PEDESTRIAN | SHOULDER | TSMO | BROWSE ALL

What are CMFs?

A crash modification factor (CMF) is used to compute the expected number of crashes after implementing a countermeasure on a road or intersection.

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Upcoming Webinar

Join transportation engineers, designers and planners on December 2 for “Understanding the Upcoming CMF Rating Transition and Exploring Real-World Applications of CMFs.”

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Change Ahead

The CMF Clearinghouse will transition to the CMF rating criteria developed as part of the NCHRP 17-72 project for the 2nd edition of the Highway Safety Manual.

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CMFs were last added to the clearinghouse on August 14, 2020.