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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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The CMF Clearinghouse transitioned to the CMF rating criteria developed as part of the NCHRP 17-72 project for the 2nd edition of the Highway Safety Manual on February 15, 2021.
CMFs were last added to the clearinghouse on Dec 06, 2022