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.

LEARN MORE

Getting Started

Learn more about how to use this site in our User Guide section.

USER GUIDE

State CMF Lists

See the CMFs that various states have decided to use statewide to improve their consistency of practice.

VIEW LISTS

RECEIVE THE QUARTERLY EMAIL NEWSLETTER

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