Where can I find information on crash modification factors?

The CMF Clearinghouse has lots of good information on how to improve safety. As stated by the Clearinghouse:

A crash modification factor (CMF) is used to compute the expected number of crashes after implementing a countermeasure on a road or intersection. The Crash Modification Factors Clearinghouse provides a searchable online database of CMFs along with guidance and resources on using CMFs in road safety practice. It also provides guidance to researchers on best practices for developing high quality CMFs.

We recommend only using CMFs with 4 or 5 stars unless you read the full report that was used to develop the factor.

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This work by the Cornell Local Roads Program (CLRP) is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License.