Countermeasures for Intersection Crashes

This online engineering PDH course presents estimates of the crash reduction that might be expected if a specific countermeasure or group of countermeasures is implemented with respect to intersection crashes.

The course presents crash reduction estimates as Crash Reduction Factors (CRFs). A CRF is the percentage crash reduction that might be expected after implementing a given countermeasure. One CRF is provided for each countermeasure. CRFs are presented in separate tables for signalization, geometric, and signs/markings/operational countermeasures. Traffic engineers and other transportation professionals can use the CRFs when asking the following types of question: Which countermeasures might be considered at the signalized intersection of Maple and Elm streets, an intersection experiencing a high number of total crashes and left-turn crashes? What change in the number of total crashes and left-turn crashes can be expected with the implementation of the various countermeasures?