Crash Reduction Factors

A crash reduction factor (CRF) is the percentage crash reduction that might be expected after implementing a given countermeasure at a specific site. For example, the installation of centerline rumble strips on a two-lane roadway can expect a 14% reduction in all crashes and a 55% percent reduction in head-on crashes.

Centerline Rumble Strips

FHWA has developed a set of resources to assist practitioners in their decision-making process. These resources are developed around FHWA’s Office of Safety focus areas of intersection safety, pedestrian safety and roadway departure safety.

Resources

Desktop Reference for Crash Reduction Factors

Intersection Safety:
- Issue Brief: Traffic Signals
- Issue Brief: Toolbox of Countermeasures and Their Potential Effectiveness for Intersection Crashes

Pedestrian Safety:
- Issue Brief: Toolbox of Countermeasures and Their Potential Effectiveness for Pedestrian Crashes

Roadway Departure Safety:
- Issue Brief: Toolbox of Countermeasures and Their Potential Effectiveness for Roadway Departure Crashes

The CRFs presented in the Desktop Reference are a compilation of all the CRF information available to date; whereas, the CRF’s contained in the “Toolbox of Countermeasures” for intersection, pedestrian and roadway departure crashes contain the “best” available information on countermeasure effectiveness in terms of CRF’s.

The CRFs in this Desktop Reference may be periodically updated as new information becomes available. Therefore, we strongly encourage users to provide their feedback related to concerns or conflicts with current documents; clarifications of existing documents; and new ideas or countermeasures for the next release.

Program Contact

Karen Yunk
karen.yunk@dot.gov
609-637-4207

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