Target Completion Date: June 30, 2010 Safety, Operations, and Traffic Engineering
A safety performance function is a mathematical relationship between the frequency of crashes by severity and causal factors on specific roads. For example, crashes for a given time period can be estimated based on vehicle exposure. For a highway segment, exposure can be measured by the number of vehicles exposed and the distance for which they are exposed.
By comparing actual crashes on a segment of road to that obtained from the safety performance function, the potential for safety improvement can be determined.
The purpose of this study is to develop a set of safety performance functions for various conditions on two-lane highway segments and intersections that can be used to prioritize of the need for safety improvement projects in Virginia.
Last updated: July 5, 2023
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