Safety performance functions for intersections : final report, December 2009.
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2009-12-01
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By Persaud Lyon, Inc. ...
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Edition:Final report.
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Abstract:Road safety management activities include screening the network for sites with a potential for safety improvement (Network
Screening), diagnosing safety problems at specific sites, and evaluating the safety effectiveness of implemented
countermeasures. It is important that these activities be both efficient and methodologically sound, since resources would
otherwise be wasted on unnecessary treatments for safe elements and elements deserving of treatment would be left
untreated.
The state-of-the-art methodologies for conducting these activities make use of statistical models to predict expected accident
frequencies using traffic volumes and other site characteristics as the input to the models (known as Safety Performance
Functions or SPFs). CDOT’s research and safety engineers are in the forefront of national efforts to develop methods using
SPFs to screen large networks to find sites with a potential for safety improvement.
CDOT has previously developed SPFs to identify freeway and rural roadway segments that have the potential for accident
reduction. This report documents the data collection, modeling efforts, and findings of a research project to develop SPFs for
ten categories of intersections.
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