Quantifying Safety Performance of Driveways on State Highways
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2012-08-01
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Edition:Final report.
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Abstract:This report documents a research effort to quantify the safety performance of driveways in the State of Oregon. In
particular, this research effort focuses on driveways located adjacent to principal arterial state highways with urban or
rural designations. This report includes safety performance functions (SPFs) that can be used to evaluate the safety
impacts of various access management and driveway-related configurations on Oregon arterial corridors. The project
team developed these safety metrics using statistical models and methodologies similar to those outlined in the
Highway Safety Manual (HSM) published in 2010 by the American Association of State Highway and Transportation
Officials (AASHTO). Instead of using a base condition SPF that included only segment length and traffic volume and
then would need companion CMFs to fully analyze a corridor, the project team developed full model SPFs that do not
require any additional adjustments. The resulting models varied for urban versus rural conditions, but type of land use
and traffic volume were two consistently significant variables observed for both models. A companion “smart
spreadsheet” accompanies this report to assist readers with implementation of the procedure.
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