State & local agencies are often faced the challenge of how to reduce the roadway departure crashes on rural two-lane highways within their jurisdictions. Roadway departure crashes are frequently severe and account for the majority of highway facilities. To improve their safety performance, the Missouri Department of Transportation (MoDOT) deployed a combined treatment of shoulder rumble stripes, shoulder widening (from 0 to 2 feet) and pavement resurfacing to more than 400 centerline miles of rural two-lane roadways. This study calculated the crash modification factors (CMF) for the RSR treatment using the Empirical Bayesian before/after study method. CMFs for combined treatments that include rumble strips have been reported in numerous studies. In this study, CMFs were calculated for the RSR treatment for 20 different crash categories (combinations of different crash severities and/or collision types). To calculate the CMFs, all roadway sites within the jurisdiction of MoDOT that received the RSR treatments were identified first. The RSR treatment was deployed to a total of 65 roadway segments in Missouri.
Safety Performance of Shoulder Rumble Stripes on Rural Roadways
ITE journal ; 87 , 3
2017
Article (Journal)
English
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