Highlights Horizontal Curve Warning Pavement Markings in Pennsylvania were Evaluated. Empirical Bayes Before-After Analysis was Used. Multiple crash types and severities along horizontal curves were considered. Findings indicate that the pavement markings reduce run-off road crashes by 23–35 %.

    Abstract Roadway departure crashes contribute to a large proportion of fatal and injury crashes in the United States. These crash types are more likely to occur along horizontal curve sections of a roadway. Countermeasures that prevent vehicles from departing the roadway is one method to mitigate roadway departure crashes. Pennsylvania has deployed on-pavement horizontal curve warning markings in advance of horizontal curves on two-lane rural highways as a roadway departure crash reduction strategy. This study used an Empirical Bayes (EB) before-after study design to evaluate the safety effects of the horizontal curve warning pavement markings. A total of 263 treatment sites and more than 21,000 reference sites were included in the evaluation. Crash modification factors were developed for total, fatal plus injury, run-off-road, nighttime, nighttime run-off-road, and nighttime fatal plus injury crashes. The point estimates for each of these crashes ranged from 0.65 to 0.77 – the results were statistically significant for total and fatal plus injury crashes at the 95th-percentile confidence level.


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    Title :

    Empirical Bayes before-after evaluation of horizontal curve warning pavement markings on two-lane rural highways in Pennsylvania


    Contributors:


    Publication date :

    2020-08-07




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English