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"TRB's National Cooperative Highway Research Program (NCHRP) Report 518: Safety Evaluation of Permanent Raised Pavement Markers examines the safety performance of snowplowable permanent raised pavement markers on two-lane roadways and four-lane freeways"--Publisher's description.
The research reported here was undertaken to determine the feasibility of using raised pavement markers on interstate off-ramps in such a configuration that the driver will be alerted as a result of viewing an unexpected phenomenon. The results of this preliminary investigation show that the raised pavement marking system, consisting of a pattern of 45 markers, was effective in alerting drivers and would cause a wrong-way driver to realize his mistake according. Based on the results of this initial phase, it is recommended that the study be expanded by permanently placing raised markers at two or three interchange off-ramps for further study. It is anticipated that this recommendation will be implemented in the near future.
Effectiveness at two interstate off-ramps.
Under this research study, the effect of various delineation treatments on accident rates was assessed by analyzing accident data from more than 500 roadway sites in 10 States for tangent, winding and isolated horizontal curve sections on two-lane rural highways. Cost-benefit and cost models for evaluating specific delineation treatments were developed and guidelines formulated by executing the cost-benefit models for selected delineation treatments.
This manual describes the high-accident location analysis (HAL) system which will allow the user to identify, analyze, and correct high-accident locations.