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" ... to recommend specifications for optimum spacing of Snowplowable Raised Pavement Markers (SRPMs) along skip lane lines."--Page 5.
"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.