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Web-Only Document 92: Pavement Marking Materials and Markers: Real-World Relationship Between Retroreflectivity and Safety Over Time National Cooperative Highway Research Program Geni Bahar Maurice Masliah Tara Erwin Errol Tan iTRANS Consulting Richmond Hill, Ontario, Canada Ezra Hauer Toronto, Ontario, Canada Contractorâs Final Report for NCHRP Project 17-28 Submitted April 2006 NCHRP