Reflectivity Retention of Reflective Raised Pavement Markers

摘要

The report is the second in a series of four and it presents the methodology and results of two studies investigating the reflectivity of raised pavement markers and raised traffic buttons. A suggested maintenance procedure to assure positive route guidance is described and discussed. The study points out that markers lose approximately ninety percent of their initial reflectance within the first year. Markers remain effective with as little as .15 candlepower/foot-candle when at least eighty percent of the markers remain other parameters such as headlamps, trucks, and color of markers are discussed.