Raised Pavement Marker (RPM) Assessment Using Highway Speed Mobile Retroreflectivity Technology
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2021-04-01
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Edition:Final Report, March 2019 – April 2021
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Abstract:The focus of this study was to configure a Laserlux G7 mobile retroreflectivity unit (MRU) to accurately and repeatably detect and measure the retroreflectivity of in-service raised pavement markers (RPMs). At this time, the Florida Department of Transportation (FDOT) assesses the quality of in-service RPMs as part of a visual inspection. Currently, the FDOT State Materials Office collects 25,000 lane miles of line-stripe pavement marking (PM) retroreflectivity data each year using MRUs. Since these MRUs were designed to measure PMs in units of RL (mcd/m2/lux), a primary objective of this study was to derive regression equations that correlate the industry standard units for RPMs [RI (mcd/lux)] and the RL values collected by the MRU. An additional complexity is that the MRU utilizes a 30-meter measurement geometry related to RL, and RI is calculated at a 220-meter measurement geometry.
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