Serviceable pavement marking retroreflectivity levels : technical report.
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2009-03-01
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Alternative Title:Project title: Serviceable pavement marking retroreflectivity levels
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Edition:Technical report; Sept. 2006-Aug. 2008.
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Abstract:This research addressed an array of issues related to measuring pavement markings retroreflectivity, factors
related to pavement marking performance, subjective evaluation process, best practices for using mobile
retroreflectometers, sampling pavement markings, and best practices for a Pavement Marking Management
system. Tests conducted to assess subjective evaluation showed inconsistency in subjective retroreflectivity
evaluation when compared between different evaluations, marking color, and retroreflectivity levels.
Sensitivity testing on several factors that could potentially affect mobile retroreflectometer readings showed
that distance from which the measurements are taken and position across the measurement window seemed
to have the most significant impact on the mobile retroreflectivity measurements. The evaluation factors of
data acquisition, vehicle speed, and small changes in measurement geometry made no practical difference to
the measurement. However, constant speed provided best results. Based on the sensitivity testing this report
enlists some best practices for mobile retroreflectometer measurements. A methodology for combining
mobile retroreflectivity data with pavement information and plotting a map, color coded based on pavement
marking retroreflectivity level using GIS, are demonstrated in this project. This report also provides
discussion on other best practices for sampling and Pavement Marking Management system.
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