Practices to Manage Traffic Sign Retroreflectivity (2012) / Chapter Skim
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Within participant responses, it was determined that the expected sign life method was the most selected primary and secondary method for replacing and managing signs; the second most common was visual nighttime inspection; however, agencies were somewhat conflicted about this method. Survey participants were typically divided into two groups: agencies that have used nighttime inspection and agencies that rejected it.
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This report concluded that survey participants were implementing a variety of primary and secondary methods for maintaining signs and ensuring retroreflectivity compliance. The expected sign life method was the most often selected followed by the visual nighttime inspection and blanket replacement methods.
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