United States Department of Transportation
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Research and recommendations for a statewide sign retroreflectivity maintenance program.
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2012-04-01
[PDF-1.92 MB]
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Alternative Title:Project title: Development of a statewide sign maintenance program
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Edition:Technical report; Sept. 2009-Aug. 2011.
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Abstract:This study evaluated TxDOT's current sign retroreflectivity maintenance practices, assessed their
effectiveness, and recommended statewide sign retroreflectivity maintenance practices that could be easily
and effectively implemented to ensure that TxDOT would be in compliance with the new MUTCD language
related to minimum sign retroreflectivity. The researchers measured the retroreflectivity of almost 1400
signs across the state to assess the effectiveness of TxDOT's current practices, evaluated a mobile sign
retroreflectivity measurement technology, visited district and maintenance offices across the state, studied
the effectiveness of using the calibrated sign and comparison panel procedures of the visual nighttime sign
inspection maintenance method, developed a standardized form for making and documenting nighttime
inspection, and made recommendations for changes in TxDOT's current sign retroreflectivity maintenance
practices. Researchers concluded that TxDOT's current practices are quite effective compared to the
minimum retroreflectivity levels in the 2011 Texas MUTCD. Three specific recommendations are provided
that will bring TxDOT's current practices into compliance with the 2011 Texas MUTCD. First, TxDOT
should provide calibration signs to the maintenance sections. Second, a standardized form should be used to
conduct inspections and document inspections. Finally, a training program should be implemented to
educate the inspectors on how to conduct the inspections and the importance of sign retroreflectivity.
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