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Impact of Minimum Retroreflectivity Values on Sign Replacement Practices
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1996-10-01
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[PDF-9.59 MB]
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Edition:Final Report: September 1995 - August 1996
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Abstract:In 1993, the FHW A proposed minimum levels of retroreflectivity for traffic signs. The minimum values are organized into four tables according to the color of the sign. Each table defines the minimum values as a function of different variables, such as type of sheeting, size of sign, and/or speed of road. This research study was conducted to evaluate various methods that the TxDOT could use to implement the minimum retroreflectivity values. The three basic methods evaluated in the research are: total replacement of all signs, sign inspection and replacement, and sign replacement based on a sign management system. The actual replacement of signs for each method could be done with state or contract forces. Research tasks included surveys of state traffic engineers, TxDOT districts, and TxDOT sign crews; investigations and measurements of sign retroreflectivity and service life; information gathering on sign management systems; an economic analysis of the relative cost-effectiveness of the methods; and an assessment of non-economic factors. The analysis found that the sign inspection and sign management methods have essentially the same costs, but that the sign management method can be implemented with fewer personnel. The sign management method also offers many other benefits that reach beyond those immediately concerned with sign replacement. The research recommends that TxDOT adopt a sign management system in order to implement the minimum retroreflectivity values.
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