Practices to Manage Traffic Sign Retroreflectivity (2012) / Chapter Skim
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Pages 14-21
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From page 14... ...
Some agencies did not employ a secondary method and others combined two or three. For example, one agency used visual nighttime inspection as the primary means for identifying inadequate signs; however, it also had a sign inventory system to better manage resources and collected control sign measurements to monitor sheeting material longevity.
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From page 15... ...
State DOT s Local Agencies State DOT s Nighttime Inspection 6 M easured Retroreflectivity 2 0 0 0 Expected Sign Life 1 1 4 1 1 Blanket Replacemen t 3 5 4 0 C ontrol Signs 2 2 0 7 5 5 5 0 * The local agencies include towns, cities, counties, and the one toll road agency.
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From page 16... ...
Consequently, the agency elected to implement an expected sign life method in an attempt to save adequate signs as opposed to wasting resources in a countywide blanket replacement. One of the benefits of visual nighttime inspection cited most often was maximizing sign service life.
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From page 17... ...
The measurements would help to prioritize immediate sign replacements and the updated information would be used when establishing an expected sign life system where future replacements are based on service life periods. expected SigN life Of all the sign retroreflectivity maintenance methods listed in the MUTCD, the expected sign life method was found to be used the most often.
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From page 18... ...
The agency acknowledged that signs could last longer than the warranty periods; however, it was more important to the agency to reduce liability than try to extend sign service life. coNtrol SigNS The control signs method was another approach that few agencies considered and only two agencies selected it as a primary means of replacing signs.
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From page 19... ...
retroreflectivity measurements were collected every six months and readings were compiled to analyze sign deterioration rates. The control signs test deck helped to establish an appropriate service life period for the DOT's expected sign life method.
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From page 20... ...
Expected sign life systems are long-term strategies, but a large part of that investment comes at the beginning during the initial sign data collection process. Each agency has created its initial sign inventory and gathered the data differently.
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From page 21... ...
based on the responses from this effort, it is clear that there are many advantages of developing and using a sign inventory system that go beyond simply managing sign retroreflectivity. Most agencies use their systems for the potential planning and resource management capabilities.
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