Evaluation of traffic control devices : fifth-year activities.
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2009-02-01
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Alternative Title:Research project title: Traffic control device evaluation and development program
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Edition:Technical report; $b Sept. 2007¿Aug. 2008.
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Abstract:This project was established to provide a means of conducting limited scope evaluations of numerous traffic
control device issues. During the fifth, and final, year of the project, researchers conducted four activities:
improving the interface for the automated process for identifying the start and end of no-passing zones
developed during the fourth year, continuing the evaluation of the performance of lead-free yellow
thermoplastic pavement markings started at the end of the fourth year, continuing development of the Work
Zone Implementation Handbook, and creating an updated edition of the Sign Crew Field Book. The last two
of these activities produced stand-alone documents for Texas Department of Transportation (TxDOT) use.
The evaluation of lead-free thermoplastic found that the material performs well in most, but not all, areas.
The improved interface for the automated no-passing zone was tested in the field at two sites, and the results
indicate that the results are consistent with existing no-passing zone markings when considered for vertical
alignment only.
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