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Publication Number: FHWA-HRT-13-044
Date: August 2013
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This report may be of use to traffic engineers and researchers who are concerned with the conspicuity of traffic signs.
The Manual on Uniform Traffic Control Devices advises that, “Signs should be placed on the right side of the roadway where they are easily recognized and understood by road users.” Guidance is provided on the spacing and prioritization of signs, and in some conditions, additional steps may be needed to ensure that signs are conspicuous. Engineering judgment is required when locating signs. However, little additional information is available to engineers to assist in making such judgments. The research described in this report was intended to develop scientific support for additional guidance on traffic control device conspicuity. The report concludes with guidance on sign conspicuity enhancement for practitioners and provides suggestions for additional research to advance the overall state of knowledge on sign conspicuity.
Monique R. Evans
Director, Office of Safety
Research and Development
This document is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The U.S. Government assumes no liability for the use of the information contained in this document. This report does not constitute a standard, specification, or regulation.
The U.S. Government does not endorse products or manufacturers. Trademarks or manufacturers’ names appear in this report only because they are considered essential to the objective of the document.
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Topics: research, safety
Keywords: research, safety, Conspicuity, Speed-limit sign, Warning sign, Sign detection, Sign recall, Eye tracking
TRT Terms: research, Safety and security, Safety, Transportation safety