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Minimum Retroreflectivity Levels for Blue and Brown Traffic Signs.
| 题名： | Minimum Retroreflectivity Levels for Blue and Brown Traffic Signs. |
| 作者： | holick, a. j. carlson, p. j. |
| 关键词： | visibility, luminance, visual complexity, glare, vehicle lighting, recommendations, legibility, traffic safety, visual perception, traffic control devices |
| 摘要： | In 2003, the Federal Highway Administration published research recommendations for minimum maintained retroreflectivity (MR) levels for traffic signs. The recommendations included most sign types but not white-on-blue signs or white-on-brown signs. In addition, the 2003 recommended maintained retroreflectivity levels were based on conditions representing dark rural environments. This report describes the research activities and consequent findings related to the development of recommendations for MR levels for white-on-blue signs and white-on-brown signs. This report also includes an investigation related to MR levels needed for complex visual conditions that include glare from oncoming headlamps and fixed roadway lighting. The research used a summary of the pertinent literature to develop an experimental plan to produce luminance thresholds that could be used with a previously developed analytical model to develop a set of recommendations for MR levels for white-on-blue signs and white-on-brown signs. The results for the white-on-blue signs and the white-on-brown signs were integrated into one table that includes the current set of MR levels. Both legend and symbol signs were consolidated into the same recommendations because of similar requirements for luminance thresholds. / NOTE: Final rept. Jan 05-Dec 05. / Supplementary Notes: Sponsored by Federal Highway Administration, McLean, VA. Office of Safety Research and Development. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA. |
| 总页数： | u0822；52p |
| 报告类型： | 科技报告 |
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