登入選單

返回Google圖書搜尋

Sign Luminance Requirements for Various Background Complexities

Douglas J. Mace

出版	U.S. Department of Transportation, Federal Highway Administration, Research, Development, and Technology, 1985
URL	http://books.google.com.hk/books?id=O3UsAQAAMAAJ&hl=&source=gbs_api

註釋

The Federal standards (FP-79) for luminance of retroreflective materials for traffic signs are acceptance standards; they provide no differentiation based on driver need. Driver needs for sign luminance are of 3 types -- luminance for sign comprehension, luminance levels that define sign legibility, and luminance levels for sign conspicuity. This study was directed toward establishing, for different levels of scene complexity, luminance levels for conspicuity of yellow diamond warning signs at night. A procedure based upon rating sign locations on 4 scales was useful for identifying low complexity and high complexity scenes.