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原文传递 Experimental Study on Installing Tilted Signs to Prevent Snow Accretion on Sign Surfaces.

题名：	Experimental Study on Installing Tilted Signs to Prevent Snow Accretion on Sign Surfaces.
作者：	gibby, a. r. starnes, d. lumpkin, t.
关键词：	retroreflectivity, traffic control, changeable message signs, vehicle detectors, traffic signals, traffic management, visibility, nevada, research project, evaluation, warning devices, accident prevention, motorists
摘要：	Snow accretion and snow cover on signs can decrease or obliterate the message of traffic signs thereby causing a variety of problems for motorists. Motorists could miss a sign message altogether or could become so distracted trying to read a partially obscured message that they neglect the proper navigation of their vehicles. A completely missed sign message could be mere inconvenience such as missing a destination or street name. In contrast, if motorists miss seeing a sign massage such as 'stop' or 'Do Not Enter,' serious and undesirable safety consequences can occur and may be, in fact, likely. From a field trip to Japan, an executive of the Nevada Department of Transportation discovered the use of tilted signs, which appeared to be effective in Japan. Consequently, this research project was initiated. The primary purpose of this research was to evaluate the effectiveness of the vertically tilted sign in reducing the snow accretion under Nevada conditions. The top of the sign faces was tilted vertically toward the motorists. The research tasks were: (1) Installation of ground-mounted signs at various vertical angles 0, 3, 6, 9, and 12 degrees for three different directions-West, South and North; (2) Field evaluations that were documented with digital photographs during eight storms for two winters; and (3) Develop guidelines for when and how to install tilted sign. The major conclusion was that the amounts of snow accretion on a sign face decreases as the angle of tilt increases. / NOTE: Interim Research Rept. / Supplementary Notes: Sponsored by Federal Highway Administration, Carson City, NV. Nevada Div. / 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：	u0709；28p
报告类型：	科技报告