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原文传递 Communicating Changes in Horizontal Alignment

题名：	Communicating Changes in Horizontal Alignment
作者：	Lyles, R. W.; Taylor, W. C.
关键词：	Road curves##Highway design##Traffic control devices##Rural highways##Accident research##Research project##Speed reduction##Speed limits##Two lane roads##Accident risk forecasting##Warning signs##Pavement markings##Accident reduction##Traffic engineering##Highway safety##Guidelines##Recommendations##Horizontal alignment##
摘要：	This report presents the findings of a research project to develop guidelines for the use of traffic control devices for communicating changes in horizontal alignment for two-lane, two-way rural roads. The report will be of particular interest to traffic engineering personnel with responsibility for roadway signing. Highway curves tend to be high-rate crash locations. The average crash rate for highway curves is about 3 times the average rate for highway tangents, and the average run-off-the-road crash rate for highway curves is about 4 times that of highway tangents. In lieu of curve-flattening practices or other geometrically based enhancements that are rarely employed on local road systems, traffic control devices offer the most potential for reducing crash rates on horizontal curves. Warning signs (such as turn, curve, winding road, large arrow, and chevrons) with or without advisory speed plaques and a variety of delineation devices (such as wide edge lines, post delineators, raised pavement markers, and rumble strips) are used to communicate changes in horizontal alignment.
总页数：	52
报告类型：	科技报告