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Communicating Changes in Horizontal Alignment.
| 题名： | Communicating Changes in Horizontal Alignment. |
| 作者： | LYLES, R. W.; TAYLOR, W. C. |
| 关键词： | HIGHWAY DESIGN; ROAD CURVES; RURAL HIGHWAYS; TRAFFIC CONTROL DEVICES |
| 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. |
| 报告类型： | 科技报告 |
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