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BYPASS LANE SAFETY, OPERATIONS, AND DESIGN
STUDY
| 题名： | BYPASS LANE SAFETY, OPERATIONS, AND DESIGN STUDY |
| 作者： | Howard Preston, PE Ted Schoenecker, EIT |
| 关键词： | Bypass Lanes Safety Traffic Operations Design Guidelines Legal Issues |
| 摘要： | This Study presents statistically reliable conclusions based on a comparison of the operational and safety characteristics of rural intersections without turning lanes, with bypass lanes, and with left turn lanes. The basic work tasks associated with the research study included: a literature search of nationally published research reports, a survey of bypass lane use, a summary of the legal issues associated with passing on the right, operatH.us and safety analyses, and a review of Mn/DOT ’ s recommended design guidelines and design features. The results of the safety and operations analyses did not offer a high degree of statistical reliability. However, a comparative crash analysis and a before-versus-after analysis suggested that it is impossible to conclude that the use of a bypass 1^ provides a greater degree of safety, and, therefore, bypass lanes should not be used as a safety device. There also were some concerns expressed about safety issues at four-legged intersections. Recommendations included: - Revise Mn/DOT turn lane policies to at least reduce or eliminate the use of bypass lanes at four-legged intersections. - Consider developing a shorter and less costly exclusive left turn lane design. This suggested policy revision is not meant to infer that in all places bypass lane should be immediately converted to some other design. - Offer designers positive guidance regarding the use of left-turn lanes, through a prioritized approach based on the functional Classification of the major roadway. |
| 报告类型： | 科技报告 |
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