Decision-Making Guide for Traffic Signal Phasing
| 项目名称： | Decision-Making Guide for Traffic Signal Phasing |
| 摘要： | The FHWA has identified intersections as one of four primary focus areas for improving safety and reducing crashes. In the United States, it is estimated that signalized intersections comprise less than 10 percent of the total number of intersections; but more than 30 percent of intersection fatalities occur at signalized intersections. One of the most important factors impacting both the safety and operations at a signalized intersection is signal phasing (the order and manner in which movements are served by a traffic signal). Little research has been done in recent years related to the safety and operational aspects of signal phasing. Although there is some guidance in national manuals (such as the FHWA Signal Timing Manual), much of the information is based on rules-of-thumb with limited empirical underpinning. Selection of an appropriate signal phasing, given the prevailing conditions, can have the benefits of improving safety, decreasing delay, reducing congestion, and reducing emissions. The objective of this research is to develop an engineering decision-making guide that incorporates both safety and operational impacts in evaluating traffic signal phasing alternatives for conventional intersections. Examples of Signal Phasing Alternatives that may be addressed: (1) Left Turns (Protected Only v. Protected/Permitted v. Permitted Only, Leading v. Lagging, Split Phasing, Changes in phasing based on time of day or traffic conditions, Treatment of multiple left-turn lanes); (2) Right Turns (Overlaps with complementary left turns, Treatment of dual right turn lanes); (3) Pedestrians (Concurrent v. Exclusive, Leading Pedestrian Indication); and (4) Interactions (Elimination of permitted left turns and right turns on a conflicting pedestrian actuation, Conflicts between U-Turns and Right Turns). |
| 状态： | Active |
| 资金： | 600000 |
| 资助组织： | National Cooperative Highway Research Program |
| 项目负责人： | Derr, B Ray |
| 执行机构： | VHB Engineering, NC, P.E. |
| 主要研究人员： | Daily, Christopher |
| 开始时间： | 20150813 |
| 预计完成日期： | 20190831 |
| 实际结束时间： | 0 |
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