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TECHNIQUES TO ASSESS DELAY AND QUEUE LENGTH CONSEQUENCES OF BUS PREEMPTION.
| 题名： | TECHNIQUES TO ASSESS DELAY AND QUEUE LENGTH CONSEQUENCES OF BUS PREEMPTION. |
| 作者： | Cisco-BA; Khasnabis-S |
| 关键词： | BUS-PRIORITY; SIGNALIZED-INTERSECTIONS; DELAY-TIME; QUEUE-LENGTH; TRAFFIC-SIMULATION; MACROSCOPIC-SIMULATION; MICROSCOPIC-SIMULATION; ANN-ARBOR-MICHIGAN; TRAFFIC-VOLUME; VIDEOTAPE-; FIELD-DATA; ALGORITHMS-; TRAFFIC-SIGNAL-TIMING; TRAFFIC-FLOW-SIMULATION; CASE-STUDIES |
| 摘要： | Two deterministic methods for assessing delay and queue length consequences of bus preemption at signalized intersections are presented. The procedures are adapted from queueing theory and address three types of preemption strategies: green extension, red truncation, and red interruption. Method 1 macroscopically simulates groups of vehicles at the intersection using regular signal timing and timing under preempted conditions. Method 2 uses microscopic simulation in which each vehicle is treated individually and traffic flow patterns are evaluated for the regular signal timing and timing under preemption condition. Both methods are applied to three intersections in Ann Arbor, Michigan, representing different volume levels at the cross street. Data on vehicle arrival, service, queue lengths, and delays were compiled from videotapes made at the intersections during the spring of 1994. The algorithms developed were used to assess changes in queue lengths and delays resulting from the revised signal timing. The two methods appear to be viable tools for evaluating traffic flow consequences of preemption. The case studies indicate some variations in the results between the intersections representing different volume levels. Method 2 (microscopic) is preferred for lighter volume levels, and Method 1 (macroscopic) should be used for higher volume levels. Further research is recommended to validate the proposed methods. |
| 总页数： | Transportation Research Record. 1995. (1494) pp167-175 (2 Fig., 12 Tab., 8 Ref.) |
| 报告类型： | 科技报告 |
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