A Timing Optimization Method for Signalized Intersections Considering the Courtesy Rules to Pedestrians
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摘要: 为提高机动车礼让行人背景下的人车通行效率,研究了基于叠加相位设计的信号交叉口配时优化方法。以西安市1个典型交叉口为例,分析机动车与过街行人冲突情况;在Webster配时模型的基础上,提出叠加相位设计与人车冲突时空分离策略相结合的信号配时优化方法,并给出行人信号早启时间、人车绿时分离设置阈值的计算方法;运用VISSIM仿真软件,对不同信号配时优化方案的效果进行验证。研究结果表明:与现状相比,所提出的配时优化方法可分别降低各类延误27.11%(车均)、22.41%(人均)、27.08%(车辆总计)、22.49%(行人总计)和26.15%(交叉口总计),减少各类污染物排放3.76%(VOC)、3.76%(CO)、3.76%(NOx),并降低燃料消耗3.78%。该方法能有效改善信号交叉口的通行效率,缓解人车冲突。Abstract: In order to improve the efficiency of signalized intersections under the consideration of the courtesy rules from vehicles to pedestrians, a timing optimization method based on superposition-phase is proposed. A typical intersection from Xi'an is taken as a case study. The conflicts between vehicles and pedestrians are analyzed. Based on Webster's timing model, a timing optimization model is developed, which combines superposition phase design and space-time separation strategy for reducing the conflicts between vehicles and pedestrians. In addition, the calculation methods for starting time of pedestrian phase and the threshold for adopting vehicle-pedestrian phase separation strategy are proposed. Then VISSIM simulation software is used to verify the effectiveness of the proposed signal timing optimization schemes. The simulation results show that compared to the current scheme, the scheme from the proposed timing optimization method can reduce the average vehicle delay, delay per capita, total vehicle delay, total pedestrian delay and total intersection delay by 27.11%, 22.41%, 27.08%, 22.49%, and 26.15%, respectively. In addition, it can also reduce the emissions of VOC, CO, NOx, and fuel consumption by 3.76%, 3.76%, 3.76%, and 3.78%, respectively. The proposed method can effectively reduce the vehicle-pedestrian conflicts and improve the efficiency of traffic operation at signalized intersections.
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表 1 不同时段等待过街行人数量
Table 1. Pedestrians waiting for crossing the street in different time intervals
时段 平峰 高峰 1个周期内等待过街人数/人 14 23 表 2 礼让行人情况
Table 2. Vehicles yielding to pedestrians
单位: 辆 进口 平峰时段 高峰时段 过度礼让 合理礼让 不礼让 过度礼让 合理礼让 不礼让 东进口 8 56 7 6 58 5 西进口 8 55 5 16 80 6 南进口 9 77 4 10 56 4 北进口 6 48 7 7 84 13 总计 31 236 23 39 278 28 表 3 不同信号配时方案内容
Table 3. Specifications of different signal timing schemes
方案 说明 内容 1 现有信号配时方案 东西直(32 s)、东西左(25 s)、南直左(25 s)、南北直(32 s)、北直左(29 s), 总周期155 s 2 现有信号配时方案+行人信号早启 行人相位绿灯较机动车早开3s 3 现有信号配时方案+人车绿时分离 东西直+东西右(34 s)、东西左+东西右(25 s)、南直左+北右(25 s)、南北直+东西右(22 s)、北直左+南右(23 s),总周期155 s 4 基于Webster配时模型的信号优化方案 东西直(46 s)、东西左(20 s)、南北直(55 s)、南北左(22 s)总周期155 s 5 基于Webster配时模型的信号优化方案+行人信号早启 行人相位绿灯较机动车早开3s 6 基于Webster配时模型的信号优化方案+人车绿时分离 东西直前23 s行人通行,后23 s右转机动车通行,东西左(20 s),南北直(55 s),设置右转专用相位与左转专用相位相同为22 s,总周期155 s 7 基于叠加相位设计的信号优化方案 东直左(15 s)、东西直(19 s)、西直左(15 s)、北直左(21 s)、南北直(25 s)、南直左(10 s)总周期124 s 8 基于叠加相位设计的信号优化方案+行人信号早启 行人相位绿灯较机动车早开3s 9 基于叠加相位设计的信号优化方案+人车绿时分离 东西向右转机动车在直左相位内放行15 s,东西直(19 s),南北向右转机动车在北直左和南直左相位内分别放行21s和10 s,南北直(25 s),总周期124s -
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