考虑排放特性的右转专用信号相位设置研究

为解决行人信号绿灯启亮初期行人与右转机动车的不利冲突,分析了行人与右转机动车的行驶特性.以固定周期时长的2相位信号交叉口为例研究了右转信号的设置对右转机动车排放与车均延误的影响.将微观仿真软件 Vissim 与基于VSP 变量的排放模型相结合,对右转信号设置前后的3组不同行人流量下的不同右转机动车流量进行仿真,并分别对车辆排放与车均延误进行对比分析.结果表明,3组不同行人流量下右转信号设置前后的车辆尾气排放及车均延误变化趋势均相同,当右转车流量低于(615±20)pcu/h 时,右转信号设置后的车辆排放均值降低9.46%,车均延误均值减小15.84%;当右转车流量大于(615±20)pcu/h 时,信号设置后的车均延误减小,但是车辆排放增大. 

A Study of the Phase Setting of Exclusive Right-turn Signal under the Consideration of Vehicle Emission Characteristics

To alleviate the conflict between pedestrians and right-turn vehicles at the beginning of pedes-trian green light,the moving features of pedestrians and right-turn vehicles were investigated.A fixed-timed two-phase signalized intersection was taken as a case study in the paper.The impacts of the right-turn signal phase on the emission and average delay of vehicles were studied.The microscopic simulation software Vissim and the emission model based on VSP variables were combined to simulate different right-turn traffic volumes with three different pedestrian volumes be-fore and after implementing the exclusive right-turn signal phase.The exhaust emissions and average delays were analyzed respectively.The results indicate that the trend of vehicle emissions and average delays of before and after implementation are similar.The mean value of emissions is reduced by 9.46% and the mean value of average delays is reduced by 1 5.84%after implementation of the exclusive right-turn signal phase when the right-turn traffic volumes are below (61 5 ± 20) pcu/h.The average delays of right-turn vehicles decreased,but the exhaust emissions increased after right-turn signal im-plemented when right-turn traffic volumes are more than (61 5±20)pcu/h.