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分析了信号交叉口交通流的随机特性,根据与期望排队长度相关的相位机动车排队长度偏差指标,考虑不同相位的权重因素,建立了交叉口信号配时优化模型,研究了相位清空可靠度与周期时长和相位绿灯时间的定量关系。对模型进行了确定性转化,并以两相位信号交叉口为例进行了算例试验分析。计算结果表明:交通流到达率的方差从0增加到350 pcu.s-1时,周期时长将从50 s增加到232 s,且到达率方差较大的相位需要更多的绿灯时间;排队长度由4 pcu增加到30 pcu时,相位清空可靠度仅从0.712增加到0.884。可见交通流到达率的随机特性对交叉口信号配时参数的设置影响明显,模型正确。
The random characteristics of traffic flow at the signalized intersection are analyzed. Based on the deviation index of the phase motor vehicle queuing length related to the expected queue length and the weighting factors of different phases, the signal timing optimization model of the intersection is established, and the phase clearance reliability and The relationship between cycle time and phase green time. A deterministic transformation of the model was carried out. A case study of a two-phase signalized intersection was carried out. The calculation results show that when the variance of traffic flow arrival rate increases from 0 to 350 pcu.s-1, the cycle time will increase from 50 s to 232 s and the green light time will be needed for the phase with larger variance of arrival rate. The queue length From 4 pcu to 30 pcu, the phase clear reliability increased from only 0.712 to 0.884. It can be seen that the random characteristics of traffic flow arrival rate have obvious influence on the setting of signal timing parameters at the intersection, and the model is correct.