中文摘要：

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。

英文摘要：

The stochastic characteristic of traffic flow was analyzed at isolated intersection,the deviation of queue length of phase vehicles correlating to the expected queue length was studied,the weights of all phases were considered,and an optimization model of signal timing was proposed.The quantitative relationships among phase clearance reliability（PCR）,signal cycle and green time were determined,a deterministic transformation was achieved for the model,and a simulation example of two-phase signalized intersection was analyzed by using the model.The result indicates that when the variance of arrival rate increases from 0 to 350 pcu·s-1,the cycle length increases from 50 s to 232 s,and the phase with the larger variance of arrival rate needs much green time.When the queue length increases from 4 pcu to 30 pcu,the phase clearance reliability only increases from 0.712 to 0.884.The random variation of arrival rate has an obvious effect on traffic signal setting,and the model is correct.2 tabs,13 refs.