中文摘要：

为了探究设置左转专用相位对称放行时,双流向互阻塞型左转短车道进口道最大通过量及车流互阻塞概率的变化规律,基于车流泊松到达特征,考虑相邻周期车辆排队影响,运用概率论及交通流理论建立左转短车道进口道最大通过量解析模型。通过实测数据及VISSIM仿真对模型结果进行非参数假设检验及误差分析,并对影响进口道最大通过量的关键因素（短车道容量、周期、绿信比、相序、交通流量）进行敏感性分析。结果表明：在5%置信水平下模型值与实测值无显著性差异,相对误差绝对值小于10%,模型拟合度较高;当进口道车流量小于500pcu·h~（-1）时,周期时长对进口道通过量无影响,否则进口道通过量随周期的增加先缓慢增加后逐渐减小,存在最佳周期,最佳周期随左转车比例或短车道容量的增加而增加,范围为[40s,80s];当进口道车流量大于700pcu·h~（-1）时,增加短车道容量可有效提升进口道最大通过量,与独立左转车道进口道相比,短车道容量越大,通过量折减越小;当周期小于60s或左转与相邻直行车流量小于350pcu·h~（-1）时,相序对进口道通过量影响较小,反之则影响较大;先放行饱和度较大的车流可提升进口道通过量;利用该方法以进口道通过量最大为目标获得的短车道容量,相比于AASHTO短车道容量经验值,在左转或直行车比例大于等于70%时能够达到更优的车流运行效益,满足实际运行需求。

英文摘要：

In order to investigate change regularities of maximum throughput and blockage probabilities of the approach of the double-flow blockage short left-turn lane with the exclusive left-turn symmetry phase, theoretical models for estimating maximum throughput were proposed by utilizing the probability theory and the traffic flow theory based on the Poisson arrival characteristics of traffic flow. Through non-parametric hypothesis test and relative error analysis in view of measured data and the VISSIM simulation, there was no significant difference between model values and measured values when confidence level was 5% and the absolute relative error was less than 10%. It was clear that the degree of fitting of the model was high. Intensive sensitive analyses on some critical factors influencing the maximum throughput, such as the storage capacity of short left-turn lane, cycle length, green split, phase sequence and traffic flow, were conducted. The results show that when the traffic flow is less than 500 pcu h-1 , cycle length has no effect on the throughput in approach. However, if the precondition is opposite, the throughput increases slowly and then decreases. The optimum cycle length ranges from 40 seconds to 80 seconds, increasing with the increase of the short left-turn lane capacity or the ratio of left-turn traffic flow. Meanwhile, the maximum throughput in approach increases with the increasing capacity of short left-turn lane when traffic flow is more than 700 pcu h-1. Compared with the exclusive short left-turn lane, the larger the capacity of short left-turn lane is, the less the reduction can be. The influence of phase sequence on the throughput of approach is weak when cycle length is less than 60 seconds or traffic flow is less than 350 pcu h-1. However, if the precondition is opposite, the influence is obvious. Giving priority to the traffic flow with high flow saturation, the throughput of approach can be improved. Compared with recommended storage capacity of short left turn lane in AASHTO, the s