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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。
In order to explore the variation law of the maximum throughput and the probability of mutual traffic jam in the left turn short lane when the left turn dedicated phase is symmetrical, based on the arrival characteristics of the traffic poisson, considering the influence of the adjacent periodic vehicle queuing, Probability theory and traffic flow theory. Through the measured data and VISSIM simulation, the model results were tested by non-parametric hypothesis and error analysis. Sensitivity analysis of the key factors (short lane capacity, period, green ratio, phase sequence, traffic flow) . The results showed that there was no significant difference between the model value and the measured value at 5% confidence level, the absolute value of relative error was less than 10%, and the model fitting degree was high. When the traffic volume of imported roadway was less than 500pcu · h ~ (-1) The period length has no effect on the passage volume of the imported road, otherwise the passage volume of the imported road increases slowly and then decreases gradually with the increase of the period, there is the best period, the optimal period increases with the increase of left-turn car ratio or short lane capacity, Is [40s, 80s]. When the traffic volume of imported roadway is more than 700pcu · h ~ (-1), increasing the capacity of the short lane can effectively increase the maximum throughput of the entrance road. Compared with the entrance lane of the independent left turn lane, the short lane capacity When the period is less than 60s or when the left turn and the adjacent direct traffic flow are less than 350pcu · h ~ (-1), the influence of the phase sequence on the throughput of the inlet passage is small, otherwise the influence is larger. First release of a more saturated flow of traffic can increase the amount of import passage; By using this method, the maximum capacity of imported lanes to obtain the short lane capacity, compared to AASHTO short lane capacity empirical value, left turn or straight car ratio is greater than Equal to 70% to achieve better traffic efficiency, to meet the actual operation needs .