混合交通信号交叉口的通行能力可靠度

Reliability of Signalized Intersection Capacity Under Mixed Traffic

分析了混合交通条件下信号交叉口通行能力的随机性,定义了交叉口通行能力可靠度,并利用基于VISSIM仿真模型获得的数据,标定分布函数,举例给出了典型分位通行能力。考虑到分析时段内车辆到达的随机性,给出了车辆随机到达条件下通行能力可靠度的估计方法。在此基础上,分析了混合交通条件下交叉口通行能力可靠度对行人、非机动车流量均值的灵敏度。结果表明:行人、非机动车交通对机动车的冲突干扰较大幅度地增加了专用转向车道通行能力的随机性,但对共用车道通行能力随机性的影响相对较小;正态分布适用于描述10 min或更长时段的信号交叉口通行能力的概率分布;交叉口机动车到达流量水平越高,行人、非机动车流量均值对通行能力可靠度的影响就愈加显著。

The stochastic properties of signalized intersection capacities under mixed traffic conditions were analyzed, and capacity reliability of signalized intersection was defined. VISSIM simulations were employed to provide capacity data for probability distribution calibrations. Typical percentile capacities of the lanes were calculated. An evaluation method for reliability of capacity was proposed when arriving volume was considered as a random variable. The sensitivity of reliability of capacity to the mean value of the conflicting pedestrian and bicycle volumes was analyzed. The results show that the impedance effects of pedestrians and bicycles result in great randomness of the exclusive turning lane capacities, but result in relatively little changes of random fluctuations of the shared lane capacities. Normal distribution is applicable to model the probability distribution of the capacities during 10 minutes or longer intervals. With a higher arriving vehicle volume, the reliability of capacity is more sensitive to the mean values of the pedestrian and bicycle volumes.