信号控制交叉口左转非机动车过街模式适用性

为分析信号控制交叉口两种左转非机动车过街模式（机动车和非机动车一体化模式以及行人和非机动车一体化模式）的适用条件,在动态交通条件下,定量分析两种模式对典型两相位和四相位信号控制交叉口通行效率和安全性的单独与综合影响。在通行效率方面,选取机动车通行能力作为评价指标;在安全性方面,引入一个可比选交通设计方案的指标——交通当量冲突。通过理论与实例分析,从通行效率和安全性两方面给出了两种模式的适用性。结果表明：两种模式在上述方面均有单独优势;两相位信号控制交叉口,在相应的左转非机动车和机动车交通量条件下两种模式均能同时提高交叉口通行效率和安全性;四相位信号控制交叉口,两种模式均不能同时起到积极作用。

Non-motorized Vehicle Left-turn Design at Signalized Intersections

To discuss the implementation conditions for two for non-mo- torized vehicle left-turn designs （integration of motorized and non-mo- torized vehicles and integration of pedestrian and non-motorized vehi- cles） at signalized intersection under dynamic traffic flow, this paper quantitatively analyses the impact of two designs options on the safety and efficiency of the 2-phase-controlled and 4-phase-controlled signal- ized intersections. The motorized vehicle traffic capacity is selected as the traffic efficiency evaluation index, and equivalent traffic conflicting is used as roadway safety evaluation index. Through the theoretical and practical analysis, the implementation condition for both types of design is investigated. The analysis results show that each type of design has its advantages in traffic efficiency and safety. Both designs can enhance the efficiency and safety at the 2-phase signalized intersections, while both designs do not show any benefits at 4-phase signalized intersections.