Abstract: In order to study the influence of left-turning vehicle driving behavior on the main road of unsignalized T-intersection on the traffic flow of the intersection, a cellular automaton model of unsignalized T-intersection traffic flow was established. Under open boundary conditions, the influence of different left-turning vehicle driving behaviors on vehicle average conflict frequency and delay at intersections were studied. The research shows that the driving behavior of left-turning vehicles is closely related to vehicle average conflict frequency and delay at intersections. Under the condition of conservative driving behavior, there is no vehicle conflict at the intersection, but the average delay of vehicles at the intersection will be higher, compared with the steady driving behavior and adventurous driving behavior. For steady and adventurous driving behaviors, in terms of vehicle conflicts at intersections, adventurous driving behaviors will cause more vehicle conflicts at intersections. In terms of the vehicle average delay of intersection, when the left-turning traffic flow is low, the vehicle average delay of intersection under adventure driving behavior is higher. With the increase of left-turning traffic flow, the vehicle average delay of intersection under adventure driving behavior is gradually lower than that under steady driving behavior.

Key words: traffic engineering; unsignalized T-intersection; left-turning vehicle; driving behavior; cellular automata model

摘要： 为研究无信号T型交叉口主路左转车辆驾驶行为对交叉口交通流的影响，建立了元胞自动机无信号T型交叉口交通流模型，在开放边界条件下研究了不同左转车辆驾驶行为对交叉口车辆车均冲突频次与延误的影响。研究结果表明：左转车辆驾驶行为与交叉口车辆车均冲突、车均延误有密切关系。在保守型驾驶行为条件下，交叉口无车辆冲突，但相比于稳重型和冒险型驾驶行为，交叉口车均延误将更高；对于稳重型和冒险型驾驶行为而言，在交叉口车辆冲突方面，冒险型驾驶行为会导致交叉口产生更多的车辆冲突；在交叉口车均延误方面，当左转车流量较低时，冒险型驾驶行为下的交叉口车均延误更高，随着左转车流量的增加，冒险型驾驶行为下的交叉口车均延误逐渐低于稳重型驾驶行为下的交叉口车均延误。

关键词: 交通工程；无信号T型交叉口；左转车辆；驾驶行为；元胞自动机