城市道路平面交叉口是城市路网中重要的节点，也是事故频发和造成交通延误的瓶颈点。
The intersection of urban road network is an important urban node, is also a frequent accidents and traffic delays caused by the bottleneck point.
本文的研究为城市道路平面信号交叉口的左转交通流的组织和管理有借鉴意义。
This research is referenced to the organization and management of the left-turn traffic in the urban road signalized intersections.
城市平面交叉口是城市道路网络的基本节点，对其实施合理的控制，是解决交叉口问题的关键。
The intersection is the basal node in city, and has important influence on traffic. So whether the intersection is controlled reasonably is the key to figuring out the traffic problems.
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