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采用细胞自动机方法(Cellular Automata:CA)模拟含4个路口的城市道路交通流状态,并通过离散方程描述车辆的运动过程。研究了信号灯控制策略(同步定时控制及感应控制)对交通流状态的影响。数值模拟结果表明,信号灯对交通流的影响与道路中车辆密度有关,同时,感应控制参数的选取存在一合理的取值范围,可优化交通流通行效率。因此,为保证交通流的通行效率,应针对不同的车辆密度,选取适当的信号灯控制方式。
Cellular Automata (CA) was used to simulate the urban road traffic flow with four intersections and the discrete equations were used to describe the vehicle movement. The influence of traffic light control strategy (synchronous timing control and inductive control) on traffic flow status is studied. The numerical simulation results show that the influence of traffic lights on traffic flow is related to the vehicle density in the road. At the same time, there is a reasonable value range for the selection of sensing control parameters, which can optimize the traffic flow efficiency. Therefore, in order to ensure the traffic flow efficiency, we should select the appropriate signal light control method according to different vehicle density.