信号灯作用下的城市隧道路段交通流模型研究

分析了城市隧道路段的交通流特征，建立了城市隧道路段的元胞自动机模型，并针对隧道与上下游交叉口不同相对位置、不同相位差的情况，进行了数值模拟。仿真结果表明，城市隧道路段的通行能力受到隧道与信号灯的相对位置以及上下游信号灯的相位差等共同影响。合理的信号配时控制可以提升路段和交叉口通行能力，减轻拥堵；但是当隧道离下游交叉口较近时，路段通行能力明显降低，隧道内拥堵严重，信号控制手段收效甚微。

Study on the traffic flow model of urban tunnel section under signal control

In this paper, the characteristics of traffic flow in the urban tunnel section were analyzed, and the cellular automata model of the section was established. At the same time, the numerical simulation was carried out on the condition that the tunnel and the upstream and downstream intersections were in different relative positions and different phase differences. The result shows that the capacity of the urban tunnel section can be influenced by the relative position of the tunnel and signal lights as well as the phase difference between the upstream and downstream traffic lights. Reasonable signal timing control can enhance the capacity of the road section and intersections, and relieve the congestion. However, when the tunnel is close to the downstream intersection, the capacity of road section is obviously reduced, the congestion in the tunnel is serious, and signal control doesn′t work on the traffic congestion.