基于城市高架桥入口处抢道行为的交通流模型

Dynamic model based on the driver's cutting behavior near urban viaduct entrance

在对高架桥入口处驾驶人抢道行为特征分析基础上,提出R车道主动抢道和M车道被动抢道规则的三车道(L,M,R)元胞自动机交通流模型,并进行数值模拟,给出相应流量图、时空图和抢道频率曲线图,分析各车道不同进车概率pin、R车道上桥和直行车辆混合比例pm对道路交通流的影响.研究结果表明:高架桥入口处抢道行为对上游路段交通流影响显著,会导致在较小的进车概率pin和车辆混合比例pm时,发生显著拥堵,且向上游迅速传递,相应的饱和流量也随之降低,R、M和L车道饱和流量分别下降了25.0%、67.5%和47.6%,并得出抢道行为对M车道流量影响最为明显,其次为L车道和R车道.

Based on the driver＇s cutting behavioral characteristics near the viaduct entrance, a cellular automa- ton model of three-lane traffic flow is put forward based on active（R lane）and passive（M lane） cutting rules, which is proposed to simulate and analyze the dynamics of cutting on the trestle entrance. By a numerical simulation, a flow diagram, a space-time diagram and a cutting diagram are given to analyze the regularity of traffic flow under different probability of vehicle generation（pin） and proportion of car mixture（pm）. The results indicate that the cutting behavior near the viaduct entrance has significant effects on the traffic flow, and causes notable jam; saturated critical flow also decreases obviously under small Pin and pm R, M and L lane flow decreases by 25%, 67.5%, 47.6% respectively. Drivers cutting behavior affects M lane most, and affect L and R lane relatively less.