城市主干路交通溢流控制建模及仿真

利用冲击波理论估计路口的排队消散速度,利用累积的原理估计路段的最大排队长度。下游路口周期开始到最大排队期间,根据上游到达排队车辆加路段初始排队车辆等于下游消散排队车辆的基本物理原理,建立发生交通溢流时的临界相位差模型。通过改变等长度路段的流量和等流量下路段的长度,分别计算临界相位差。结果显示,该模型能够有效避免交通溢流现象的发生。

Modeling for traffic overflow control and its simulation on urban arterial roads

The queue dissipate velocity was estimated by shockwaves theory and the maximum queue was deduced by the cumulative method. Between start time of a cycle to the maximum queue time of the downstream intersection, the threshold of offset model was derived when a spillover was happening by the basic physical principle that arrival vehicles add initial vehicles equal vehicles dissipated from the downstream. Traffic flow of a link and link queue with a same traffic flow were changed, and the offset thresholds were calculated respectively. Results showed the model could avoid traffic spillovers effectively.