信号控制交叉口交通行为的简单二维元胞传输模型

一维元胞传输模型无法描述多相位信号控制交叉口上不同方向车辆排队的形成与消散过程,本文建立适用于多相位信号控制交叉口的简单二维元胞传输模型.提出交叉口和连线的简单二维元胞表示方案从微观层面描述交叉口进口道上不同方向的车辆排队,基于Daganzo的元胞传输模型建立简单二维元胞传输模型描述交通流在路段和交叉口上的运行与演化规律.在此基础上,在元胞层面建立信号控制方案评价指标的实时估计模型.算例分析表明,二维元胞表示方案优于一维元胞表示方案,简单二维元胞传输模型的估计精度高于一维元胞传输模型,并且简单二维传输模型能够适用于过饱和交通流.本文建立的简单二维元胞传输模型可用于路网信号控制方案的微观评价.

A simple two-dimensional cell transmission model: A dynamic representation of traffic at multiphase signals

The one-dimensional cell transmission model cannot depict different queue formations and dissipations at a multiphase signal controlled intersection. To separately depict vehicle queues at a multiphase-signalized intersection at microscopic level, a set of simple two-dimensional cell transmission logics on a link and at a signalized intersection is put forward. To properly represent the traffic dynamics at a multiphase signal controlled intersection, a simple two-dimensional cell transmission model is derived from the proposed logics based on Daganzo's cell transmission model. Finally, a series of models are put forward at cell level to dynamically estimate performance indexes of a traffic signal. Case studies show that the simple two-dimensional cell representation is better than the one-dimensional cell representation in that the estimation accuracy of the simple two-dimensional cell transmission model is higher than that of the one-dimensional cell transmission model, and that the simple two-dimensional cell transmission model can accurately represent traffic dynamics under saturated conditions. The proposed model can be used to evaluate the coordinated traffic signals.