基于改进元胞传输模型的交叉口信号配时优化

Optimization of Signal Timing at Interseation Based on Improved Cell Trans-mission Model

为缓解当今社会交通拥堵的现状,提高道路通行能力,考虑不同长度的多种类型车辆的影响,改进了元胞传输模型。通过分析饱和状况下分流渠化区的溢流现象,建立了适用于多个相位控制的交叉口信号配时优化模型。以单交叉口为例,将交叉口车辆平均延误作为优化目标,采用蜜蜂算法对该模型进行动态配时优化。仿真结果表明提出的模型同时适用于交叉口无阻塞和阻塞的情况,且提出的动态配时优化方案在路段发生阻塞的情况下能及时响应交通流的变化,有效降低了交叉口车辆平均延误。

In order to alleviate the current traffic congestion and improve the road capacity,considering the influence of different types of vehicles with different lengths,the cell transmission model is improved. An optimization model for signal timing of intersections suitable for multiple phase control is established by analyzing the overflow phenomenon of the channelization area under saturation condition. Taking the single intersection as an example,the bees algorithm is applied to optimize the timing schedule dynamically where the average vehicle delay is considered as the objective of optimization. The simulation results show that the proposed model is suitable for unobstructed and obstructed conditions at the intersection. The dynamic timing optimization scheme proposed can respond to changes in traffic flow and the average vehicle delay can be reduced effectively.