信号灯随机更新的城市交通网络模型

Signal Controlled Urban Traffic Network Model with Random Update Rule

【目的】改进二维元胞自动机模型(BML模型),使其更好模拟实际城市交通网络。【方法】利用元胞自动机方法,建立信号灯随机更新的城市交通网络模型。【结果】数值模拟发现,信号灯的同步对城市交通网络的影响较大,且随机更新的引入使得网络系统的临界密度大幅度降低。【结论】同时调整信号灯的分布和信号变换周期能有效控制交通网络,解决由于信号灯随机更新所造成的系统临界密度变小的问题。

Objective]An improved two-dimensional cellular automaton model （BML model） was proposed to better simulate real urban traffic network.[Methods]Aiming at the urban traf-fic congestion problem and using the cellular automata method,a traffic signal model with ran-dom update rule was established to study the urban traffic network.[Results]Simulation results showed that the synchronization of the traffic signal has great influence on the traffic system, and the introduction of random update rule significantly reduces the critical density of phase transition.[Conclusion]When the roads are crowed by cars,simultaneous adj usting of signal ar-rangements and periods provides a possible way for relaxing the traffic congestion.