开放性边界条件下优先随机慢化对交通流的影响

NaSch模型是一种描述单车道高速公路交通的概率性元胞自动机,但它不能再现实际交通中出现的同步流现象.研究表明:改变NaSch模型的基本演化次序后,开放性边界系统在高产生概率和高消失概率这两种情形下出现低速的同步相,减小了追尾事故发生的可能性,提高了道路的通行能力.计算机模拟的结果显示了同步流、启止坡、非平衡相变等实际交通所具有的特性.

The Effect of Noise-First on Traffic Flow Under Open Boundary Condition

NaSch model is a probabilistic cellular automaton which describes the traffic of single-lane highway,but it can not reproduce the synchronized flow phe- nomenon of the traffic in reality.It is indicated from the study that after changing the basic evolutionary sequence of NaSch model,low-speed synchronized phase appears in the open boundary condition system under both situations of high input rate and high output rate.Thus the probability of rear-end collision accident is reduced,and the traffic capacity is enhanced.The results of numerical simulation show the characteristics of the real traffic,such as synchronized flow.start-stop wave,and nonequilibrium phase transition.