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中文摘要：
在Biham等人提出的二维元胞自动机交通流模型基础上，建立了具有中心车站的二维元胞自动机城市交通流模型，该模型考虑了对外交通对城市交通流的影响，推导出了这种二维CA交通流模型的演化方程、在计算机上模拟了在不同对外交通概率情况下的交通状况，得到了车辆在不同参数下交通流模型的基本演化图．进一步还模拟了城市长途车站数量对城市交通的影响．结果表明，较小的对外交通概率就会对城市交通状况产生较大的影响，适当增加中心车站的数量对城市交通状况有一定的改善.
英文摘要：
Based on the two-dimension cellular automaton traffic flow model proposed by Biham and other peoples, this paper establishes a two-dimension cellular automaton traffic flow model with central bus stations, which takes into consideration the external traffic＇ s influence upon a city＇ s traffic flow. A group of evolution equations which describing a 2D cellular automaton traffic-flow model are presented. This model simulates the traffic condition under various external traffic probabilities, and further more the effect of the number of a city＇s long-distance bus stations upon its traffic. We present the fundamental diagrams of traffic flow under different parameters. The research shows that a lesser external traffic probability may exert a bigger influence upon a city＇ s traffic, and a proper increase of the central bus station will improve a city＇s traffic.
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