Based on the characteristic of the traffic flow on urban road, an improved CA traffic model is proposed.The improved model can simulate urban road trafic flow preferable.

• 摘要 针对城市道路路段上车流的流量和密度之间的特性，对道路元胞自动机交通流模型进行了改进，使CA模型能够较好模拟城市道路交通流。