拥有四条通路的转盘路口排队模型模拟。相邻路口的弧形段假设为一容量有限的队列。到达为泊松分布，不考虑车长的堵塞影响-Four channels have lined up at the junction of the turntable model. Paragraph of the arc adjacent to the junction is assumed to be a queue with limited capacity. The reach follow　the Poisson distribution.The model does not consider the impact of the longs of the cars　impact to the plug.