基于Nagel-Schreckenberg交通流模型的演化规则,建立了路口等距分布的主干道交通流模型,在开放性边界及路口以同步红绿灯控制的条件下对交通流进行了数值模拟.分析结果发现:主干道的通行能力由路口的通行能力决定;低密度时,流量与路口数目无关,利用平均场方法,可算出平均速度随绿灯周期变化的极值位置;高密度时,流量与路口数目有关,通过调整交通灯周期,可使主干道处于最佳交通状态. Based on the evolutionary rules of Nagel-Schreckenberg traffic flow model, the traffic flow model of main road with equidistant distribution at intersections is established, and the traffic flow is simulated under the condition of synchronous traffic light control at the open boundary and junctions. The results show that: The traffic capacity of the road is determined by the traffic capacity of the road junction. At low density, the traffic is not related to the number of intersections. The average field method can be used to calculate the extreme position of the average speed with the green light cycle. At high density, Adjust the traffic light cycle, the main road in the best traffic conditions.