信号交叉口通行能力计算方法

目前计算城市交通网络信号控制交叉口通行能力的方法很多，适用范围各有不同。混合交通流是中国城市交通的特点。计算混合交通条件下城市信号控制交叉口的通行能力一直是众多交通领域专家学者研究的课题。以一个典型十字型信号交叉口为例，分别用目前中国常用的三种计算通行能力方法(冲突点法、停车线法、美国法)计算该交叉口的通行能力，并将结果与实测通行能力进行比较。比较结果显示冲突点法算得的结果与实测结果最接近，而停车线法和美国法算得的结果都偏大。因此，冲突点法是一种较适用于中国交通条件及混合交通流特性的通行能力计算方法。

The Methods of Computing the Capacity of Signalized Intersection

There are many methods of computing the capacity of signalized intersection in the road networks,which are fit for different conditions.Traffic in China is characterized of mixed traffic flow.Computing the capacity of urban signalized intersections is the task of many transportation planning researchers.Taking a typical four leg intersection for example,three common methods (crashing point method,stop line method and America method) are used to compute the capacity of it respectively.The results of the above methods are compared with the capacity measured on the spot.It shows that the result of crashing point method is closest to the real capacity,however the results of the other two methods are larger than the real capacity.So we can conclude that crashing point method is more suitable for the traffic conditions and the characteristics of mixed traffic flow in China.