车头时距服从M3分布下的支路通行能力仿真方法

为得出是以交通量还是以时长为控制条件所生成的支路通行能力仿真值更接近理论值,在假定车头时距服从M3分布规律下,以间隙可接受理论为基础,建立了上述2种控制条件的环形交叉口支路通行能力仿真模型;在VC＋＋6.0平台上进行仿真试验,计算出支路通行能力、时长和交通量的仿真值,并与理论值进行对比。分析结果表明：以交通量为判断条件的仿真方法所产生的仿真时长与理论时长的平均相对误差小于以时长为判断条件时的平均相对误差,前者仿真产生的支路通行能力也较后者更贴近理论值;以交通量为判断条件的仿真方法的仿真效果明显优于以时长为判断条件的方法。

Minor Lane Capacity Simulation Method of Traffic Flow Under Major Stream with M3 Distributed Headway

In order to find whether the emulation value of minor lane capacity obtained by traffic and time control methods is closer to the theoretical value,the authors,on the assumption that the headway obeys M3 distribution and on the basis that gap acceptance theory is the basic theory,constructed two simulation models for the minor lane capacity on the ring intersection with the above two conditions.The simulation process was performed on VC++ 6.0 platform.The simulation results of minor lane capacity,accumulated time,and traffic flows of major lane were calculated,and then they were used for the comparison with theoretical data.The comparison results indicate that the relative error between theoretical time and the simulation time incurred by traffic control simulation method is less than that of time control simulation method.The simulation minor lane capacity gained by traffic control simulation method is much closer to the theoretical value than that of time control simulation method.This means that the effect of traffic control simulation method is better than time control simulation method.