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通过对我国城市间大量存在的二级、三级等双车道公路上运行车辆车头时距的研究，提出了一种改进的Ｍ３ 车头时距分布模型；并讨论了对于采用让路规则管理交通的无信号交叉口，当主车道车流车头时距服从各种不同的分布下时，次车道车流的理论通行能力．
This paper presents an improved M3 headway distribution model based on the research on the running time of two-lane and two-lane highways on the second and third level cities in our country. And it is discussed that for the traffic management rules At signalized intersections, the theoretical traffic capacity of next-lanes traffic flows when the head lanes of the main traffic lanes are subject to various distributions.