Abstract: Based on the analysis of traffic phenomena,this paper sets up the distribtuion model of headway Gamma distribution function and makes parameter estimation by using Moments methods.Then it discusses the model in several special cases.Finally the validity of the model is certified by imitation of the information of headway in the road.It supplies feasible foundation to highway capacity.

Key words: headway, gamma function, statistical distribution, highway capacity

摘要： 在合理分析交通流现象基础上,针对车间时距分布特性,应用γ分布函数建立适用广泛的车间时距分布模型,并利用矩法对其参数进行无偏估计,然后,讨论模型的几种特殊情况 .最后结合高速公路实际的车间时距观测资料验证该模型的有效性,可为交叉口设计、控制及道路通行能力分析提高更为可靠的依据.

关键词: 车间时距, γ函数, 统计分布, 通行能力