不同交通流状态下的车头间距分布  

Headway Spacing for Different Traffic Flows

作　　者：金晓琼[1] 王利杰[1] 邵岩[1] 

机构地区：[1]大连交通大学交通运输工程学院,辽宁大连116028

出　　处：《大连交通大学学报》2014年第1期33-36,共4页Journal of Dalian Jiaotong University

摘　　要：采用实地调查方法，将车头时距经速度转化成车头间距，并利用实测流量进行饱和度的计算，进而对车头间距进行深入的研究，得出不同交通流状态下车头间距的分布特性．自由流阶段车头间距分布是属于负指数分布，稳定流开始车头间距属于移位负指数分布，至稳定流后期车头间距分布只有部分属于移位负指数分布，r值随着交通流量的增加会缩小；在稳定流后期（0．53～0．63）和不稳定流（0．64-1）一般采用爱尔朗分布拟合．Based on the field survey and data analysis, the space headway is obtained through the headway speed-transforming. The degree of saturation is also calculated by the volume. The further research is performed for the distributioay spacing. The distribution characteristics of headway spacing for different states are obtained. In the free flow phase space headway spacing distribution is a negative exponential distribution. At the beginning of steady flow headway spacing distribution is shifted negative exponential distribution. At the later stage of steady flow, the distribution partly is shifted negative exponential distribution, and r- value along with the increase of traffic flow will be reduced. In the steady flow period （0.53 - 0. 63 ） and unsteady flow （0.64 - 1 ）, the E1 Lang distribution is generally used to fit headway spacing.

关 键 词：交通流状态 车头间距 分布特性 

分 类 号：U491.112[交通运输工程—交通运输规划与管理]