高速公路上匝道合流区通行能力经验模型

Empirical highway capacity model of on-ramp junction

研究了合流区外测车道不同位置车头时距、交通量的变化规律,分析了高速公路上匝道合流区的通行能力,运用回归技术和统计方法,建立了主路外侧车道交通量的实测经验模型,总结出车头时距的实测经验分布为变阶数的Erlang分布。运用间隙接受理论分析了匝道车辆在高速公路合流区汇入主路的运行状态,最终建立高速公路上匝道合流区的通行能力模型,它是主路交通量、匝道交通量、匝道车辆临界间隙、随车时距及加速车道长度的函数。结果表明计算值与理论值基本吻合,该模型是可行的。

The laws of flow rate and headway varied with location in outside lane were studied. The highway capacity model of on-ramp freeway junction was analyzed. The empirical flow rate model was set up using regression techniques and statistical methods. It is pointed out that the headway distribution of traffic in outside lane is variable Erlang distribution. The merging behavior of ramp vehicle was analyzed with gap acceptance theory. The empirical highway capacity model of freeway on-ramp junction was set up by analysis the gap acceptance process. The results indicate that calculation value and measurement value almost equal, this model is feasible.