高速公路左侧路肩设置必要性研究

Necessity Analysis of Inside Shoulder of Multi-Lane Expressway

尽管《公路工程技术标准》(JTG B01-2003)中规定八车道的高速公路应当设置2.5 m的左侧硬路肩,但国内几条刚刚改建完成的八车道高速公路中没有一条设置了左侧硬路肩,甚至没有宽于0.75 m的路缘带。研究运用可接受间隙理论计算了不同流量和车道数条件下车辆从最内侧车道穿插变道停驶到右侧路肩这一过程的概率和所需距离,并通过交通事故数据调研,分析了左侧路肩设置对提高交通安全的影响,从运行效率和交通安全两个方面定性和定量分析了左侧路肩设置的必要性。

＂Technical Standard of Highway Engineering＂（JTG B01-2003） regulated that eight-lane expressway should be provided 2.5-meter width inside shoulder.While several just completed widening to eight-lane expressway are not set inside hard shoulder,nor even wider than 0.75-meter curbs.This study established the probability and distance model of the vehicle changing from the inner lane to the right shoulder based on gap acceptance theory according to the different volume and lanes,and based on the traffic accident data the safety benefit of the existence of inside shoulder is analyzed.Above-mentioned aspects stressed the necessity of setting the inside shoulder of multi-lane expressway.