车速限制下高速公路临时路肩使用条件研究

Research on temporary applicable conditions of expressway shoulder under speed limit

针对高速公路出口处交通拥堵等问题,以车辆平均延误时间表征交通效率,以冲突率表征交通安全水平,建立了西汉高速公路出口处上游主路临时路肩使用模型。基于车速限制理论,结合临时路肩使用方法,应用MATLAB/VISSIM COM软件分别建立了交通效率和行车风险仿真模型。研究结果表明:当交通量在2400 pcu/h以下时,行车风险与交通效率在路肩开启时,没有显著差异。当交通量超过2400 pcu/h时,对于主路路肩使用进行车速限速80~90 km/h时,能在行车风险没有显著性差异的情况下,交通效率提高了27.9%。

In order to alleviate the problems of traffic congestion at the exit of expressway,the average delay time of vehicles is used to characterize traffic efficiency,and the conflict rate to represent the traffic safety level.The model for temporary use of upstream main road shoulder at the exit of Xi Han expressway is established.Based on the speed limit theory,combined with the temporary use of the road shoulder,the traffic efficiency model and driving risk model are established by using MATLAB/VISSIM COM software.Research results show that when the traffic volume is below 2400 pcu/h,there is no significant difference between the driving risk and traffic efficiency when the shoulder is opened.However,when the traffic volume exceeds 2400 pcu/h,and the speed limit is set as 80-90 km/h in the main road shoulder,the traffic efficiency is increased by 27.9%without significant differences in driving risk.