快速路出入口设置实证研究

Empirical Analysis of Setting Exits and Entrances of Urban Expressways

出入口是快速路与周边路网连通的关键部位,直接影响到快速路和辅路车流的运行效率.首先,总结归纳了快速路出入口设置存在的常见问题,并提出了相应的改善措施.然后,结合实例,构建了仿真模型及仿真流程,并对改善效果进行了仿真.仿真结果表明:合理设置主路公交站与出口的间距,可以有效地减少公交车进出停靠站对社会车辆的干扰,车辆排队长度、延误和停车次数都相应减少,出口至辅路路段拥堵得到缓解.改善前后,案例主路至辅路路段车辆平均排队长度减少62.1%;停车次数减少了46.9%,小汽车延误降低了70.1%.

Exit and entrance are key parts connecting express way and its surrounding road network and have directly impacts on the operating efficiency of express way and auxiliary lane.Firstly,this study proposes corresponding improvement measures on the basis of summarizing the current problem in setting exits and entrances of an express way.With real examples,this research establishes the simulation model and the simulation procedure,and analyzes the effect of the improvement measures.The simulation results show that a rational distance between the bus stop and the exit of an express way will reduce the disturbance between the buses getting into or coming out of the stop and other social vehicles,which does good to decrease the queue length,delay time and stopping times of vehicles,and releases the congestion of the road segment from exit of the express way to the auxiliary lane.According to the comparative analysis,the queue length,stopping times and delay time of the vehicles on the studied road segment have been decreased by respectively 62.1%,49.9% and 70.1%.