中文摘要：

以GoogleEarth软件作为观测工具,在大量观测的基础上,从匝道构造型式可能对交通流运行特征的影响角度,总结了影响匝道类型划分的主要因素,并最终将我国的高速公路出口匝道分为4类.在此基础上,以主线上游段、匝道中游段、主线下游段的车辆运行速度作为评价指标,采用TISI仿真的方法,以A型出口匝道为例,分析了输入交通量、大型车比例、出口转向率等因素对通行效率的影响,并确定了相关参数的影响范围.最后,在出口转向率为20%,大型车比例为40%的条件下,定量分析了各类型出口匝道通行效率随输入交通量的变化规律,比较了4种类型出口匝道通行效率的优劣,并对其适用条件和实际应用中应重点考虑的问题进行了说明.

英文摘要：

Taking the GoogleEarth as an observation tool,this paper summarized the main influential factors of off-ramp classification from the perspective of structural pattern and its influence to traffic flow characteristic,and finally put it into four categories.In this way,operational speed of different part of off-ramp were chosen as evaluation indexes to describe the operational efficiency of off-ramp,the influential parameters such as traffic volume,the percentage of large vehicle,and the percentage of exit steering vehicle were also ensured with simulation.Finally,this paper analyzed the change tendency of four kinds of off-ramp,with increase of input traffic volume,on condition that the percent of large vehicle equals 40% and the exit steering vehicle equals 20%,the operational efficiency difference of four kind of off-ramp were compared,and the suitable condition of each off-ramp was also pointed out.