中文摘要：

为了探讨加速车道长度对高速公路主线交通流的影响，利用可接受间隙理论，分析上匝道合流区通行特性和通行能力；基于最小车头时距，研究了加速车道上车辆汇入高速公路主线的概率；以高速公路主线和加速车道的车流量、最小车头时距等参数为基础，优化了高速公路加速车道长度设计方法，获得了入口匝道交通流控制模型。结果表明：运用该方法设计高速公路加速车道长度，控制入口匝道交通流，在高速公路主线车流量不变的情况下，入口匝道车流量比传统方法增加了近1倍。

英文摘要：

In order to explore the influence of length of the acceleration lane on expressway traffic volume in main line and using the acceptance gap theory, running characteristics and capacities of the on-ramp merging region were analyzed. Based on the minimal acceptable headway, the probability of vehicles in the acceleration lane merged into the expressway was studied. According to the traffic volume and the minimal acceptable headway in the main line of expressway and acceleration lane, a new optimal design method of the acceleration lane length was presented, and the control model of the on-ramp traffic volume was obtained. The results show that if the method for recommending the acceleration lane length and the control model of on-ramp traffic volume are used, under the situation that the expressway traffic volume in main line doesn＇t change, compared with the traditional method, the traffic volume in on-ramp merging region is improved nearly double by the method.