高速公路入口匝道连接处车辆等待延误研究

Waiting Delay of Vehicles at the Junction of Expressway and On-ramp

高速公路入口匝道延误由车辆等待延误与车辆加减速延误组成,等待延误占据总延误的80%左右,而对于车辆的等待延误研究较少。文中以排队论和可接受间隙理论等为基础,讨论了高速公路入口匝道连接处的等待延误。在入口匝道和高速公路主线不同车辆到达流量的情况下,分别进行了研究,建立起了相应的模型,获得了匝道车辆的等待延误。等待延误的研究,对于评价入口匝道的通行状况,和作为一项改进入口匝道设计的依据,以及对交通管理和控制策略的评价完善是十分有益的。最后,通过选取模型中的参数数据,用matlab编程描述了匝道车辆等待延误与临界间隙及匝道车辆平均到达率等参数的关系,表明模型较符合实际运行状况,具有一定的适用性。

Delay of on-ramp contains waiting delay and delay of accelerating and slowing down the speed. Waiting delay occupies about 80% of the total delay; however waiting delay is less studied. Based on the Queuing Theory and the Gap Acceptance Theory, the waiting delay of vehicles at the junction of on-ramp and expressway is discussed to analyze the crossing status of the entrance ramp. At different flows in on-ramp and in expressway, waiting delay is separately dis- cussed. In this paper, a corresponding model is established, and the waiting delay is obtained. The research on waiting delay is helpful to evaluate traffic conditions of on-ramp, and to improve the design of the on-ramp. Moreover, it can eval- uate and improve the strategy of traffic management and control. At last, by selecting appropriate parameter values in the model, MATLAB programming is used to analyze the model. The results indicate that the model can reflect the actual traffic flow status at the junction of expressway and on-ramp.