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为建立快速路入口交织区的经验通行能力模型,首先利用Erlang分布来定义车辆车头时距分布,然后采用间隙接受理论模型推导入口交织区基本通行能力模型.由于并非所有主路车流车头时距都能被匝道车辆充分利用,因此建立了修正的通行能力模型,模型考虑了车头时距被利用的概率.然后,建立了通行能力折减系数(ξ)模型.结合修正的通行能力模型和折减系数模型建立了包括主线流量、临界间隙和鼻端到汇合点距离等参数的入口匝道经验通行能力模型.结果表明,与其他模型相比,所建立的经验模型考虑了交织区几何条件且简单易用,交织区通行能力和主路流量、临界间隙、鼻端到汇合点距离及主线和匝道的设计速度紧密相关.
In order to establish the model of empiricism capacity of expressway entrance weaving zone, the distribution of vehicle headway is first defined by Erlang distribution, and then the theoretical model of gap acceptance is used to derive the basic capacity model of entrance weaving zone. Which can be fully utilized by the ramp vehicles, a modified traffic capacity model is established, and the model takes into account the probability of using the headway.Then, a model of traffic capacity reduction coefficient (ξ) is established.Combined with the modified traffic capacity model and the reduction The coefficient model establishes the empirical traffic capacity model of the inbound ramp including the main flow, the critical clearance and the distance from the nose to the convergence point.The results show that compared with other models, the established empirical model considers the geometry of the interleaving zone and is simple and easy The interlacing zone capacity is closely related to the main flow, critical clearance, nose-to-confluence distance, and the design speed of the main line and ramp.