环岛网络通过能力及相关影响因素分析

The network capacity of roundabouts and the analysis of relevant influencing factors

已有对环岛通行能力的研究均未考虑车辆可以滞留在环岛中的影响因素。将环岛作为一类路网结构,提出了环岛网络通过能力。为研究可滞留在环岛中的车流量对环岛网络通过能力的影响,利用VISSIM仿真软件,模拟环岛网络通过能力,对优先权、左转比例、环岛车道数及大车比例4种影响因素进行了分析。

Vehicles＇ stranding in the roundabouts has not been considered in the existing studies when the capacity of roundabouts was defined. Viewing the roundabout as a traffic network, the concept of the network capacity of roundabouts is proposed to eliminate the influence of the stranding vehicles when defining the capacity of roundabouts.Moreover, the method is illustrated to determine the network capacity of roundabouts by using VISSIM and the effects of relevant influencing factors is analyzed, including traffic priority,left turn ratio,number of lanes and heavy vehicle ratio.