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对环形交叉口的车辆运行特性进行理论分析的基础上,结合不同类型交叉口的特点,确定了车辆平均延误和冲突数作为环形交叉口服务水平的评价指标,接着通过VISSIM软件仿真得到了环形交叉口两个指标随V/C增加的变化规律,从而确定低负荷下采用车辆平均延误作为主要评价指标,高负荷下采用冲突数作为主要评价指标,最后,借鉴HCM2000的分级标准对2车道4肢环形交叉口的服务水平进行了分级,为环形交叉口的性能评价和改进方案优选提供理论依据。
Based on the theoretical analysis of the vehicle operating characteristics of the roundabout and the characteristics of the different types of intersections, the average delay and the number of conflicts of the vehicles are determined as the evaluation indexes of the service level of the roundabout. Then, the cross of the roundabout is obtained by the VISSIM software simulation. The two indicators with the V / C increases the variation of the law, so as to determine the average load under low load vehicle as the main evaluation index, the number of conflicts under high load as the main evaluation index. Finally, drawing on HCM2000 grading standards for 2 lane 4 limbs The service level of the roundabout is graded, which provides the theoretical basis for the performance evaluation and improvement of the roundabout.