Abstract: In view of the insufficient researches on shared throughright turn lanes capacity at signalized intersections in China, the paper investigates the traffic operation of shared throughright turn lanes and analyzes the traffic characteristics. Based on the measured data, the saturation headway of vehicle for different shift is analyzed using the Ttest statistical method. that the results show that a significant difference between the saturation headway of through and rightturn vehicles are existed. Then, a theoretic model for throughright turn lanes capacity is developed by saturation flow rate correction theory and probability methods. This study provide a theoretical basis for planning, design, transformation, traffic organization, signal timing, operations evaluation and lane setting at signalized intersections.

Key words: urban traffic, signalized intersections, shared throughright turn lanes, adjustment factor for right turns, capacity

摘要： 为了弥补国内对直右共用车道通行能力研究的不足，在现场观察的基础上，分析了其交通流运行特性.根据实测数据，运用统计学中的T检验法对不同转向车辆的饱和车头时距进行了分析，发现直右共用车道上直行车辆和右转车辆的饱和车头时距存在显著性差异；然后运用饱和流率修正理论和概率论方法，给出了适用于我国现阶段道路交通条件下直右共用车道通行能力计算模型.研究成果将为信号交叉口的规划、设计、改造、交通组织、信号配时、交通运行评价以及车道设置提供理论基础.

关键词: 城市交通, 信号交叉口, 直右共用车道, 右转修正系数, 通行能力