Abstract:

By analyzing traffic flow running characteristics on urban road all-way stop-controlled intersections, the methods of simplifying conflicting traffic flows for through combined and left-turn combined vehicles are introduced with consideration of equivalent people groups’ effect. Taking vehicles’ and equivalent people groups’ arriving mode into account, platoon analysis method is applied, capacity calculation models for through combined and left-turn combined traffic flows are established. Applying minimum follow-up time theory, capacity calculation models of right-turn traffic flows are obtained, and the adjustment factors are obtained as well with consideration of the equivalent people groups’ effect. The capacity calculation models of all-way stop-controlled intersections are obtained. The case study indicates that the capacity calculation models are in accordance with the traffic flow running characteristics in China, and the calculation process is simpler than iterative method as well.

Key words: traffic engineering, urban road all-way stop-controlled intersections, capacity, platoon analysis method, follow-up time, combined traffic flow

摘要：

分析城市无控制交叉口的交通流运行特征，给出了考虑当量人群流影响时直行组合车流和左转组合车流的冲突交通流简化模式.考虑机动车流和当量人群流的到达模式，利用车队分析法得到了直行组合车流和左转组合车流的通行能力计算公式.采用最小跟车时距理论，得到右转车流不受当量人群流影响时的通行能力计算公式和受当量人群流影响时通行能力修正系数的计算公式.在上述分析的基础上得到了城市无控制交叉口的通行能力计算模型.实例分析表明，本文所提出的计算方法符合我国城市道路交通流的运行特点，计算过程较迭代方法简单.

关键词: 交通工程, 城市无控制交叉口, 通行能力, 车对分析法, 跟车时距, 组合车流