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为避免传统的交通子区划分方法中人为设定阀值造成的不合理性,在分析车流时空特性的基础上引入协调效益理想值。通过改进美国道路通行能力手册给出的关联程度公式,考虑路段距离、协调相位直行车流量、行驶速度三个主要影响因素,构造了协调程度系数计算公式。在干道协调的条件下,对协调效益进行理想值预测,与协调程度对应求出实际协调效益。利用聚类相似性思想,将具有相似性质(实际协调效益)的交叉口归入同一个交通子区。最后选取实地的8个连续交叉口为例,采用本文方法划分交通子区后的控制效果与使用干道协调控制效果进行对比,验证了本文方法的有效性及正确性。
In order to avoid the irrationality caused by artificially setting the threshold in the traffic subzone division method, the ideal value of coordination benefit is introduced on the basis of analyzing the spatio-temporal characteristics of traffic flow. The formulas of the degree of coordination are constructed by improving the formula of the degree of association given in the American road capacity manual, taking into account the three main factors that affect the distance of road sections, coordinating the number of phase straight traffic flows and the driving speed. Under the condition of coordination of main roads, the ideal value of the coordination benefits is predicted, and the actual coordination benefit is obtained according to the degree of coordination. Using the idea of clustering similarity, intersections of similar nature (actual coordination benefits) are grouped into the same traffic sub-area. In the end, eight consecutive intersections in the field are selected as examples. The comparison between the control effect of traffic subregion by this method and the effect of using coordinated control of arterial roads verifies the validity and correctness of the proposed method.