城市干道信控交叉口最小间距计算

Minimum Spacing Calculation for Signalized Intersections on the Urban Arterial

为提高城市干道信控交叉口交通安全水平,提出信控交叉口的感知反应区域、减速行驶区域、排队区域等上游功能区空间要素长度公式,在此基础上,通过红灯、黄灯损失、黄灯起始、绿灯等信号时段车流运行规律分析,建立上游功能区长度模型.然后提出考虑反应视距的下游功能区长度模型,从而确定基于功能区长度的信控交叉口最小间距公式.最后应用逼近理想解排序法,以某干道相邻信控交叉口为例进行计算及评价.评价结果表明,与现状相比,满足最小间距的相邻信控交叉口区域交通安全水平较高;当间距大于最小间距数值时,该区域交通安全水平趋于稳定.通过基于信号配时的功能区长度建模,提出的最小间距计算方法可优化信控交叉口间距方案,提高交叉口布局的合理性.

To heighten the traffic safety level of urban arterial signalized intersection, signalized intersection upstream functional area space factor length formulas for the perception-reaction area,deceleration running area and queue area are proposed. On the basis of that, through analyzing traffic running regular pattern in signal intervals, which include red time, yellow loss, yellow initiation and green time,upstream functional area length models are established. Then the downstream functional area length model considering the decision sight distance is proposed, so that the signalized intersection minimum spacing formula based on the functional area length is determined. Finally, applying Technique for Order Preference by Similarity to Ideal Solution, adjacent signalized intersections of one arterial are taken as an example for calculation and evaluation. Evaluation results indicate that, compared with the present condition, the adjacent signalized intersection area which satisfies the minimum spacing has the higher traffic safety level. When the spacing is larger than the minimum value, the traffic safety level of the area tends to be stable. It can be seen that, through modeling the functional area length based on signal timing, the proposed minimum spacing calculation method could optimize signalized intersection spacing schemes and heighten the intersection location rationality.