为了分析信号相位设置对交叉口交通设计的影响,揭示许可相位条件下交通流的运行规律,以许可相位条件下左转车流对饱和流率的修正系数为研究对象,将许可相位条件下的车道分为3类:左转专用车道、直左共用车道和一般直行车道。采用微观交通仿真软件为研究工具,对各种交通条件下的交通运行特征进行了仿真分析,在大量仿真实验数据的基础上,采用回归分析的方法,得到了许可相位条件下左转车流对饱和流率的修正系数的计算模型。该模型无需事先输入信号配时参数,适宜于交通设计阶段进行信号配时时饱和流率的估算。最后通过若干组数据验证了该模型的有效性。
In order to analyze the influence of the signal phase on design of intersections and to enclose the traffic operation regularity under permissive phase, the correction coefficient of left-turn traffic flow to saturation flow rate in permissive phase was studied. Lanes under permissive phase were divided into exclusive left-turn lane, shared through and left-turn lane, and general through lane. The traffic characteristics under different traffic conditions were examined with microscopic traffic simulation software. With large simulated data, the calculation models of correction coefficients of saturation flow rate for all kinds of lane under permissive left-turn phase were obtained by regression analysis. It is into the calculation models in advance, so the models are suitable for signal timing in intersection design. Lastly, the validity of the models unnecessary to input signal parameters the estimation of the saturation flow for was verified with a set of experimental data.