对四路环形交叉1:2单1:7放行方法进行了深入研究。以充分利用环形交叉口时空资源为目的,从相邻进口和环道梯形存车区域2方面,提出了2种优化的四路环形交叉口单口放行信号控制模型。并分别对2种优化信号控制模型的信号相位进行了协调设计,给出了相位协调时差计算的详细步骤,对原有周期模型进行了改进。在比较分析2种优化信号控制模型延误的基础上,对2种优化信号控制模型的适用条件作了初步探讨。最后以襄阳市襄城区檀溪路/长虹路四路环形交叉口为实例,验证了提出的优化信号控制模型的有效性。
A single release method for 4-leg roundabout is proposed. For making full use of time and space resources of roundabout, from the aspects of adjacent entrance and T-type storage spaces of circulating lane, 2 kinds of optimized single release signal control models for 4-leg roundabout are presented. The coordination of signal phase design on the 2 kinds of optimized control models is made, the phase coordination calculation is described in details, and the original cycle length model is improved. By comparing the detays of the 2 optimized signal control models, the applicable conditions of the optimized signal control models are discussed. Finally, taking Tanxi Road/C example, the effectiveness of the presented hanghong Road roundabout in Xiangcheng, Xiangyang as an optimized control models is verified.