信号控制环交中心岛半径与交通运行关联性研究

环形交叉口引入信号控制后,其交通运行状况发生了很大改变.由于相关理论研究的不足,导致交叉口时空资源没有得到充分利用.文中将中心岛半径作为关键参数,研究其与信号控制环形交叉口交通运行的关联性.首先从静态分析入手,得出不同中心岛半径信号控制环交的环道排队容量;随后进行动态分析,确定信号控制基本参数值;最后评价其交通效益指标,分别通过理论分析和计算机仿真的方法研究中心岛半径对通行能力和车辆延误的影响,得出不同环交中心岛半径对信号控制环交的适用性.

Relationship Between Central Island Radius and Traffic Operation of Signalized Roundabout

After signalized control was introduced in roundabout, the traffic operation has been greatly changed. Due to the lack of the related theoretical study, the time and space resources in roundabout have not been made full use of. By taking the central island radius as the key parameter, its relationship with the traffic operation of the signalized roundabout was discussed. First, by static analysis, the different circulating road queuing capacities with different central island radiuses were obtained. Then, by dynamic analysis, the signal control parameter was decided. At last, its traffic profit index was appraised. Both the theoretical analysis and simulation were used to discuss the effect of central island radius on passing capacity and vehicle delay. The adaptability of signal control roundabout with different radiuses was obtained.