摘要
城市道路施工封闭产生的"对称T形交叉口"采用现有的信号配时方法,无法配置出总延误最小的信号周期。通过对该交叉口绕行交通流分析,在基于分周期分信号阶段的交通流量流向调查的基础上,用比例差值法统计出了弹性交通量,以弹性交通流与左转刚性交通流争抢路权现象的明显程度为依据,来判定T形交叉口的类型。最终通过对左转信号相位时长与信号周期的比值赋初值,经过二分法反复迭代搜寻出了基于Webster法的"对称T形交叉口"的最佳信号周期。
The fully enclosed road produces ＂symmetric T-intersection＂ because of the city road construction,and the signal cycle with minimum total delay cannot be configured only by the existing signal timing.Through analyzing the bypass traffic flow at the intersection,the elasticity of traffic flow was identified and counted on the basis of traffic flow surveys in different signal phases with the proportion of the difference method.According to the apparent extent of the competition for the right of way between elastic traffic flow and left-turn rigid traffic stream,the type of T-intersection was decided.Finally,by giving the ratio of left-turn signal phase length and signal cycle initial value,with the dichotomy iterative,the best ＂symmetrical T-intersection＂ signal cycle was searched out based on the Webster method.
出处
《交通信息与安全》
2012年第6期118-121,共4页
Journal of Transport Information and Safety
关键词
T形交叉口分类
比例差值
对称T形交叉口
弹性交通流
二分法
Webster法
classification of T-intersection
proportional difference
symmetric T-intersection
flexible traffic flow
dichotomy
Webster method
