展宽段排队溢出状态下区段延误模型研究

Study on Section Delay Model under Widening Zone Queue Overflow Condition

为研究过饱和信号交叉口排队溢出状态下单周期通过展宽段车辆的区段延误模型,首先介绍了3大经典延误模型,提出了3大延误模型均未考虑展宽段长度和饱和流率的波动问题。其次,以展宽段为研究对象,在经典延误模型理论的基础上,推导出了展宽段区段延误模型。最后,从公式推导计算和VISSIM仿真两个方面对优化模型和定数理论延误模型进行了对比。结果表明:该模型能够有效地反映展宽段溢出状态下产生的区段延误,可为展宽段的科学设计提供理论基础。

In order to study the section delay model for vehicles passing widening zone in single cycle at oversaturated signalized intersection under queue overflow condition,first,we introduced 3 classical delay models,and put forward none of them considered the widening zone length and the fluctuation of saturation flow rate. Second,taking the widening zone as the research object,we derived the widening zone delay model on the basis of the classical delay model theory. Finally,we compared the optimization model and the fixed number theory based delay model by formula deriving / calculating and VISSIM simulation. The result shows that the proposed model can effectively reflect the section delay in widening zone under queue overflow condition,it can provide a theoretical basis for scientific design of widening zone.