信号控制交叉口U-turn设计及延误模型

城市道路信号控制交叉口左转车流是造成交叉口冲突和拥挤,以至于形成交通瓶颈的主要原因之一。通过分析实施U-turn的交通效益和影响因素,利用稳态模型、过渡函数和可插间隙理论建立了基于交叉口车均延误和U-turn行程时间的延误模型。最后利用实例,得到U-turn设计可使饱和度最高下降29%,车均延误最高下降63%,从而使交叉口服务水平有较大提高。

On U-turn Design of Signal Control Intersection and Its Delay Model

Left turn traffic flow controlled by urban road signal at intersections is one of main factors of conflicts and congestions. Through an analysis of U-turn traffic benefits and influence factors, the delay model is established on the basis of vehicles average delay and U- turn running time by use of steady-state model,transition function and available gap theory. Finally, taking a practical case for example, U-turn design can be demonstrated to improve the service of intersections to a large extend through decreasing saturation degree by 29% at most and decreasing vehicles average delay by 63% maximally.