基于可逆车道的菱形立交交叉口车道设置及信号配时优化研究

Research on Lane Setting and Signal Timing Optimization of Diamond Interchanges Based on Reversible Lane

菱形立交是城市内常用的一种立交形式,为了提升衔接区域交叉口的服务水平,本文提出了基于可逆车道的菱形立交交叉口信号控制方法.可逆车道应用于内部路段所有左转车道和地面出口道的部分车道上,传统控制方法无法保证内部路段车辆被及时清空,安全隐患较大,故在分析了可逆车道设置条件,考虑内部路段的及时清空和排队长度控制以及相位方案等约束条件后建立了配时优化模型,并基于枚举法求解.通过算例及VISSIM仿真对方法的可行性和效果进行了验证,并与传统信号控制方法进行对比,发现前者在高水平交通需求下显著优于后者,使得交叉口处总通过车辆数提高了2.0%,车均延误降低了52.7%,出口匝道上的最大排队长度减少了62%以上.

Signalized diamond interchanges(SDT)are widely used interchange patterns in urban areas.To improve the level of service of the junction area,this paper presents an optimization methodology for SDI based on reversible lanes,which are applied to all of the left-turn lanes in the internal link and to certain exit lanes on surface streets.Traditional control methods are unable to clear vehicles in the internal link in time,which can result in confusion and danger.To address this problem,after analyzing the setting conditions of reversible lanes and considering the constraints of timely clearing and queuing length control in the internal link and phase scheme,a signal timing model is established in this paper,and solved by an enumeration method.Results from numerical examples and VTSSTM software simulations verify the feasibility and effectiveness of this method.When the demand level is high,this method clearly outperforms the traditional TTT control method with higher total throughput(2.0%),lower average delays(52.7%),and lower maximum queue length on off-ramps(more than 62%).