快速路网单点入口匝道动态控制策略仿真评价研究

Simulation Study of the Local Dynamic Ramp Metering Control Strategy Evaluation for Freeway Networks

有别于以往工作,运用宏观交通网络动态建模理论与计算机仿真技术,以快速路网为考察对象,提出单点入口匝道动态控制策略的宏观交通仿真评价方法,设计了一种基于ALINEA原理的单点入口匝道动态控制算法,针对一多起点-多终点拥挤路网,开发仿真系统,给出控制前后路段交通状态时变图、全局路网交通状态图等可视化仿真结果,描述路网交通流演化,定量评价匝道控制效果。算例表明,控制后路网拥堵显著缓解,网络总耗时减少约5%。研究显示了单点匝道控制策略宏观交通仿真评价方法有助于深刻、全面、直观地理解路网交通流演化,剖析拥堵成因,设计符合全局、系统眼光的高效控制策略,给出定量评价,具有有效性与优越性。

In this study,we apply macroscopic network flow modeling approach and simulation technique to propose a simulation approach to evaluating the local ramp metering strategy for freeway networks,and design an ALINEA based ramp metering strategy.In the simulation case study,we investigate the link-level traffic condition and the network-level traffic congestion evolution before and after control,and quantitatively assess the effect of ramp metering.The total time spent after control is reduced by about 5%.The study results show that the proposed evaluation approach can facilitate better understanding network traffic flow process and examining the cause of congestion and thus establishing effective control strategies.