考虑进出口匝道排队约束的城市快速道路交通系统动态控制方法

An Approach to Dynamic Traffic Control System for Urban Expressway with Constraint of Queue Length of On ramp & Off ramp

城市快速道路进口匝道的超长排队对地面道路交通所造成的障碍影响，以及因出口匝道的车辆排队，而产生的主线交通自然阻塞已成为不可忽视的交通问题。以线性规划方法为基础，提出同时考虑进出口匝道排队约束、主线通行能力约束以及行驶速度约束的城市快速道路流入交通的动态控制手法，探讨在流入交通需求和路网上交通状态实时变化条件下，各约束条件对流入控制解的影响，通过简单的算例，对控制模型的有效性和基本性质加以分析。

The traffic disruption at the surface street caused by the queue length at the on ramp exceeding the allowable queue length and the traffic congestion on main lanes of the expressway due to increase in the queue length at off ramp link become significant problems of urban expressway traffic control. Based on Linear Programming approach, this paper proposes the dynamic traffic control model for urban expressway with constraints of queue length of on ramp and off ramp, constraints of capacity and travel speed of mainline. In this study, the influence of inflow solution caused by those constraints under real time change of inflow demand and traffic pattern of the road network is discussed. This research also analyzes the efficiency and basic characteristics of the proposed inflow control model through the simple numerical examples.