Abstract:

In order to relieve the traffic congestion of the central area in an urban road network, a multi- region perimeter control strategy based on networks with a closed superblock was proposed. The urban road network was first divided into three subregions: a central area, a suburb area, and a closed superblock. The dynamic equilibrium equations of traffic flows among three subregions were established based on the Macroscopic Fundamental Diagram (MFD). A multi-region perimeter control model was constructed by considering the route choice behavior of vehicles, in which the objective function was to maximize the trip completion rate of the central area, and the control variables were the toll charged and the number of gates at the perimeters. A numerical case according to the real data was used to verify the validity of the proposed model. The results indicate that the service capacity of the central area under the proposed perimeter control method is 7% higher than that without the perimeter control. The proposed perimeter control model can effectively improve the uniformity of traffic density distribution among regions to enhance the network service capacity. It is an effective and practical way to carry out the perimeter control by changing the number of gates of superblocks.

Key words: urban traffic, superblocks, perimeter control, urban road network, macroscopic fundamental diagram

摘要：

为缓解城市中心区交通拥堵状况，提出基于超级街区的路网多子区边界控制策略. 将城市区域路网划分为中心区、郊区及超级街区3个子区，结合宏观基本图(MFD)建立各子区交通流动态平衡方程；以中心区车辆出行完成率最高为目标，以边界收费费率和出、入口数量为控制变量，建立考虑车辆通道选择行为的路网多子区边界控制优化模型；并以实际路网数据为算例验证模型有效性.结果表明：边界控制策略下的中心区服务能力比无边界控制提高 7%；利用超级街区实现路网边界控制能够有效改善区域交通密度分布均衡性，提升路网服务效率；通过改变超级街区出、入口数量，实现边界控制兼备有效性和实践性.

关键词: 城市交通, 超级街区, 边界控制, 城市路网, 宏观基本图(MFD)