Abstract
Exploring efficient control strategies for heterogeneously congested urban networks remains a big research challenge. The theory of macroscopic fundamental diagram (MFD) provides a new perspective for network-wide congestion control decisions. This paper proposes a coordinated perimeter control strategy for multiregion heterogeneous networks based on optimized transfer flows. First, a two-layer network partitioning method is presented to capture spatial heterogeneity dynamics of urban networks. For this partition, traffic flow equilibrium model based on MFD and multiagent based hierarchical traffic management scheme are built. Then, an improved multinomial logit model is developed for deriving optimized transfer flows among multiple congested regions. A coordinated perimeter control strategy using model predictive control is further proposed, which is aimed at tracking desired accumulations of each congested region. As a case study, the proposed control strategy is applied to the downtown network of Jinan, China, using simulation analysis. The results demonstrate that it can achieve balanced network flow distribution and increased mobility.
Highlights
Regional and even global traffic congestion patterns have become the norm in large- and medium-sized cities
Recent studies have demonstrated that macroscopic fundamental diagram (MFD) is a powerful modeling tool for network-level traffic management strategies, such as perimeter control [3,4,5], congestion pricing [6, 7], and route guidance [8, 9], as it provides aggregated relationships between macroscopic traffic variables and simplifies complexity of traffic flow dynamics [10, 11]
A transfer flow optimization model of multiple congested regions is developed based on multinomial logit (MNL) model, considering real-time accumulation states and spatial distances of adjacent regions. ird, a coordinated perimeter control strategy based on optimized transfer flows is proposed to operate urban network system close to dynamic traffic equilibrium
Summary
Regional and even global traffic congestion patterns have become the norm in large- and medium-sized cities. Recent studies have demonstrated that macroscopic fundamental diagram (MFD) is a powerful modeling tool for network-level traffic management strategies, such as perimeter control [3,4,5], congestion pricing [6, 7], and route guidance [8, 9], as it provides aggregated relationships between macroscopic traffic variables and simplifies complexity of traffic flow dynamics [10, 11]. A networkwide model predictive control (MPC) scheme with integrated perimeter control and regional route guidance was developed to improve mobility in urban networks [28] These strategies are studied based on the idealized road network partitions. In this framework, multiregion transfer flow optimization model and coordinated perimeter control strategy are further developed. Multiregion perimeter control method is applied to the downtown network of Jinan City in Section 4. e last section concludes this paper and identifies future research directions
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