A Two-Level Rolling Optimization Model for Real-time Adaptive Signal Control

• Main Authors: Zhihong Yao, Yibing Wang, Wei Xiao, Bin Zhao, Bo Peng
• Format: Article
• Language: English
• Published: MDPI AG 2019-02-01
• Series: Algorithms
• Subjects: adaptive signal control; dynamic programming; integer linear programming; rolling strategy; vehicle delays
• Online Access: https://www.mdpi.com/1999-4893/12/2/38

Recently, dynamic traffic flow prediction models have increasingly been developed in a connected vehicle environment, which will be conducive to the development of more advanced traffic signal control systems. This paper proposes a rolling optimization model for real-time adaptive signal control based on a dynamic traffic flow model. The proposed method consists of two levels, i.e., barrier group and phase. The upper layer optimizes the length of the barrier group based on dynamic programming. The lower level optimizes the signal phase lengths with the objective of minimizing vehicle delay. Then, to capture the dynamic traffic flow, a rolling strategy was developed based on a real-time traffic flow prediction model. Finally, the proposed method was compared to the Controlled Optimization of Phases (COP) algorithm in a simulation experiment. The results showed that the average vehicle delay was significantly reduced, by as much as 17.95%, using the proposed method.