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DynLight: Realize dynamic phase duration with multi-level traffic signal control

2022-04-07 14:39:38
Liang Zhang, Shubin Xie, Jianming Deng

Abstract

Adopting reinforcement learning (RL) for traffic signal control is increasingly popular. Most RL methods use fixed action interval (denoted as tduration) and actuate or maintain a phase every tduration, which makes the phase duration less dynamic and flexible. In addition, the actuated phase can be arbitrary, affecting the real-world deployment, which requires a fixed cyclical phase structure. To address these challenges, we propose a multi-level traffic signal control framework, DynLight, which uses an optimization method Max-QueueLength (M-QL) to determine the phase and uses a deep Q-network to determine the corresponding duration. Based on DynLight, we further propose DynLight-C that adopts a well trained deep Q-network of DynLight and replace M-QL by a fixed cyclical control policy that actuate a set of phases in fixed order to realize cyclical phase structure. Comprehensive experiments on multiple real-world datasets demonstrate that DynLight achives a new state-of-the-art. Furthermore, the deep Q-network of DynLight can learn well on determining the phase duration and DynLight-C demonstrates high performance for deployment.

Abstract (translated)

URL

https://arxiv.org/abs/2204.03471

PDF

https://arxiv.org/pdf/2204.03471.pdf


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