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Reinforcement learning (RL) holds significant promise for adaptive traffic signal control. While existing RL-based methods demonstrate effectiveness in reducing vehicular congestion, their predominant focus on vehicle-centric optimization…

Machine Learning · Computer Science 2025-07-24 Bibek Poudel , Xuan Wang , Weizi Li , Lei Zhu , Kevin Heaslip

Traffic Signal Control (TSC) aims to reduce the average travel time of vehicles in a road network, which in turn enhances fuel utilization efficiency, air quality, and road safety, benefiting society as a whole. Due to the complexity of…

Computer Vision and Pattern Recognition · Computer Science 2023-06-14 Junfan Lin , Yuying Zhu , Lingbo Liu , Yang Liu , Guanbin Li , Liang Lin

Reinforcement Learning (RL) in Traffic Signal Control (TSC) faces significant hurdles in real-world deployment due to limited generalization to dynamic traffic flow variations. Existing approaches often overfit static patterns and use…

Artificial Intelligence · Computer Science 2026-03-13 Sheng-You Huang , Hsiao-Chuan Chang , Yen-Chi Chen , Ting-Han Wei , I-Hau Yeh , Sheng-Yao Kuan , Chien-Yao Wang , Hsuan-Han Lee , I-Chen Wu

Reinforcement learning-based traffic signal control (RL-TSC) has emerged as a promising approach for improving urban mobility. However, its robustness under real-world disruptions such as traffic incidents remains largely underexplored. In…

Machine Learning · Computer Science 2025-06-18 Dang Viet Anh Nguyen , Carlos Lima Azevedo , Tomer Toledo , Filipe Rodrigues

Urban traffic congestion, particularly at intersections, significantly affects travel time, fuel consumption, and emissions. Traditional fixed-time signal control systems often lack the adaptability to effectively manage dynamic traffic…

Artificial Intelligence · Computer Science 2025-12-01 Saahil Mahato

Safe and efficient autonomous driving in dense traffic is fundamentally a decentralized multi-agent coordination problem, where interactions at conflict points such as merging and weaving must be resolved reliably under partial…

Robotics · Computer Science 2026-03-02 Xiaotong Zhang , Gang Xiong , Yuanjing Wang , Siyu Teng , Alois Knoll , Long Chen

Model free reinforcement learning (RL) provides a potential alternative to earlier formulations of adaptive transit signal priority (TSP) algorithms based on mathematical programming that require complex and nonlinear objective functions.…

Machine Learning · Computer Science 2024-08-02 Dickness Kwesiga , Angshuman Guin , Michael Hunter

Optimizing traffic signal control (TSC) at intersections continues to pose a challenging problem, particularly for large-scale traffic networks. It has been shown in past research that it is feasible to optimize the operations of individual…

Machine Learning · Computer Science 2021-10-13 Paul , Ha , Sikai Chen , Runjia Du , Samuel Labi

Traffic congestion in modern cities is exacerbated by the limitations of traditional fixed-time traffic signal systems, which fail to adapt to dynamic traffic patterns. Adaptive Traffic Signal Control (ATSC) algorithms have emerged as a…

Multiagent Systems · Computer Science 2025-04-01 Anirudh Satheesh , Keenan Powell

Traffic congestion in metropolitan areas is a world-wide problem that can be ameliorated by traffic lights that respond dynamically to real-time conditions. Recent studies applying deep reinforcement learning (RL) to optimize single traffic…

Machine Learning · Computer Science 2019-12-10 Zhi Zhang , Jiachen Yang , Hongyuan Zha

This paper presents a mixed traffic control policy designed to optimize traffic efficiency across diverse road topologies, addressing issues of congestion prevalent in urban environments. A model-free reinforcement learning (RL) approach is…

Robotics · Computer Science 2025-01-29 Chuyang Xiao , Dawei Wang , Xinzheng Tang , Jia Pan , Yuexin Ma

The optimization of traffic signal control (TSC) is critical for an efficient transportation system. In recent years, reinforcement learning (RL) techniques have emerged as a popular approach for TSC and show promising results for highly…

Artificial Intelligence · Computer Science 2023-11-28 Jianxiong Li , Shichao Lin , Tianyu Shi , Chujie Tian , Yu Mei , Jian Song , Xianyuan Zhan , Ruimin Li

Traffic signal control is a challenging real-world problem aiming to minimize overall travel time by coordinating vehicle movements at road intersections. Existing traffic signal control systems in use still rely heavily on oversimplified…

Artificial Intelligence · Computer Science 2022-08-09 Chi-Chun Chao , Jun-Wei Hsieh , Bor-Shiun Wang

Traffic signal control (TSC) is a high-stakes domain that is growing in importance as traffic volume grows globally. An increasing number of works are applying reinforcement learning (RL) to TSC; RL can draw on an abundance of traffic data…

Artificial Intelligence · Computer Science 2022-10-05 Rex Chen , Fei Fang , Norman Sadeh

With the increasing availability of traffic data and advance of deep reinforcement learning techniques, there is an emerging trend of employing reinforcement learning (RL) for traffic signal control. A key question for applying RL to…

Machine Learning · Computer Science 2019-05-14 Guanjie Zheng , Xinshi Zang , Nan Xu , Hua Wei , Zhengyao Yu , Vikash Gayah , Kai Xu , Zhenhui Li

We introduce Traffic-R1, a 3B-parameter foundation model with human-like reasoning for Traffic signal control (TSC), developed via self-exploration and iterative reinforcement of LLM with expert guidance in a simulated traffic environment.…

Artificial Intelligence · Computer Science 2025-10-23 Xingchen Zou , Yuhao Yang , Zheng Chen , Xixuan Hao , Yiqi Chen , Chao Huang , Yuxuan Liang

Over the years, reinforcement learning has emerged as a popular approach to develop signal control and vehicle platooning strategies either independently or in a hierarchical way. However, jointly controlling both in real-time to alleviate…

Machine Learning · Computer Science 2025-08-13 Xianyue Peng , Shenyang Chen , Hang Gao , Hao Wang , H. Michael Zhang

Traffic congestion in dense urban centers presents an economical and environmental burden. In recent years, the availability of vehicle-to-anything communication allows for the transmission of detailed vehicle states to the infrastructure…

Traffic congestion remains a significant challenge in modern urban networks. Autonomous driving technologies have emerged as a potential solution. Among traffic control methods, reinforcement learning has shown superior performance over…

Machine Learning · Computer Science 2025-07-29 Songyang Liu , Muyang Fan , Weizi Li , Jing Du , Shuai Li

The heavy traffic congestion problem has always been a concern for modern cities. To alleviate traffic congestion, researchers use reinforcement learning (RL) to develop better traffic signal control (TSC) algorithms in recent years.…

Machine Learning · Computer Science 2020-09-18 Chang Liu , Huichu Zhang , Weinan Zhang , Guanjie Zheng , Yong Yu