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State-of-the-art (SOTA) urban traffic control increasingly employs Multi-Agent Reinforcement Learning (MARL) to coordinate Traffic Light Controllers (TLCs) and Connected Autonomous Vehicles (CAVs). However, the performance of these systems…

Multiagent Systems · Computer Science 2026-04-16 Yuyang Chen , Kaiyan Zhao , Yiming Wang , Ming Yang , Bin Rao , Zhenning Li

Traffic signal control (TSC) is a complex and important task that affects the daily lives of millions of people. Reinforcement Learning (RL) has shown promising results in optimizing traffic signal control, but current RL-based TSC methods…

Machine Learning · Computer Science 2023-10-31 Longchao Da , Hao Mei , Romir Sharma , Hua Wei

Since conventional approaches could not adapt to dynamic traffic conditions, reinforcement learning (RL) has attracted more attention to help solve the traffic signal control (TSC) problem. However, existing RL-based methods are rarely…

Machine Learning · Computer Science 2021-12-07 Qiang Wu , Liang Zhang , Jun Shen , Linyuan Lü , Bo Du , Jianqing Wu

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

Multi-agent Deep Reinforcement Learning (MADRL) based traffic signal control becomes a popular research topic in recent years. To alleviate the scalability issue of completely centralized RL techniques and the non-stationarity issue of…

Artificial Intelligence · Computer Science 2023-09-08 Hankang Gu , Shangbo Wang , Xiaoguang Ma , Dongyao Jia , Guoqiang Mao , Eng Gee Lim , Cheuk Pong Ryan Wong

Recent years have witnessed substantial growth in adaptive traffic signal control (ATSC) methodologies that improve transportation network efficiency, especially in branches leveraging artificial intelligence based optimization and control…

Systems and Control · Electrical Eng. & Systems 2022-11-29 Xiaoyu Wang , Scott Sanner , Baher Abdulhai

Appropriate traffic state representation is crucial for learning traffic signal control policies. However, most of the current traffic state representations are heuristically designed, with insufficient theoretical support. In this paper,…

Machine Learning · Computer Science 2025-03-27 Xiao-Cheng Liao , Yi Mei , Mengjie Zhang , Xiang-Ling Chen

Urban traffic control is a system-level coordination problem spanning heterogeneous subsystems, including traffic signals, freeways, public transit, and taxi services. Existing optimization-based, reinforcement learning (RL), and emerging…

Artificial Intelligence · Computer Science 2026-04-21 Siqi Lai , Pan Zhang , Yuping Zhou , Jindong Han , Yansong Ning , Hao Liu

Traffic simulations are commonly used to optimize urban traffic flow, with reinforcement learning (RL) showing promising potential for automated traffic signal control, particularly in intelligent transportation systems involving connected…

Systems and Control · Electrical Eng. & Systems 2025-09-19 Talha Azfar , Kaicong Huang , Andrew Tracy , Sandra Misiewicz , Chenxi Liu , Ruimin Ke

Traffic signal control (TSC) is a core challenge in urban mobility, where real-time decisions must balance efficiency and safety. Existing methods - ranging from rule-based heuristics to reinforcement learning (RL) - often struggle to…

Systems and Control · Electrical Eng. & Systems 2025-12-12 Maonan Wang , Yirong Chen , Aoyu Pang , Yuxin Cai , Chung Shue Chen , Yuheng Kan , Man-On Pun

Traffic signal control (TSC) is crucial for reducing traffic congestion leading to smoother traffic flow, reduced idle time, and mitigated CO2 emissions. In this paper, we explore the computer vision approach for TSC that modulates on-road…

Computer Vision and Pattern Recognition · Computer Science 2025-11-27 Pan He , Quanyi Li , Xiaoyong Yuan , Bolei Zhou

Reinforcement learning (RL) has attracted increasing interest for adaptive traffic signal control due to its model-free ability to learn control policies directly from interaction with the traffic environment. However, several challenges…

Machine Learning · Computer Science 2026-03-17 Dickens Kwesiga , Angshuman Guin , Khaled Abdelghany , Michael Hunter

Traffic Signal Control (TSC) plays a critical role in urban traffic management by optimizing traffic flow and mitigating congestion. While Large Language Models (LLMs) have recently emerged as promising tools for TSC due to their…

Machine Learning · Computer Science 2025-03-18 Zirui Yuan , Siqi Lai , Hao Liu

Reinforcement learning (RL) is a promising data-driven approach for adaptive traffic signal control (ATSC) in complex urban traffic networks, and deep neural networks further enhance its learning power. However, centralized RL is infeasible…

Machine Learning · Computer Science 2019-03-13 Tianshu Chu , Jie Wang , Lara Codecà , Zhaojian Li

Deep Reinforcement Learning (DRL) uses diverse, unstructured data and makes RL capable of learning complex policies in high dimensional environments. Intelligent Transportation System (ITS) based on Autonomous Vehicles (AVs) offers an…

Machine Learning · Computer Science 2022-06-30 Anum Mushtaq , Irfan ul Haq , Muhammad Azeem Sarwar , Asifullah Khan , Omair Shafiq

In urban environments, the complex and uncertain intersection scenarios are challenging for autonomous driving. To ensure safety, it is crucial to develop an adaptive decision making system that can handle the interaction with other…

Robotics · Computer Science 2022-07-26 Xianqi He , Lin Yang , Chao Lu , Zirui Li , Jianwei Gong

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

The management of mixed traffic that consists of robot vehicles (RVs) and human-driven vehicles (HVs) at complex intersections presents a multifaceted challenge. Traditional signal controls often struggle to adapt to dynamic traffic…

Robotics · Computer Science 2024-03-25 Dawei Wang , Weizi Li , Lei Zhu , Jia Pan

Intelligent traffic signal controllers, applying DQN algorithms to traffic light policy optimization, efficiently reduce traffic congestion by adjusting traffic signals to real-time traffic. Most propositions in the literature however…

Machine Learning · Computer Science 2021-09-30 Romain Ducrocq , Nadir Farhi

Recent advances in robotics, automation, and artificial intelligence have enabled urban traffic systems to operate with increasing autonomy towards future smart cities, powered in part by the development of adaptive traffic signal control…

Robotics · Computer Science 2026-03-27 Xibei Chen , Yifeng Zhang , Yuxiang Xiao , Mingfeng Fan , Maonan Wang , Guillaume Sartoretti