arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2604.23902cs.AI
收藏

基于LSTM的交通信号控制与大语言模型增强的交通状态预测与安全约束决策支持

LLM-Augmented Traffic Signal Control with LSTM-Based Traffic State Prediction and Safety-Constrained Decision Support

Tandon School of Engineering, New York University(纽约大学Tandon工程学院)

Jiazhao Shi

AI总结:

本文提出一种结合LSTM交通状态预测和大语言模型的交通信号控制框架,通过预测信号相位和生成自然语言解释,提升交通效率并确保安全约束。

摘要:

交通信号控制是智能交通系统中的关键任务,但传统固定时间与规则方法难以适应动态交通需求且缺乏决策可解释性。本文提出一种集成LSTM短期交通状态预测、预测相位选择、结构化大语言模型推理和安全约束动作过滤的LLM增强交通信号控制框架。LSTM模块基于最近的交叉口观测预测未来排队长度、等待时间、车辆数和车道占用情况。预测控制器生成候选信号动作,而LLM模块利用结构化交通状态输入评估这些动作,生成拥堵诊断、相位调整建议和自然语言解释。为确保操作可靠性,所有LLM生成的建议均通过安全过滤器验证后执行。SUMO基于仿真实验比较了所提方法与固定时间控制、规则控制和LSTM预测基线在平衡需求、方向峰值需求和突发激增场景下的性能。结果表明,所提框架在动态和非周期性交通条件下提高了交通效率,同时在安全过滤后保持零约束违反。总体而言,本文表明当大语言模型用作受约束推理和决策支持模块而非直接低层控制器时,可增强交通信号控制。关键词:智能交通系统;交通信号控制;大语言模型;LSTM;交通状态预测;决策支持;安全约束控制;SUMO仿真。

英文摘要:

Traffic signal control is a critical task in intelligent transportation systems, yet conventional fixed-time and rule-based methods often struggle to adapt to dynamic traffic demand and provide limited decision interpretability. This study proposes an LLM-augmented traffic signal control framework that integrates LSTM-based short-term traffic state prediction, predictive phase selection, structured large language model reasoning, and safety-constrained action filtering. The LSTM module forecasts future queue length, waiting time, vehicle count, and lane occupancy based on recent intersection-level observations. A predictive controller then generates candidate signal actions, while the LLM module evaluates these actions using structured traffic-state inputs and produces congestion diagnoses, phase adjustment recommendations, and natural-language explanations. To ensure operational reliability, all LLM-generated recommendations are validated by a safety filter before execution. Simulation-based experiments in SUMO compare the proposed method with fixed-time control, rule-based control, and an LSTM-based predictive baseline under balanced demand, directional peak demand, and sudden surge scenarios. The results indicate that the proposed framework improves traffic efficiency, especially under dynamic and non-recurrent traffic conditions, while maintaining zero constraint violations after safety filtering. Overall, this study demonstrates that LLMs can enhance traffic signal control when used as constrained reasoning and decision-support modules rather than direct low-level controllers. Keywords: Intelligent Transportation Systems; Traffic Signal Control; Large Language Models; LSTM; Traffic State Prediction; Decision Support; Safety-Constrained Control; SUMO Simulation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑