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arXiv · 2606.29097

TrafficAlign: Aligning Large Language Models for Traffic Scenario Generation

Zhi Tu·Liangkun Niu·Tianyi Zhang
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Abstract

Recent research has investigated the use of large language models (LLMs) to generate traffic scenarios for autonomous driving. However, pretrained LLMs often fail to align with real-world traffic distributions. In this work, we present TrafficAlign, an automated framework that synthesizes traffic scenarios based on real-world driving videos, performs data validation, and aligns LLMs with the synthesized scenarios. The evaluation shows that traffic scenarios generated by TrafficAlign are highly effective, revealing up to 10.8% more collisions on average across three autonomous driving models than state-of-the-art methods. Furthermore, fine-tuning these driving models with TrafficAlign-generated scenarios significantly reduced collision rates by 36.1% compared with the original models. A qualitative study using traffic datasets from six geographically diverse regions shows that TrafficAlign-generated scenarios exhibit strong alignment with corresponding traffic distributions in these regions.

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Zhi Tu, Liangkun Niu, Tianyi Zhang. 2026-06-27. TrafficAlign: Aligning Large Language Models for Traffic Scenario Generation. https://arxiv.org/abs/2606.29097

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