A Hierarchical Test Platform for Vision Language Model (VLM)-Integrated Real-World Autonomous Driving

Vision-Language Models (VLMs) have demonstrated significant promise for autonomous driving due to their powerful multimodal reasoning capabilities. However, adapting VLMs from generic data to safety-critical driving contexts introduces a notable challenge known as domain shift. Existing simulation-based and dataset-driven evaluation approaches struggle to accurately replicate real-world complexities, lacking repeatable closed-loop evaluation and flexible scenario manipulation. Furthermore, current real-world testing platforms typically focus on isolated modules and do not support comprehensive interaction with VLM-based systems. Consequently, there is a critical need for a holistic testing architecture capable of integrating perception, planning, and control modules, accommodating VLM-based systems, and supporting configurable real-world testing scenarios. In this article, we address this critical gap by proposing a hierarchical real-world test platform specialized in the rigorous evaluation of VLM-integrated autonomous driving systems. Specifically, our platform features have: a lightweight, structured, and low-latency middleware pipeline specialized for seamless VLM integration; a hierarchical modular architecture enabling flexible substitution between conventional and VLM-based autonomy components, providing exceptional deployment flexibility for rapid experimentation; and sophisticated closed-loop scenario-based testing capabilities on a controlled test track, facilitating comprehensive evaluation of the entire full-stack VLM-integrated autonomous driving pipeline, from perception, reasoning, decision-making, and planning to final vehicle maneuvers. Through an extensive real-world case study, we demonstrate the effectiveness of our platform in evaluating the performance and robustness of VLM-integrated autonomous driving under diverse realistic conditions. Project page and codes: https://github.com/YupengZhouPurdue/VLMTest.