Research  in Symbiotic Transportation explores metacognition to allow an agent not only to act, but to assess how well it is acting, why it is acting in a particular way, and when it should revise its internal models or seek human input. Projects under this theme explore how metacognitive AI serves as the engine that powers multimodal digital twin analyses across humans, autonomy, and physical spaces. By advancing biomimetic mechanisms for introspection, metacognitive AI allows autonomous agents (e.g. autonomous vehicles) to actively perceive, learn from, and interact with their surrounding environment. This intrinsically-driven approach contrasts sharply with current methods that rely on extrinsic human feedback for rewards.