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Does radar change the AI Driver’s behaviour? Useful simulation for autonomy needs to go beyond camera realism. GAIA-4 extends this capability with multimodal generation, bringing radar into the simulation alongside cameras. Radar is particularly important for redundancy and safety-critical sensing, providing robustness in adverse conditions such as fog, spray, and low light, where visibility is poor. With this multimodality established, we can start to understand radar’s impact on model performance by simulating scenarios with and without it. In most cases, the addition of radar measurably shifts the closed-loop trajectory, providing evidence that the generated radar carries decision-relevant information and ensures the vehicle decelerates appropriately. https://lnkd.in/eSyJw4CV