Your concern about relying solely on optical sensors for autonomous driving in challenging conditions is certainly understandable. However, it's important to remember that humans drive without technologies like LiDAR or radar and generally cope well, despite similar limitations. These AI systems are specifically designed to emulate this human adaptability, adjusting speed and implementing safety measures as visibility worsens. Additionally, it's worth noting that LiDAR and radar sensors also struggle in poor weather conditions. Thus, the reliance on advanced optical technologies may not be as impractical as it seems. The AI's capability to adapt and learn from a variety of driving scenarios significantly mitigates the lack of other sensors.