Of course if’s best to avoid dangerous conditions, but you must realize that weather changes fast and a clear road can become very low visibility in the matter of minutes. There are also urgent and emergency situations where it’s rational to take the weather risk and drive much more cautiously than the alternative. Finally the issue is not strictly visibility it’s more the pavement condition. Autonomous drivers can’t “feel” the road the way a human can, at least not yet, so conditions that a human could safely cautiously navigate just aren’t safe for a non-human right now.
