When it's not safe to drive, it's not safe to drive.

I've been in zero-road-speed whiteout conditions several times. The only move to make is to the side of the road without getting stuck, and turning on your flashers.

Low-light cameras would not have worked. Sonar would not have worked. Infrared would not have worked.

I think the weather where cameras/sensors start having problems is much better than zero-vis whiteout.

If we could make sensors that lets an autonomous vehicle drive reliably in any snow/rain where a human could drive (although carefully) then we're good. But we are a long way from that. Especially since a lot of sensor tech like cameras tend to fail in 2 ways, both through their performance being worse in adverse condition but also simply failing to function at all if they are covered in ice/snow/water.

Radar might still have worked