I was driving in convoy over closed (to non-convoy driving) mountain pass in Norway, in winter. Everything was white, you could barely see the road. Snow was so heavy that visibility stretched as far as the car before me, you couldn't see further than that. At some point a snow plug passed on the other side of the road and completely covered my windshield with snow, to the point that for a few second I had no visibility whatsoever. Good luck to cameras then.