Sometimes when the snow builds up, the safest driving is to be in the “lane” made by heavy travel that blows the snow to the sides. Staying in the real lane would make for hard and likely dangerous driving.

No argument or anything here, just saying what I think is an interesting nuance as someone who has spent a lot of life driving in snowy places.

I’m in Denver now and it’ll be really interesting to see how these things handle the effects of a real storm. If I had to make a guess it would be that they’ll all just stop driving for a day or two.

Do you understand that what you have said, this behavior of using the absolute true position of the lanes when all the human drivers are using a different emergent from snow-paths lane, will cause accidents? Doing the "right" thing is wrong when it is different from what humans all do.