In worst cases the road turns from a 2 lane road to a 1.5-1.8 lane road when there's enough snow on the banks. Multi-lane motorways turn from 4 lanes to 2-8-3.5 lanes. Humans have trouble navigating that, dunno how any FSD system would manage it in our lifetime.
Also sometimes the "lanes" that form on the road can cross the center divider to the oncoming lane, which is really dangerous if you're not paying attention. I almost hit an oncoming semi-truck just one day because of this. It's an example of a rare edge case.
In worst cases the road turns from a 2 lane road to a 1.5-1.8 lane road when there's enough snow on the banks. Multi-lane motorways turn from 4 lanes to 2-8-3.5 lanes. Humans have trouble navigating that, dunno how any FSD system would manage it in our lifetime.