They don't get that deep at our cabin...but sometimes higher than the mirrors on my eXcursion. We say the roads are "plowed" but they are actually blown with some big-a** snowblowers. And cute little ones mounted to skid-steers. On a couple occasions when I couldn't plow our driveway with the jeep, I've called one of the operators and he's blown it out.
When the sides are that high, going down the hills you feel like you're on a luge. Also...it sucks when you're on a snowmobile and you have to transition from a road that isn't plowed. Sucks worse to get back out.