In New York, at least, it's illegal to drive around with snow on your roof. I mentioned that we used to get 7 feet of snow a year--it wasn't uncommon to see someone drive down the road with a good foot of snow on top of their car, which would eventually fly off and smack another driver's windshield. That's why they made it illegal to do so. Then there were the people who would scratch a small "peephole" out of the ice on their windshield--probably also illegal (poor visibility), but you'd see it all the time.
Digging out after they would plow was a whole 'nother issue. We were lucky--we knew the plow guys, they'd be nice to us. But, woe betide the guy who used his snowblower to push snow into the street--the snow plows would plow it (and him) right back in.
Of course, where I live now, we got 2" of snow, and my kids got 4 days off from school. My NY friends had a real good chuckle at that one.