I drove a Miata 300 miles through the aftermath of a blizzard in winter of 2010. When I got to the PA border, there were signs that the highway was "closed" (but ironically, no way to actually exit and U-turn since the ramps weren't plowed so I kept going). The Miata on Graspics was the only thing NOT sliding around. Ended up in NJ (which had plowed the roads to perfection) 5-6 hours later with a very full bladder.

Caveat: they're low cars, and I found some damage to the bottom of the air intake dam after that trip.