Joe, that's great for people with 4WD. However, not all of us can afford such a vehicle (or don't work such that we have to have one), and I believe fixer's question was about what to do if your vehicle isn't driveable, for whatever reason.
I've never lived in blizzard country, but I've heard over and over to stay in the vehicle. Assuming, of course, that it's not on fire and not such a twisted wreck that being inside it would be a hazard. If you told someone where you were going and when, and you fail to arrive, people will start looking for you on that road.
If your vehicle is intact but just stuck, you have a cozy wind-and waterproof shelter, and you can run the heater intermittently for as long as you have gas. Just have to remember to keep the snow cleared from the grill and exhaust so your engine can breathe. I'd tie a bunch of bright orange ribbon onto the antenna, so if anyone else came driving by, I'd be a little more obvious.
If the vehicle is a twisted burning wreck, assuming I also got my coat and the tarp I always keep in the trunk, I'd move a short distance away and build a snow/tarp shelter, start a fire, and hunker down. If any of the panels on the car survived and I could get them off without too much trouble, I'd use those in the shelter as well. I'd be hesitant to use the fabric/carpet/stuffing in the car for fuel, as a lot of it is synthetic and would just melt while giving off nasty fumes. Better to put it between you and the ground.
About the only things I imagine I would wish I had were more food and a satellite phone. A book, maybe - could burn it if I had to.