I have about a 200 foot driveway. My tractor is buried out in the back yard because there's no room in the garage (filled with stacks of cedar siding for the house.) I just spent all day with a shovel, the snow, and a 6 month old yellow Lab attacking the shovelfuls of snow. I'd guess there is a bit over 12 inches in the driveway which my POS tractor and plow wouldn't push through anyways.
The driveway was the easy part. The fact that the plow truck came through and dumped about 30 inches deep into the end of the driveway means that I shovel or I wait for it to melt. My car won't get through that stuff.