Replying to MikeMac:
Then those people from up north or the guys with 4-wheel drive who think they can drive in any snow come flying along at or near the speed limit and begin bouncing off things like a steel ball in a pinball machine.
When learning to drive, one of the things covered is the best practice of being able to stop when cresting a blind hill. This is especially true during bad weather. In general, losing control of a vehicle means the person was driving beyond their capabilities.
I have several trucks. One of them just has no grip on wet or ice. I believe the problem is the tires (which came with the truck). The others have much better traction.
For any given snow here, most of the vehicles in the ditch are FWD or SUVs, although I did see a Camaro spin out recently. Mostly, the RWD trucks and sports cars drive on by. 4WD is dangerous on ice--particularly certain setups.