A pileup is a horrible thing, but the real danger often doesn't start when you hit the car in front of you, but after. Conditions could still be terrible, and you're stuck, stationary, in the middle of a highway. It's one of the most dangerous places to be in the automotive world.
In the Minnesota pileup video we saw earlier today, people hopped out of their cars as quick as possible, the guy holding the camera ran back to his vehicle to get something to help a fellow motorist, and general mayhem seemed to rule. What was everyone supposed to do?