Thinking about how to prepare for this situation:

1. Start with a safe, well-built and properly maintained vehicle, (I don't do compacts, subcompacts or econoboxes);
2. RescueMe attached to seatbelt gearshift lever;
3. Small first aid kit in pocket;
4. Small flashlight and Leatherman Micra or SAK on keyring;
5. Comprehensive first aid/trauma kit in rear of vehicle;
6. Fire extinguisher securely mounted in rear of vehicle;
7. Flares or reflective triangles in vehicle emergency kit;
8. Cell in pocket or CB Radio to call emergency services;
9. BOB/72Hr kit with extra clothing, poncho and blanket for warmth;
10. Brighter flashlights in BOB and Vehicle Emergency Kit;
11. Phone in pocket or camera in BOB to shoot photo/video of scene, damage and documents;
12. Phone voice recorder to record other driver's and witness statements;
13. iPhone Auto Accident app or notepad and pen to document other driver and witness information.

What about some actions you can take just before the accident occurs? Like standing hard on the brakes, even though you know its too late? Closing your eyes to keep airbag powder, glass fragments and debris out? Removing your hands from the steering wheel and placing them in your lap? Bracing yourself against your seatback? Any advice from the pros on this site on whether these things are effective in the real world?