Two years ago I had a 25 MPH head-on collision with an 18-wheeler in Dallas. I was driving a Dodge Ram pickup. The air bags deployed and the sheet metal crumpled. Everything on the truck was bent, except for the tailgate. I stopped so quickly that my left front spindle ripped off at the ball joints, and the wheel, spindle, and miscellaneous attached bits went bouncing down the street. The impact, noise, and G forces astounded me.
Once such an incident unfolds, you are helpless to influence your own survival - you're in the hands of the engineers and it's over in a fraction of a second.
Only the passenger-side door could be pried open to pull me out, and afterwards it overlapped the frame by several inches. I was a little disoriented, but I walked away from this accident and slept in my own bed that night. I had a bloody nose because the center of the steering wheel was propelled into my face by the air bag, a broken finger because my hand flew forward and broke the windshield, and lots of bruises where the belt/harness mashed my guts. Also, the air bag inflates at several hundred MPH, and it cut the insides of my forearms a little as it zoomed past. Not bad, considering the carnage that was wreaked upon both vehicles.
Had I been driving the Corvette that preceded this truck, or the restored classic that I was considering, or the Honda Valkyrie that was in the garage, I would have been taco filling.
I was so impressed by the survival advantages of that vehicle that I went straight to the dealer and bought another. I may continue to take calculated risks with sports cars, hot rods, and motorcycles, but if I ever have a family MOST of their daily exposure will be mitigated by a couple tons of crumple zone.