I recall seeing a video of a 60's era vehicle ("those cars were made stout") compared to a current model. The passenger compartment of the older vehicle was basically compressed to nothing versus being completely intact on the modern vehicle. Both vehicles were totaled, but the driver of the new car would have survived, thanks to the energy absorbing features engineered in.
I plan on putting seat belts in my truck, but know it's mainly to comply with state laws about wearing seatbelts.
