In a crash, a car’s crumple zone is designed to absorb energy and deform to protect the passenger compartment.
Crumple zones are deliberately engineered sections at the front and rear of a vehicle. They fold, crush, or buckle in a controlled way during a collision, converting some kinetic energy into deformation rather than transmitting it directly to occupants. They also lengthen the time over which the car and its passengers slow down, reducing peak force.
The passenger compartment is treated differently: it forms a strong safety cell intended to resist intrusion. This is why visible damage to the hood or trunk does not necessarily mean the cabin has failed. A common mix-up is to credit the airbag or seatbelt with absorbing the car’s crash energy; those systems protect and restrain people, while the crumple zone primarily manages the vehicle’s structural energy.
Austrian engineer Béla Barényi patented the modern three-part body concept in 1937, and Mercedes-Benz developed it into production vehicles during the 1950s. Modern designs combine crumple structures with seatbelts, pretensioners, airbags, and rigid occupant cells.