Crumple zones work by managing the crash energy so that it is absorbed within the frontal section of the vehicle, and by preventing intrusion into or deformation of the passenger cabin. This acts to ensure front seat occupants are properly protected against injury. In simplistic terms, this is done by strengthening the passenger cabin part of the body by using more reinforced beams and increasingly, higher strength steels.
A common misconception about crumple zones is that they reduce safety by allowing the vehicle's body to collapse, crushing the occupants. The marked improvement over the past two decades in high speed crash test results proves this is a misconception. Modern vehicles using what are commonly termed 'crumple zones' provide, on average, far superior protection for their occupants in severe tests than older models.
The only other general downside to crumple zones is that repair costs are higher in "fender bender" accidents.
A crash test illustrates how a crumple zone absorbs energy from a crash.
The 2004 Pininfarina Nido Experimental Safety Vehicle locates crumple zones inside the Survival Cell. Those interior crumple zones decelerate a sled-mounted survival cell.
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