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Safety Devices Seat belts During a traffic crash, at the moment of impact, people in the car are still traveling at the car's original speed. Just after the car rapidly comes to a stop, the people not wearing seat belts slam into the steering wheel, windshield, or other parts of the car's interior, or are ejected from the car. Seat belts are very effective in reducing deaths and injuries caused in this second collision. The …

…engine are designed to crumple and slide underneath the passenger's compartment. In combination with the crumple zones, the passenger compartment is often built using high tensile steel, which creates a rigid passenger cell often referred to as a "safety cage." This is also supported by new side-impact beams, which are found within car doors. Crumple zone is very effective way of absorbing the force before its impact passes straight inside the vehicles onto the passengers.