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The seat belt helps by locking you in place so if there is a sudden stop or anything you will not get out of your seat because the seat belt will be there to stop that which will prevent you from getting injured.
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Head restraints are designed to limit the movement of the head when the car crashes that way there are little head or neck injuries.
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The bumper of the car helps protect the safety features inside the car if the car gets into a crash.
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Apdative Cruise Control is when you set your car to a certain speed and it goes straight at that set speed but it also stops when it senses it gets too close to an object.