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Seat belts prevent the person in the car from harm when the car hits a sudden stop, wheather it is from crash or not. The force of movement is instantly slowed by the elastic seatbelt.
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Head lights on a car display lights ahead of the vehicle, allowing the driver to have vision over what is in front of them, therefore being able to manuvear the car.
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This break uses friction to convert kinetic-energy into heat, allowing for the vehicle to react in a sudden motion, making it stop.
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Airbags are released from there slots when the vehicle hits something from the front, triggering it to become realeased and put a reactive motion of force against the person in the accident.
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When invoked it therefore enhances driver control as throttle input applied is mis-matched to road surface conditions (due to varying factors) being unable to manage applied torque.