How does a car detect it is in a collision to activate the airbags?

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How does a car detect it is in a collision to activate the airbags?

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Older cars used pressure pads behind the bumpers. Newer cars use g-force sensor chips mounted in the cab to detect force, angle, and extreme changes in speed and direction.

There are accelerometer sensors in the frame/body of the vehicle. These accelerometers triggers the airbags when they detect an acceleration due to impact that is above a certain threshold.