When you press the brake pedal of a moving vehicle, the red brake lights (stop lights) at the rear of the vehicle automatically light up

When you press the brake pedal of a moving vehicle, the red brake lights (stop lights) at the rear of the vehicle automatically light up. Why is this needed?

braking signals should light up automatically so that the following vehicle sees a decrease in the speed of the vehicle in front and has time to also reduce the speed, avoiding a collision.

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