Brake lights are not only about showing deceleration, but also intention.
If I tap the brake and it doesn't really change my speed, it still signals to those behind that I was (for whatever reason) think about slowing down, which is useful information.
So I think brake lights should come on when deceleration is greater than a certain value, OR when the brake pedal is pushed.
If I tap the brake and it doesn't really change my speed, it still signals to those behind that I was (for whatever reason) think about slowing down, which is useful information.
So I think brake lights should come on when deceleration is greater than a certain value, OR when the brake pedal is pushed.