The white noise ones are unknown here in the US.,(reply>), Any type of safety noise are unknown here in India.,(reply>), I heard one once,(reply>), I’ve seen a couple trucks with it and I just assumed that the beeper was broken lmao,(reply>), Prob bc they play the white noise at a lower volume.,(reply>), I'm in the UK and never seen one, they are all tones or litteral " this vehicle is reversing, bing bong"