'2 reasons why it's used:<br>Because it's safer," and because it's safer'<br>Seriously go to <a href=""https://www.youtube.com/watch?v=fa28lIGuxq8&amp;t=0m52s"">0:52</a> and see that he says this.",(reply>), SOUND (NOISE) AND SAFETY YOU NOOB. learn english before you make stupid comments fool,(reply>)," O:52 and <a href=""https://www.youtube.com/watch?v=fa28lIGuxq8&amp;t=1m06s"">1:06</a>",(reply>), You got the joke, 3 years ago!,(reply>), @K B have you come across trucks with this feature? We don't have them in Australia, so I've never experienced it.,(reply>), I think it's also because humans can locate the direction of white noise more easily than the beeps.