2019, never heard anything but beeping,(reply>), unless you were actually looking out for the sound you wouldnt register it as that. On the other hand the reverse beeping has existed for a while so we tend to know what that is. <br><br>I've heard both, and also the "caution vehicle approaching",(reply>), yanks cant afford to replace their old stock. That country is f@@ked,(reply>), ^ Debatable, and selling the human brain a bit short.,(reply>), You probably have heard it and your brain just isn't able to remember it at a moment's notice.