Dumbest idea <b><i>ever.</i></b><br> <br>If the <i>Powers That Be</i> think <b>noise</b> (which is literally what this is -- "white noise") stands out better in a <b>noisy</b> environment than a distinctive beep, they're idiots.   If they think a hissing sound -- which sounds exactly like a million other hissing sounds (especially at a noisy construction site!) -- like air brakes and compressed air hoses, for example -- stands out better than a shrill beep, then they're idiots.  If they think the soft “shh” of escaping air sounds more like a warning than a harsh, high-pitched beep does...that's right, they're idiots.<br> <br>Unbelievable.