This is odd... I work in and around various building sites in the North-East and Cumbria 5-7 days a week. I have never heard a white noise reversing signal, although I have heard white noise mixed in with emergency vehicle two-tone sounds.,(reply>), I <b>wish</b> all the delivery trucks for the supermarket below our offices and the garbage collector trucks had white noise reversing alarms. The high pitch beeping, which isn't even adequately stopped by closed windows (nevermind that closed windows are a bad idea in this warm, humid weather) is incredibly annoying and distracting.