In the US about 5 years ago Trucking Co's were putting these Rev Beeps on their Over the Road Trucks . This was a major problem as when backing at all hours of the day and night into a space in the truck stop the "Beeping" was like an Alarm Clock waking other drivers up that needed their sleep. Believe it or not a truck could pull out and another could back in and you would never be woken up. BUT that  "BEEP,BEEP,BEEP would always wake you.