This is a 2014 video so maybe Tom should do a update on it - maybe it's just for built up areas to help cut down on noise pollution? Because to be honest we still have the lorries/trucks/vans/buses etc with the beep in 2017 in the Kent area (England). And it does sound like a normal sound you get from large vehicles and I wouldn't pay any attention to it at all. At least with the beeping it's something you recognise as dangerous.