I've had a few people not know I was behind them, but they're usually distracted by the phone/music/kids etc (or were just being completely ignorant). I know it definitely makes a noise because my mate has commented a few times when I've dropped her off at night. Personal thought is that the sound EVs make (when they've not been disabled) is unusual, and not what we've got used to over the years. We know what a "regular" car sounds like. Many of us will have to learn the new sounds... others could do with reading the pedestrian section of the Highway Code ?