It happens to me with cars, why not with motorcycles? I don't remember it happening to me with a motorcycle, and I don;t think it happens too often to me with cars, but then, I may be used to it by now.

I've been riding with a take-a-look mirror for decades and when I see a vehicle gaining on me from behind and there is an open lane next to me on the left, I wave them off to the side with my left arm. It seems to work most of the time, but not always.