Agree fully with this - I have been buzzed a number of times by bikes at pretty high speed - I don't think it is malicious, just ignorance. If only I could catch up with the buggers I would have a word.Won't go into much detail but some of the worst close passes I've had have been from motorcyclists. I'm always slightly surprised that they do it but then maybe motorcyclists don't get overtaken often themselves so don't realise how unsettling it can be?