there seem to be a growing number of fit riders on road bikes overtaking and undertaking really and I mean really close. Is it some kind of new craze as in "you're in my way and I'm much faster than you so i'm not moving much out of the way to get past you and if I can undertake and pretend you're not there then I will"? Get them undertaking whilst I'm overtaking a stationary bus, or a bus overtaking me and they squeeze in the gap - which often is tiny anyway. One did it to me again this morning and then proceeded to carve up riders further up the road. Do they just enjoy dodging and swerving past people to see how close they can get before eventually the rider they're cutting up has to move out for a drain and there's an accident. Is it fun for them to do this?