Not going to click on that link, sounds abstruse
I'll just give you the highlights. It's about waving.
"It is no longer assumed that two cyclists have something in common. Even their love of cycling is not necessarily a common cause."
Nicely written I thought, though personally I'm not really with him at the end.
Just got back from a ride where it happened. Very serious-looking guy approaching, and there aren't a lot of cyclists around here, so you almost seem to be making some kind of point if you don't smile or say hi (not that I think cyclists should be under any firm obligation to, any more than, say, segway riders).
We get closer… closer… then it's crunch time: turn the head slightly and do the deed? I do. He doesn't. We carry on our separate ways, but I'll remember that pink jersey. Oh yes.