I'm conflicted about this one. I never see cyclists on the road so that's not an issue, but what to do on the MUPs? My problem is that I want to be friendly but I also do *not* want bicycling to be like driving a VW Beetle or a motorcycle where there are goofballs who feel like they must wave or honk at other people driving the same vehicle that they are. OMG! YOU BOUGHT A MOTORCYCLE TOO?!?! *WAVE* I bloody hate that non-sense.
I've found a quick head nod suffices.