OK, here is my *very* unofficial poll of who responded to my wave or nod.
I did a 15 mile ride on one of my regular loops (Lowell Rd.- Monument St., back by the North Bridge). This is an extremely popular route for cyclists from all over eastern MA, commuters, clubs, etc. Since I went out at 9 AM, on a weekday, I guess the participants in my poll are not well distributed.
I observed for about 13 miles, basically the loop part of the ride. I either waved very slightly, not a vigorous, obnoxious thing, or nodded my head once. All of the men either waved back or nodded. None of the women waved, but one did smile at me. All of these riders were on road bikes, although it is not unusual to see plenty of people on hybrids or mountain/comfort bikes on this route.
Maybe because I was wearing my black and yellow helmet with my red shoes and bike ?
OK, gotta go do my work.