Originally Posted by
J.C. Koto
It's possible to miss a subtle return courtesy such as a nod or finger wave if you don't know what to look for.
This.
I like to be friendly to -- or at least acknowledge -- other riders, but I'm not going to sit up and take a hand off the bars to give a full wave. Just a nod or finger wave, maybe with a "hey" if we're not too far apart.