I haven’t seen any “Official” dictionary of gestures motorcyclists use. There is of course the standard wave as discussed in “Why we wave” thread, but not much on the other signs we throw each other…
So I thought we could get them worked out here. Things like:
Flagging a rider behind you to pass.
Wanting to Change lanes.
Calling out a Hazard on road.
Signaling that a Cop is ahead.
Calling someone a squid that derives all the pain from cleaning the road rash they are about to get.
And so on….