[Dorgnarg]

I think some universal hand signals would be a great way for teams to collaborate! (Something à la Noodle Agreement except not a loophole that can be plugged).
My first thought was to use basic ASL (I've been trying to learn it lately haha so it's kinda on the front of my mind) or if people didn't want to learn actualy ASL we could just use letters for signs (eg. 'f' for forward, 'b' for backwards, 's' for stop) since most of them are different enough that they can probably be differentiated from a decent distance.
Semaphore would be an awesome choice too especially since it was made to be seen from a distance, but I will say that hand signals might be easier for the spy just because sudden changes (best example I can think of is if a robot suddenly tries to run into/block/etc you) might take longer to communicate with full-body signals than with hand signals.
It would be cool to turn the final decision into a document or something that we could print out and have at the driver stations and stuff as a just-in-case reference