The signal with right arm extended for a right turn has ben in the UVC for over several decades. I have found it in the vehicle code or laws that govern the use in all states that I have lived in. I was confronted by an indigent deputy in Florida and told to do it the car way. He showed me his cheat sheet and the part which says a bicyclist may extend the right arm out was was missing from it. It took his supervisor and nearly an hour and a half for him to shut up and let me and my 10 year old son leave the seen of the crime.