Perhaps PBOC is the oddball then. Last couple of events I did with them the rule was you had to wave by traffic on the left, which sucks since it requires you keep the window down and throw your hand out to signal, not to mention trying to be courteous to passer by's when you are coming up on a right turn. The plus side is they didn't have many restrictions on where you could pass assuming you dared so squeeze by the outside of a guy with one hand hanging out the window, lol.