i will sometimes pass on the right in that situation, but can be a bit sketchy from a safety standpoint. (not sure about the legality...i doubt it is legal around here, though.) sometimes the driver of the car waiting to go straight has an epiphany at some point and realizes he can pass on the right, too. and then he just swings out to the right without looking to see if anyone is passing him on the right. if you are beside him at that "aha!" moment... so i only do it if there is a lot of room, and i can get by quickly...and i'm in a hurry for some reason.