This subject came up a while back. There was no clear answer. Since then (as a passenger, can't drive) I have studied this conundrum and my conclusion is there is no right of way, it is just a figment of your imagination.
Ceres buses always seem to have no problems, their operating motto is funerals are cheaper than hospital treatment lol.
Yeah, my wife tells me that, but then shouts at me when I get there two inches in front of the other guy.