right, then that's not right. Pic shows open lanes on the right. That's a big problem with traffic these days, people aren't active drivers. When you're on the phone, you may not realize you should be two lanes to the right, or that there is someone behind you and you are breaking the law by not moving to the right to let them by.
But we'll give Z the benefit of the doubt and assume that he moved right and you passed him on the left, and all is well in the universe