One thing: A schoolbus will never move into opposing traffic to pass you. They just won't do it and the police will not respond to your protestations regardless of rule of law. They regard their cargo as more important than just about anything else. This is why they stop at RR crossings and why they stop both lanes of traffic even if they are picking up on only one side of the street. Kids are precious and a bus driver will never cross the median for any reason at all. And, even as a cyclist, I think this is correct. I'd time your route so you don't cross paths or you cross paths at a location convenient for everyone involved.