If a school bus stops on a highway with traffic traveling in both directions and there is a 10 foot median dividing the highway who must stop for the bus?

If a school bus stops on a highway with traffic traveling in both directions and there is a 10 foot median dividing the highway who must stop for the bus?
It really depends on what State this scenario takes place. Better to play it safe than sorry, though I'd think that in this scenario that opposing traffic does not have to stop.