LOL, we stayed quiet, though I rolled down my window for a clearer video as he meandered on by. I'd say he was 4-6 feet from my car. Of course, it was huge.
My then 6YO grandson only moments before, called out from the back, "I'm bored!!!" Shortly after the bison moved past us, I heard him say, "Opa, I'm not bored anymore." lol
LOL. We had that experience with bison. And bears. We never got out our vehicle on those occasions so it wasn’t an issue.
Just be prepared to drive slowly and carefully.
And be prepared to wait if necessary.
The other thing is that the two times I visited with family, both quite a while ago, there seemed to be mounted park rangers most places people congregated.
I’m betting the park could use more mounted park rangers.
“Opa”.. is that like Oompa?