I've never visted that particular range before, but I did have a spectacular encounter when I was 5 with those magnificant animals just inside Yellowstone.

The road you describes sounds like my kind of road!

And If I may, my interpretation of what those Bison are thinking: "And on your left, you'll notice a human. He is in his protective shell called an auto. It makes lots of noise, smells, and can be dangerous. This species requires these protective shells out in the wild, because they have no natual defenses. And, from what my great-great-great grandpa said, they make an increadible squish when hit by our heads when out of their protective shells."