Ted, think there's a reason why this solid vehicle has a door for each passenger.
However, I don't think a tour in Glacier National Park wouldn't be exiting, so that bored passengers can get off at will. I suppose the opposite: breathtaking views along the route that can be photographed on demand by camera-holding passengers without any sight obstructing limitations.

Yeah, we did not utilize one of these, our Jeep affording us much more freedom, but it is fun considering a propane-fueled bus in the mountains. The most fun I had with one was when we were out on the southern end of the Highline Trail, just north of Logan Pass. The trail is cut into the west and north face of Big Drift, and at that point the slim trail provides a view of the Going-To-The-Sun Highway, approximately 200 feet below. The tops of the red busses roll back, and one we saw from that trail showed us about a dozen faces looking back up at us.

-nik

It sure is colorful! I would prefer to do my own thing! :) tigs=^..^=

Still a great shot Ted:)