Height restrictions....practical ones....
Two stories (key word being "story".)
I was driving to work one morning and had to stop because an old, beat up pick up truck stopped in the road blocking a low clearance bridge. The truck was piled high with household possessions that stuck up a good 14 or 15 feet in the air. It looked like these folks emptied out their entire mobile home into the back of the pickup truck. I got out and walked up to the driver's door.
"The clearance on this bridge is only 10' 6"", I said.
The driver looked at me and said, "Yeah, I know, but there aren't any cops around, so I was thinking about running it."
On the way home from work one day I came across a truck that had tried to pass that same low clearance bridge and had gotten itself wedged completely immobile. I got out and was looking at the situation when a county cop pulled up. He got out and came up to the driver and said, "Stuck, huh?" The driver said, "No, sir, I was just hauling this bridge when I ran out of gas."
How tall is everyone's bus anyway? Going down the road they look to me to be about 10 tall, but I don't know how close that estimate is. If the tires are 40" in diameter (24 inch wheels), and there is 6" of tire up in the bus in the wheel wells, and there is another 6 and a half feet from the floor to the ceiling, you'd be pushing 9 and a half feet, ground to roof.