Above the rear tyre on the side of the bus away from oncoming traffic.
Being someone who always over thinks things I used to sit there for my school commute. So I was less than impressed when the bus dropped that wheel off a cliff on a windy road.
Managed to drag back onto the road at least so I didn't get to test the survivability of my seating arrangement in free fall.
I thought we just needed a good guy with a volcano.