Originally Posted by sherp


Not really seeing any differences in seat back heights of buses versus passenger vehicles in those images and tend to guess if a seat back fails due to impact then seat belts are going to have minimal effect on the outcome as well.


School bus seats are much more confining than most passenger cars as well as more solidly constructed. More importantly, a bus, because of its greater mass, will rarely decelerate (stop) as quickly as a passenger car which means the contents (passengers) will not have as much disparity in momentum.

Sometimes, the air you 'let in'matters less than the air you 'let out'.