Why do busses sway?
Why do busses sway? Weak springs (leaf or coil) or a lack of anti-sway bars can contribute to excessive sway, and on air bag-equipped chassis, it can be the very act of the air entering/exiting the bags.
Why are buses so shaky?
A school bus is most likely to be bouncy due to the air suspension working as well the axle. Charter buses are air suspension but feel like you are air riding because the seats are raise higher from the suspension and the axle. This makes the bus ride more comfortable on long rides and when going on bumpy roads.