Traffic accidents resulting in serious injury or death to bus passengers are relatively rare events.
In fact, a child is three times more likely to be killed while boarding or disembarking from a school bus than while the vehicle is moving. School buses often travel at relatively low speeds, and their height and mass provide substantial protection to bus passengers in collisions with passenger vehicles. However, the large size of coach and school buses can conversely present a substantial hazard to other motorists traveling in light weight passenger vehicles. School buses are relatively stable vehicles, but may overturn under certain conditions. When overturns occur, ejections are rare, as windows and other portals are relatively small.