Imagine you have a billiards ball and a ping-pong ball on the table. If you roll the ping-pong ball at the billiards ball, the billiards ball won’t move much (if at all) when the ping-pong ball hits it. Roll the billiards ball at the ping-pong ball and the billiards ball will launch the ping-pong ball across the room… or at least move it a lot!
Busses are heavier than most other things on the road. One of the big dangers of an accident is the rapid change in speed. What the bus hits isn’t gonna slow the bus down that much, which means it’s not going to slow the riders down that much or that fast.
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