An aside – if you get in a crash involving a semi truck and you aren’t inside, you are dead. It doesn’t matter how crumply the truck is. It is so massive that it isn’t going to stop.
The purpose of the crumple zones are to slowly absorb the energy of a crash so that the passengers slow down over a greater amount of time. When dealing with a semi, the semi has such a large mass that there is no chance of slowing it down. If you crash into it, you might as well be crashing into a wall.
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