I was just driving home from the grocery store and saw a huge police presence up the road and I was stuck in a huge traffic jam where there usually aren't any, except for during the evening commute times. When I finally got to pass the accident I saw that a roll off truck had hit the overpass for the interstate. The truck was totally mangled and there was a big chunk of concrete taken out of the bridge. It got me to wondering, how does stuff like that happened. Have you ever passed an accident investigation and wondered the same thing?