Now, first, you have to realize that the truck is facing the wrong way. Look at it.: it's facing towards where it first crashed.
The truck must have hit a barrier or two, launched itself off of a guard rail, jumped! Jumped a massive storm drain! And either spun or tipped or both, in such a way that it was facing the other way. Somehow it wound up sitting on a ridge, and not at the bottom of whatever that ridge sits on top of...
Which is...
