All this runaway truck talk brings to mind a couple of songs:
"Nitro Express" what's got, "I had to ride 'er down, I couldn't jump free or there'd be a big hole where that little town used to be."
and
"Wolf Crick Pass" (C.W. McCall...yes, I'm a nerd) which contains the eloquent lyrics "The sign said clearance to the twelve foot line, but the chickens was stacked to thirteen-nine. We shot that tunnel at a hundred and ten, like gas through a funnel and eggs through a hen. We took that top row of chickens off cleaner than scum off a Louisiana swamp!"
I don't care how off topic it is, you can't beat a good runaway truck song!
Clem