I've thought about what I would do in this situation many times. I still have no idea.
This driver probably skidded on the icy bridge deck to end up dangling over the guardrail. You can see this as a good samaritan jumps out of a passing vehicle and loses his footing.
It takes a few minutes but after applying weight to the back of the truck and having some people grab on, he makes his way out. Frankly, I'd be scared that the weight of the doors moving forward might make it go over the edge. But somehow he made it out of the truck!
Photo credit: Stephen Maturen Getty Images News