I assume the truck hit the guardrail and jumped across the ravine, while doing at least a 180 in the air. Wow. I've passed a few accidents and wondered how that happened. I once saw a car with a steel guardrail in one door and out the other door. The end of the guardrail protruded from one side of th car by about 20 feet. I assume the driver and any passengers were killed. Somehow, the car managed to sideswipe the end of a guardrail, pusing it througgh the car, and ripping the guardrail off from 20-30 feet of wooden supports. That car had to be going pretty fast.
Kevin