I had an experience like this a while back. This took place in the city though. I was driving next to this pickup truck, that was carrying a bunch of wood scraps and other debris. the truck was in a car ahead of me in the lane to my right. When the light turned green, the guy hit the gas, and his load came flying out the back. The tailgate was down. It made a huge mess on the street. Luckily no one was too close behind him.