Studies have shown that debris on the road has become a major problem. Mattresses are one of the main things that fall out of the beds of trucks but there are many other hazards as well. 155 people were killed in California alone in the last 24 months by debris falling off of people's cars and trucks. So when you are attempting to move things yourself, make sure you tie your load down. And when you think you have it tied down, tie it down some more.