My husband and I just spent a few days in Gettysburg. On the way home today we were passed on the freeway near Pittsburgh by a SUV going about 80 mph with a mattress strapped to the top with two little straps around its middle. The straps were loose and the mattress was catching big wind. I was scared it was going to fly off at any moment. The pressure of the wind at 80 mph, like holding up a sheet of plywood against a hurricane!! You'd think they'd see the horrified look of people in other cars that they would check to see what was happening. Luckily we stopped at a rest stop and didn't have to follow behind it. A normal brain message would tell you to tie at least one rope front to back.