While headed to Missouri on I-24 a year or so ago, we were about a quarter-mile behind an auto carrier full of new boat trailers. A wheel and tire fell off one of the top-most trailers and that thing had to have bounced 50 feet in the air. It bounced 2 or 3 times then rolled down an embankment. We got up next to the embankment and there had been a minor accident at the on-ramp below. The cop was standing there taking information from the drivers and the rogue wheel had rolled down the embankment and stopped right next to his cruiser.