JOLIET, Ill. (CBS) -- A semi-trailer track rolled over and shut down all but one lane on Interstate 80 in Joliet. At 5:34 p.m., the truck hauling steel flipped over on eastbound I-80 at Center Street.

Let's be honest: unless you work in the freight industry, it's easy to think of a semi-trailer as just a big cargo box on wheels. In reality, there's a whole variety of semi-trailers out there, each ...