We've all found ourselves stuck behind a slow-moving semi-truck before, either in tight city traffic or on the highway. Every time it happens, we're left staring at the massive trailer in front of us, ...

If you've driven behind certain semi-trucks on the highway, you might've noticed that the rear door of the truck's trailer has a distinctive, diamond-shaped pattern covering it. This pattern resembles ...

If you've ever driven behind a semi-truck on the highway, you've probably noticed the huge, wing-like panels or flaps that extend behind the trailer doors. If you didn't know any better, it would seem ...