If you've ever been stuck behind a slow-moving semi-truck with nothing to do, you may find yourself wondering what the little door on the trailer is for.

Severe weather and dangerous driving conditions affected many Iowa truck deliveries on Wednesday, including those by Fareway.

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 ...