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.

There are so many sensors and computing power on a truck, you’d think the tractor would be the focus of a cyberattack, but ...

On average, a semi-truck and fully loaded trailer weighs around 50,000 pounds ... isn't particularly problematic, and using your brakes to slow your descent can help control your speed.