Passing a semi-truck on the highway, your eyes might be more drawn to the trailer on the back than the cab pulling it — especially if its plastered with pictures of snack cakes or images of fast food.

Semi trucks, though they get little recognition, or even respect, for that matter, are holding America together. These rigs, often called 18-wheelers, can last millions of miles, and are concentrated ...

The Nicolas Tractomas TR 10x10 D100 currently holds the Guinness World Record for being the largest semi truck. What about the other two on our list?

Have you ever wondered why some semi trucks have one set of wheels and others have two sets crammed together? That's because some semis use a single axle while others have tandem axles, but why is it ...