Have you ever noticed a big plastic scoop underneath a semi-truck while driving down the highway? It actually serves a very ...

You've probably noticed those giant flaps mounted on the backs of many semi-trailers you see on the highway. Here's what they ...

Semi-trucks have a lot of wheels, a lot of storage space, and a lot of... lights? Obviously, some are necessary to see the ...

VIEW ALL PHOTOS. I-15 Fatal, Milepost 85, Iron County. ... Cpl. Scheer said the trailing semi-truck rear-ended the other, veered off the right shoulder of the interstate, and rolled.