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Why Are Semi-Trucks Also Called Tractor Trailers?

We've probably all heard the term "tractor trailer" used when talking about massive semi-trucks. The two names get tossed around so often that they've become interchangeable, begging the question of ...
Yahoo

Semi-truck crash closes southbound I-15 lanes north of Las Vegas valley

LAS VEGAS (KLAS) — The southbound lanes on the I-15 northeast of the Las Vegas valley were closed Tuesday after a crash involving a semi-tractor trailer. According to the Nevada Department of ...