Semi-trailer truck

A semi-trailer truck, (also known by a wide variety of other terms - see below) is the combination of a tractor unit and one or more semi-trailers to carry freight. A semi-trailer attaches to the tractor with a type of hitch called a fifth wheel.

"Big rig", "Eighteen wheeler", and "Truck and trailer" redirect here. For use of the expression in rugby union, see Glossary of rugby union terms ยง T. For other uses, see 18 wheeler (disambiguation) and Big Rig (disambiguation).

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