Semi-trailer truck
Combination of a tractor unit and one or more semi-trailers to carry freight / From Wikipedia, the free encyclopedia
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"Big rig", "Eighteen wheeler", and "Truck and trailer" redirect here. For use of the expression in rugby union, see Glossary of rugby union terms § T. For other uses, see 18 wheeler (disambiguation) and Big Rig (disambiguation).
A semi-trailer truck,[1] (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.