Semi-trailer truck

"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).

Conventional style cab tractor
A cab over semi-tractor
Tractor with an end-dump trailer
A FAW semi-trailer truck in China

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.

  1. ^ "semitrailer". Merriam-Webster. Retrieved 7 February 2022.