Video encyclopedia

Semi-trailer truck

Road vehicles

A semi-trailer truck 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 fifth wheel coupling (hitch), with much of its weight borne by the tractor. The result is that both the tractor and semi-trailer will have a distinctly different design than a rigid truck and trailer.


  • Regional configurations 

  • Construction 

  • Semi-truck manufacturers 

  • Role in trade 

  • Media