Knowing how to couple and uncouple correctly is basic to safe operation of combination vehicles; incorrect uncoupling and coupling can be very dangerous. There are differences between different trucks and trailers, so make sure you learn the details of coupling and uncoupling the truck s and trailer s you will operate. Note: Steps 3 and 4 may be completed in either order.
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 type of hitch called a fifth-wheel. It is variously known as a semisemi-Truck or Transporter in Canada ; semi or single in Australia and New Zealand ; semitractor-trailerbig rigor eighteen-wheeler in the United States ; and articulated lorryabbreviated articin the United KingdomIreland and New Zealand. In North Americathe combination vehicles made up of a powered truck and one or more semitrailers are known as "semis", "semitrailers",  "tractor-trailers", "big rigs", "semi trucks", "eighteen-wheelers", or "semi-tractor trailers".
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