"A semi-tractor-trailer truck, also known as simply a semi-trailer truck, semi-tractor truck, semi-tractor-trailer or tractor-trailer truck, is the combination of a tractor unit and one or ...
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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 transport truck, semi-truck, trailer truck, tractor truck, transfer truck, articulated truck, articulated lorry (UK), artic, single truck, semi-trailer, tractor-trailer, semi-tractor, semi, trailer, tractor, big rig, eighteen-wheeler, juggernaut, depending on the country and region." - (en.wikipedia.org 07.11.2021)