What is the automobile designed mainly to tow a semi-trailer called?

Question

DentroTest · Accepted Answer

The tractor unit (the tractor head) is, according to Annex II of the General Vehicle Regulations, the automobile designed and built mainly to tow a semi-trailer. Coupled to its semi-trailer, it forms an articulated vehicle. The container carrier is not a tractor unit: it is a vehicle built to carry containers with securing devices. The truck-derived vehicle is not either: it is a version of the truck equipped to carry people, up to a maximum of nine including the driver.

What is the automobile designed mainly to tow a semi-trailer called?

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