Correct answer
Tractor unit
A tractor unit. The statutory definition concerns towing a semi-trailer, not every vehicle towing a full trailer. This definition does not require a particular engine displacement or axle count. Coupled to the semi-trailer, it forms an articulated vehicle.
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Truck derivative
Tractor unit
Container-carrying vehicle
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Glossary terms in this question
Semi-trailer
Trailer without a front axle, coupled to a tractor unit so part of its weight rests on the tractor.
Articulated vehicle
Motor vehicle coupled to a semi-trailer; in traffic law it counts as a combination of vehicles.
Tractor unit
Motor vehicle built mainly to haul a semi-trailer; coupled to one it forms an articulated vehicle.
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