Correct answer
A motor vehicle made up of a motor vehicle hitched to a trailer
A road train consists of a motor vehicle hitched to a full trailer. It differs from an articulated vehicle, which has a semi-trailer, and a tractor unit, designed mainly to tow a semi-trailer. This definition does not by itself establish a general heavy category by adding the component MAMs: permissible combination masses and applicable rules must be checked for the specific configuration and its documents.
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A motor vehicle made up of a motor vehicle coupled to 1 semi-trailer.
A motor vehicle made up of a motor vehicle hitched to a trailer
A motor vehicle designed and built mainly to tow a trailer or semi-trailer.
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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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