What is the primary function of a tractor unit?

En español: ¿Cuál es la función principal de una cabeza tractora?

What is the primary function of a tractor unit?
A Transport goods directly on its own platform
B Haul semi-trailers; key to freight and logistics Correct answer
C Provide emergency and towing service on the road
D Travel at higher speeds than a conventional lorry

Why this is the correct answer

The tractor unit is designed to haul semi-trailers, making it key to freight transport and logistics.

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