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In a vehicle combination consisting of a heavy tractor unit and a semi-trailer intended for road transport of goods:
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AThe 'fifth wheel' or coupling plate has the function of joining the tractor unit to the semi-trailer;
BThe 'fifth wheel' or coupling plate has the function of securing a damaged or simply punctured wheel;
CThe 'fifth wheel' has the function of assisting the sixth wheel in supporting the front part of the semi-trailer on the ground when parking.