In the case of a semi-trailer, a centre-axle trailer and a rigid drawbar trailer, the maximum mass to be considered for classifying the vehicle shall correspond to the maximum mass transmitted to the ground by the wheels of an axle or group of axles when coupled to the towing vehicle.
I gcás leathleantóra, leantóir acastóra láir agus leantóir barra tarraingthe dhocht, beidh an uasmhais a gcinnfear catagóiriú na feithicle ar a bonn ag freagairt don uasmhais a thras-seolann rothaí acastóra nó grúpa acastóirí chun na talún nuair atá siad ceangailte den fheithicil tarraingthe.