24. (1) The gross mass of a vehicle shall not exceed—
(a) the manufacturer's gross vehicle mass;
(b) the aggregate of the maximum mass permitted by section 25 to be carried by several wheels of the vehicle; or
(c) the mass determined in relation to the class of vehicles to which the vehicle belongs;
whichever is least.
(2) The aggregate of the gross masses of a motor vehicle and a trailer or semi-trailer coupled to it shall not exceed—
(a) the manufacturer's gross combination mass of the motor vehicle and the trailer or semi-trailer;
(b) the aggregate of the maximum amounts of mass permitted by section 25 to be carried by the several wheels of the motor vehicle and the trailer or semi-trailer; or
(c) the mass determined in relation to the class of combination of vehicles to which the motor vehicle and the trailer or semi-trailer belong;
whichever is least.