19. The maximum total loaded mass of a road vehicle or combination of road vehicles shall be the lesser of:(1) the total loaded mass computed by adding the approved maximum axle loads in subparagraphs 1, 2 or 3 of the first paragraph of section 13 for each class of axles of that road vehicle without exceeding, for class B.1, 5,500 kg in the case of a tractor and 7,250 kg in the case of the other vehicles, for class B.3, 13,000 kg and for class B.2, 14,000 kg;
(2) the total loaded mass prescribed by section 20.