27. Up to 31 December 1994, the maximum loads prescribed by section 14 for axles of a road vehicle of a model year prior to 1992 shall be increased to 17,500 kg for axles of classes B.2 and B.3, to 22,000 kg for those of class B.51, to 25,000 kg for those of classes B.37 and B.52, to 27,000 kg for those of classes B.38 and B.53 and to 29,000 kg for those of class B.54.