A speed limit of 80 kilometres per hour shall apply in respect to-
a goods vehicle with a GVM of more than 9000 kilograms;
a combination of motor vehicles consisting of a goods vehicle, being the drawing vehicle, and one or two trailers of which the sum of the gross vehicle mass of the goods vehicle and of the trailer or trailers exceeds 9 000 kilograms; or
an articulated motor vehicle, of which the gross combination mass of the truck- tractor exceeds 9000 kilograms;
Any breakdown vehicle that is towing another vehicle: