The general speed limit is covered by reg 292. The vehicles listed in reg 293 may not exceed the speed limit in reg 293 even if the general speed limit is higher
Sec 59. Speed limit
(1) The general speed limit in respect of—
(a) every public road or section thereof, other than a freeway, situated within an urban area;
(b) every public road or section thereof, other than a freeway, situated outside an urban area; and
(c) every freeway,
shall be as prescribed.
(2) An appropriate road traffic sign may be displayed on any public road in accordance with section 57, indicating a speed limit other than the general speed limit which applies in respect of that road in terms of subsection (1): Provided that such other speed limit shall not be higher than the speed limit prescribed in terms of subsection (1) (c).
(3) The Minister may, after a decision has been taken in the Shareholders Committee, in respect of any particular class of vehicle prescribe a speed limit which is lower or higher than the general speed limit prescribed in terms of subsection (1) (b) or (c): Provided that the speed limit so prescribed shall not replace a lower speed limit indicated in terms of subsection (2) by an appropriate road traffic sign.
(4) No person shall drive a vehicle on a public road at a speed in excess of—
(a) the general speed limit which in terms of subsection (1) applies in respect of that road;
(b) the speed limit indicated in terms of subsection (2) by an appropriate road traffic sign in respect of that road; or
(c) the speed limit prescribed by the Minister under subsection (3) in respect of the class of vehicle concerned.
Reg 292. General speed limits
A general speed limit of—
(a) 60 kilometres per hour shall apply in respect of every public road or section thereof, situated within an urban area;
(b) 100 kilometres per hour shall apply in respect of every public road or section thereof, other than a freeway, situated outside an urban area; and
(c) 120 kilometres per hour shall apply in respect of every freeway.
Reg 293. Speed limit for particular class of vehicle
(1) In terms of section 59 (3) of the Act, a speed limit of—
(a) 80 kilometres per hour shall, subject to the proviso to the said section, apply in respect to—
(i) a goods vehicle the gross vehicle mass of which exceeds 9 000 kilograms;
(ii) 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;
(iii) an articulated motor vehicle, of which the gross combination mass of the truck-tractor exceeds 9 000 kilograms; or
(iv) any breakdown vehicle that is towing another vehicle;
(b) 100 kilometres per hour shall, subject to the proviso to the said section, apply in respect of-
(i) a bus;
(ii) a minibus or a midibus operating in terms of an operating licence;
(iii) a rapid transport bus and a rapid transport bus-train; and
(iv) (aa) a goods vehicle the gross vehicle mass of which exceeds 3 500 kilograms but does not exceed 9 000 kilograms; or
(bb) 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 3 500 kilograms but does not exceed 9 000 kilograms.
(2) (a) There shall be displayed on the rear of a goods vehicle contemplated in subregulation (1)(a), a sign denoting that such goods vehicle is subject to a speed limit of 80 kilometres per hour, and such sign shall comply with the requirements of SANS 1329 “Retro-reflective and Fluorescent Warning Signs for Road Vehicles”, Part 3: Signs other than triangles, chevron signs and abnormal load vehicle signs, with respect to the colours displayed on such sign.
(b) There shall be displayed on the rear of a motor vehicle referred to in subregulation (1)(b) a sign denoting that such vehicle is subject to a speed limit of 100 kilometres per hour, and such sign shall comply with the requirements of the standard specification referred to in paragraph (a) with respect to the colours displayed on such sign.
(3) Notwithstanding any provision in these regulations, for the purposes of this regulation, the term goods vehicle shall not include a haulage tractor.
Regards
Alta