National Road Traffic Act, 1996
Chapter IX : Road traffic signs and general speed limit
58. Failure to obey road traffic sign prohibited
1) Subject to subsection (3), no person shall, unless otherwise directed by a traffic officer, fail to comply with any direction conveyed by a road traffic sign displayed in the prescribed manner.
2) In any prosecution for a contravention of or a failure to comply with a provision of subsection (1), it shall be presumed, in the absence of evidence to the contrary, that the road traffic sign concerned was displayed by the proper authority under the power conferred by this Act and in accordance with its provisions.
3) The driver of a fire-fighting vehicle, a rescue vehicle or an ambulance who drive such vehicle in the performance of his or her duties, a traffic officer who drives a vehicle in the carrying out of his or her duties or any person driving a vehicle while engaged in civil protection as contemplated in any ordinance made in terms of section 3 of the Civil Protection Act, 1977 (Act No. 67 of 1977), may disregard the directions of a road traffic sign which is displayed in the prescribed manner: Provided that –
a) he or she shall drive the vehicle concerned with due regard to the safety of other traffic; and
b) in the case of any such fire-fighting vehicle, rescue vehicle, ambulance or vehicle driven by a person while he or she is so engaged in civil protection, such vehicle shall be fitted with a device capable of emitting a prescribed sound and with an identification lamp, as prescribed, and such device shall be so sounded and such lamp shall be in operation while the vehicle is driven in disregard of the road traffic sign.