No person shall operate on a public road a motor vehicle—
||unless an efficient exhaust silencer or muffling device is affixed thereto in such a manner that the exhaust gas from the engine is projected through such silencer or muffling device, which shall be so constructed as to reduce and muffle in an effective manner the sound produced by such exhaust;
||if any mechanism or device is attached thereto enabling the exhaust gas from the engine of such motor vehicle to be projected otherwise than through the silencer or muffling device referred to in paragraph (a);
||if the exhaust gas or smoke from the engine is so dense as to cause a nuisance to, or obstruct the vision of other road users;
||if the exhaust pipe or silencer thereof is in such a position that oil or other flammable liquid or material can drip or fall onto it, or is not in efficient working order, or is so placed and maintained that exhaust gas or smoke leaks into the driving cab or passenger compartment of the vehicle; and
||which, when tested, exceeds the limits prescribed in code of practice SABS 0181 'The Measurement of Noise Emitted by Road Vehicles when Stationary'.