(a) is not emitting dark smoke, he or she must furnish the driver of the vehicle with a certificate indicating that the vehicle is not being driven or used in contravention of section 21; or
asikhuphi umsi omnyama, kufuneka anike umqhubi wesithuthi isiqinisekiso esichaza ukuba isithuthi eso asiqhutywa okanye asisetyenziswa ngokuchasene necandelo lama-21; okanye