National Road Traffic Act, 1996 (Act No. 93 of 1996)
National Road Traffic Regulations, 2000
Chapter VI : Fitness of Vehicles
Part II : Equipment on or in respect of vehicles
219. Axle or axle unit to be fitted to semi-trailer
A semi-trailer first registered on or after 1 July 1999, shall be fitted with only one axle or one axle unit, which axle unit shall be fitted with suspension of one type only namely either air suspension, steel suspension, or rubber suspension.