Pienaar, P.A. (Petrus); Campbell, T.G.; Pienaar, A.J.; Malele, R.; Phillips, S.D.
(SATC, 2001-07)
Paper presented at the 20th Annual South African Transport Conference 16 - 20 July 2001 "Meeting the transport challenges in Southern Africa", CSIR International Convention Centre, Pretoria, South Africa.