Paper presented at the South African Transport Conference 17 - 20 July 2000 "Action in transport for the new millennium", CSIR International Convention Centre, Pretoria, South Africa.
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Du Toit, E.M.; Coetzee, J.L.; Oosthuizen, G.; Joynt, H.; Southern African Transport Conference (20th : 2001 : Pretoria, South Africa)(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.