Paper presented at the 29th Annual Southern African Transport Conference 16 - 19 August 2010 "Walk Together", CSIR International Convention Centre, Pretoria, South Africa. ABSTRACT:
Correct version of paper uploaded from the SATC website at : http://www.up.ac.za/academic/civil/satc 2010. The material was published using Adobe Acrobat 8.0 Technology.
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