Highway cost model : application to the Dar es Salaam - Morogoro section of the Tanzania - Zambia highway

By specifying different and demand responsive maintenance policies, it was possible to compute, using the HCM, the maintenance expenditure that would be required to maintain the existing new roads such that their Present Servicability Index never fell below a specified minimum. By analyzing the yearly report on pavement condition, as computed by the HCM, it was possible to analyze the deterioration characteristics of the SRI pavement proposal under the heaviest traffic case and moderate maintenance policy that included no overlays. In feasibility level experiment with the HCM, it was show that the model could be used to evaluate simultaneously a large number of alternatives in terms of different pavement designs and maintenance policies. Finally, with the help of the HCM, it was possible to examine the effects of traffic overloading on pavement deterioration and to evaluate post-construction investment strategies in terms of different maintenance policies for the newly constructed road.