The implementation of ten-year Term Network Maintenance Contracts (TNC) in Western Australia in 1999 has required Main Roads Western Australia to manage road condition data in a highly structured manner. This paper discusses the changes in surfacing and pavement condition over the first nine years of these contracts, as well as the difficulties experienced in interpreting the data and using it to manage the contracts. It will also show that the contractors are getting more life out of surfacings than was expected. Main Roads awarded eight Term Network Contracts, six of which were purely performance based and two schedule of rates. Graphs of seal ages and pavement ages through the years will be presented and discussed. Graphs of condition data, such as roughness, rutting and strength through the years will also be shown and discussed, as well as the accuracy and interpretation thereof. The paper concludes with lessons learned. (a)
Abstract