The report describes the development of NETCOM, a road NETwork COndition Model, developed at the University of Birmingham under contract to the Transport Research Laboratory. NETCOM is a computer model developed for studying the effects of changes in road maintenance budget levels on the condition of a road network. NETCOM models the progression of defect distributions on a road network and predicts the network condition in future years based on specified maintenance standards and the budget profile. NETCOM is designed to assist road maintenance engineers and administrators in planning the medium to long term maintenance investment requirements for local and national road networks.

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