This paper presents the development and implementation of a Multi-Objective DecisionAid Tool (MODAT) tested with data from the Estradas de Portugal’s Pavement Management System. The MODAT uses a multi-objective deterministic section-linked optimisation model with three different possible objectives: minimisation of agency costs; minimisation of user costs; and maximisation of the residual value of pavements. The MODAT also uses the deterministic pavement performance model used in the AASHTO flexible pavement design method that allows the gap between project and network management to be closed. The application of the new Decision-Aid Tool is illustrated with a case study involving part of the main road network of Portugal. The “Knee point”, which represents the most interesting solution of the Pareto frontier, corresponds to an agency costs weight value of 4%, a user costs weight value of 95% and a weight value of 1% for the residual value of pavements, demonstrating that user costs, which are generally much greater than agency costs and the residual value of pavements, dominate the decision-making process.

multiple objective analysis; optimisation models; decision support systems; highway maintenance; pavement management