In this paper we focus on the road network design problem in regional contexts. In this case a plannermay have financial resources to invest for improving performance on existing roads. Against thebackground of an extensive literature of optimisation models and algorithms to solve this problem, theinnovative aspects of this paper are as follows: the optimisation model refers to the daily operation of thenetwork; the objective function also considers the environmental costs; the proposed meta-heuristicsolution algorithm has never been used to solve this problem; and the assignment algorithm is based onAnt Colony Optimisation in order to reduce computing times. The model and algorithm were tested on areal-scale problem, showing their applicability to real dimension networks.
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