A combined AHP-PROMETHEE approach for selecting the most appropriate policy scenario to stimulate a clean vehicle fleet

The aim of this paper is to recommend a multi-instrumentality policy package to the Belgian government in its objective to reduce environmental externalities by encouraging people to make a more sustainable vehicle choice. As there are many policy instruments available (regulatory, economic, transport supply instruments), which may have several important effects referring to economic, environmental, technical and social aspects, selecting the most appropriate policy scenario is a multi-criteria decision making problem. This paper proposes an integrated approach for the decision-making problem that combines the Analytical Hierarchy Process (AHP) and the Preference Ranking Organization Method for Enrichment Evaluations (PROMETHEE). The combination of both approaches enables a careful evaluation of the identified policy scenarios in which their strong and weak points are detected and a ranking is provided which facilitates the final selection for the decision-maker.