`Sustainability' as an unambiguous policy goal is not a priori secured, as is clearly shown in the transport sector, where the negative externalities are still increasing despite official policies aimed at a reduction of these external costs and at the achievement of a `sustainable transport system'. To analyze why this is the case, a conceptual model is developed in this paper. Stakeholders are identified which influence `sustainable transport policies'. These stakeholders are individuals, the public sector (subdivided into politicians and civil servants), international organizations and pressure groups (car industry, oil industry, car users and environmental groups). It appears that most incentives and mechanisms in the conceptual model of the decision-making process hamper the achievement of a `sustainable transport system'. The results of a questionnaire among Dutch transportation experts on the expected and desired future of European passenger transport are concisely discussed. The year 2030 is taken as a reference year. It appears that in the expected future the stakeholders largely behave as predicted in the conceptual model. In the desired future, however, the stakeholders have to change their attitudes drastically. Sufficient and appealing information, the existence of alternatives for car use and a cooperation of all stakeholders are key success factors for the achievement of a `sustainable transport system' in the future. (A)
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