Decision making in transport infrastructures

This paper is about decision making in transport infrastructures, an area in which most often several actors are involved, each with its own interests, in which decision making tries to optimize different and often conflicting criteria simultaneously, and in which decision making has to take place at different levels, distinguished by geographical extent and time scale. We distinguish several classes of solution methods. A number of cases illustrate how the solution methods are being applied in practice. There we see a tendency to combine methods and to support decision making by means of computer-based simulation, where the different levels are reflected in different simulation tools.