Abstract
Traffic planning has for several decades been based on assumptions of continued growth in road traffic. At the same time, society has formulated sustainability goals that recurrently collide with traditional planning and decision making. Why is that? One theory is that today’s models for analysis and methods for decision support are “path dependent” and in practice counteract sustainable urban development. Most likely, sustainable development requires a radical change of path. Would this change also require significant changes in the tools upon which analysis and methods for decision support are based?