In his valedictory lecture, The Roundabouts of European Law and Economics, Prof. Dr Roger Van den Bergh critically reflects upon three decades of research in European Law and Economics. He discusses the difficult reception of economic analysis of law in the 1980s-1990s, the spectacular growth of Law and Economics in both academia and policy circles at the turn of the millennium and the recent impact of behavioural economics on policy-making. Examples from different areas of law illustrate major insights of Law and Economics: the economic approach to competition law, the adverse effects of consumer protection and the current institutional crisis of the European Union (euro crisis, Brexit).