The aim of this study has been to explore success factors and barriers to the formation and implementation of single policy measures and policy packages in transport, and to identify strategies to manage such barriers. As a first step, we developed a typology of barriers and success factors for policy formation and implementation. Secondly, we carried out an empirical analysis of barriers and success factors in four cases of policy packaging: Urban Congestion Charging; National Heavy Vehicle Fees; Aviation in the European Emissions Trading System and The EU’s First Railway Package. The third and final task was to identify more general strategies to manage barriers in policy formation and implementation. A main conclusion in this report is that a conscious application of these strategies may contribute significantly to successful formation and implementation of even controversial policies or policy packages.