1. Institute of Social Studies, University of Tartu, Tartu, Estonia
2. Institute for Transport Economics, Norwegian Centre for Transport Research, Oslo, Norway
3. European Affairs Office, Brussels, Belgium
4. VTT Finland, Helsinki, Finland
5. Department of Economics and Management, University of Trento, Trento, Italy
6. University of Trento, Trento, Italy
7. Geonardo Ltd, Budapest, Hungary