This pre-study presents an inventory on a general level of knowledge about studies made in the Nordic countries about the effects of ITS.The ITS Working Group of the Nordic Council of Ministers initiated the study with the objective to map on a general level the available knowledge of the deployment of ITS (Intelligent Transport Systems) in the Nordic countries and to make a proposal on how the knowledge could be easily accessible as well for planners as for decision makers.After implementation of the proposals made the total knowledge in the Nordic countries could easier be used in each country. Furthermore the results of this study can as such assist in coordinating and directing the future research work on the Nordic level.