A main output from ARENA 1 was "The Concept" - a comprehensive solution for a distance-based road user charging scheme tailored for a Swedish kilometer tax. In the ARENA 2.0 field trials the Concept was developed, implemented and operated as a technical system1. The development and test period provided important knowledge and experiences, and the preparations for and discussions during the test called for modifications of details of the concept. However, the most important conclusion from ARENA 2.0 is that the fundamentals of the ARENA 1 Concept remain valid: -· The role model with a single TC and parallel competing TSP´s provided an efficient solution with very limited problems. It also provided important experience, e.g. the big differences in TSP performance. -· The tariff scheme, i.e. a link based price list based on NVDB, worked well in principle and could be managed by all TSP´s. -· The road usage declaration compiled and provided by the TSP worked very well. -· The key principles of the compliance checking mechanisms remain unchanged. -· The communication interfaces worked well, and the standards applied served well their purpose. It shall be observed that these conclusions are based on discussions and field trials mainly focusing on autonomous Road User Charging. There are however no evidence that other conclusions should be drawn if DSRC based systems had been in focus during the project.