In order to support a possible introduction of distance-based road user charging for Heavy Goods Vehicles (HGV) in Sweden, the R&D project ARENA has conducted field trials. TheARENA Trials have tested and demonstrated a road user charging concept, from November2009 till April 2010.The ARENA concept is adapted to both national requirements and harmonised withEuropean legislation and standardisation and introduces a competitive environment, the TollService Provider, to stimulate effective and creative business solutions. The tariffs used inthe trials were based on the marginal cost principle, with the charge being based ondifferentiation on time, place and vehicle characteristics.The overall goal of the ARENA Trials was to test and demonstrate the ARENA concept’sviability and attractiveness.The ARENA Trials has been divided into two main parts; the Field Trial and the Test Track.The first part of the ARENA Trials, the Field Trial, was conducted on a day to day basis onthe whole road network of the two Swedish southern provinces Skåne and Blekinge usingtrucks driving their ordinary routes. The Test Tack was a controlled blind test for theparticipating Toll Service Providers (TSPs) which consisted of a 45 kilometres long routeexposing the TSPs’ systems to different challenges to test charging accuracy, i.e. their abilityto charge correctly in a challenging environment.