This report is part of the ARENA project, a Swedish knowledge platform on road user charging. The report highlights how toll chargers and supervising authorities can enforce compliance with autonomous road toll system in an efficient and privacy protecting manner. Other aspects than road toll compliance and enforcement functions are exceptional in this report and for a comprehensive coverage of road charging, generic publications are recommended. The report is written from a Swedish perspective, but include an international outlook and aim at generic knowledge. Specific prerequisites for distance-based tolling in Sweden are the size of the country, the size of the population and the size of the vehicle fleet, leaving us with an extensive road network, sparse population and relatively few vehicles. Motorways and expressways counts for a relatively small share of the total road network, while secondary roads often are of good standard, in practice offering almost the same average speed as motorways, especially for trucks. This calls for extensive coverage of the road network if tolling is to be efficient, otherwise the leakage of traffic to non-taxed roads would be significant.