Article 8
1. Two or more Member States may cooperate in introducing a common system for user charges applicable to their territories as a whole. In that case, those Member States shall ensure that the Commission is closely involved therein and in the system's subsequent operation and possible amendment. 2. A common system shall be subject to the following conditions in addition to those in Article 7: (a) the common user-charge rates shall be set by the participating Member States at levels that are not higher than the maximum rates referred to in Article 7(7); (b) payment of the common user charge shall give access to the network as defined by the participating Member States in accordance with Article 7(2); (c) other Member States may join the common system; (d) a scale shall be worked out by the participating Member States whereby each of them shall receive a fair share of the revenues accruing from the user charge. CHAPTER IV Final provisions