(2)It is desirable to achieve widespread deployment of electronic road toll systems in the Member States and in the neighbouring countries, and to have, as far as possible, reliable, user friendly, and cost-efficient systems suited to the future development of road-charging policy at Union level and to future technical developments. Therefore, it is necessary to make electronic road toll systems interoperable to reduce the cost of, and the burdens linked to, the payment of tolls across the Union.