However, a number of issues remained unresolved at that time, in particular compulsory earmarking of external cost charge revenue and the introduction of a specific congestion charge, proposed by the Commission and supported by the European Parliament.
Kuid tookord jäi mitu küsimust lahendamata, eelkõige väliskulumaksust saadava tulu kohustuslik eraldamine ja spetsiaalse ummikumaksu kehtestamine, mida soovitas komisjon ja mida toetas Euroopa Parlament.