Opinion of Advocate General Wahl delivered on 6 February 2019.#Republic of Austria v Federal Republic of Germany.#Failure of a Member State to fulfil obligations — Articles 18, 34, 56 and 92 TFEU — Legislation of a Member State prescribing an infrastructure use charge for passenger vehicles — Situation in which owners of vehicles registered in that Member State qualify for relief from motor vehicle tax in an amount corresponding to that charge.#Case C-591/17.