194Furthermore, in so far as it proves necessary to further specify certain practical arrangements for the implementation, by transport undertakings, of their obligations under point 6(d) of Article 1 of Regulation 2020/1054, such as those relating to proof of compliance with that provision, it should be noted that Article 18 of Regulation No 561/2006, which was not amended by Regulation 2020/1054, expressly authorises the Member States, in accordance with Article 291(1) TFEU, to adopt the measures necessary for the application of Regulation No 561/2006. It is settled case-law that Member States may adopt rules for the application of a regulation provided that they do not thereby obstruct its direct applicability or conceal its nature as an act of EU law; that they specify that they are acting in the exercise of a discretion conferred on them under that regulation; and that they adhere to the parameters laid down thereunder (judgment of 12 April 2018, Commission v Denmark, C‑541/16, EU:C:2018:251, paragraph 28 and the case-law cited).
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