51As regards compliance with the principle of effectiveness, it should be noted that, in accordance with the case-law, every case in which the question arises as to whether a national procedural provision makes the application of EU law impossible or excessively difficult must be analysed by reference to the role of that provision in the procedure, its operation and its particular features, viewed as a whole, before the various national bodies. In that context, it is necessary to take into consideration, where relevant, the principles which lie at the basis of the national legal system, such as the protection of the rights of the defence, the principle of legal certainty and the proper conduct of the proceedings (judgment of 20 May 2021, X (LPG road tankers), C‑120/19, EU:C:2021:398, paragraph 72).
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