20In the light of the derogations concerning use of a tachograph, the Court has held that such a derogation may not be interpreted in such a way as to extend its effects beyond what is necessary to safeguard the interests which it seeks to secure, and the scope of the derogations which it lays down must be determined in the light of the aims pursued by the legislation at issue (see Case C-116/91 British Gas [1992] ECR I-4071, paragraph 12; Case C-39/95 Goupil [1996] ECR I-1601, paragraph 8; Case C-335/94 Mrozek and Jäger [1996] ECR I-1573, paragraph 9; Case C-128/04 Raemdonck and Raemdonck-Janssens [2005] ECR I-2445, paragraph 19; and Case C-554/09 Seeger [2011] ECR I-7131, paragraph 33).
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