55In that regard, it is apparent from settled case-law that, when adopting measures to implement EU legislation, national authorities must exercise their discretion in compliance with the general principles of law, which include the principles of legal certainty and the protection of legitimate expectations (see, to that effect, judgment of 14 September 2006, Slob, C‑496/04, EU:C:2006:570, paragraph 41). National authorities are also required to exercise their discretion in compliance with their general duty of care under Article 4(3) TEU.
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