29Furthermore, the concepts of ‘working time’ and ‘rest period’ are concepts of EU law which must be defined in accordance with objective characteristics by reference to the scheme and purpose of Directive 2003/88. Only an autonomous interpretation of that nature is capable of ensuring the full effectiveness of that directive and the uniform application of those concepts in all the Member States (see, to that effect, judgment of 9 March 2021, Radiotelevizija Slovenija (Period of stand-by time in a remote location), C‑344/19, EU:C:2021:182, paragraph 30 and the case-law cited).
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