42Next, although, as is clear from paragraphs 30 and 31 above, Directive 2003/88 does not preclude employers and workers from adopting, by collective agreement pursuant to national legislation, rules aiming to contribute generally to an improvement of workers’ working conditions, the detailed implementing rules must, however, respect the limits flowing from that directive (see, to that effect, judgment of 16 March 2006, Robinson-Steele and Others, C‑131/04 and C‑257/04, EU:C:2006:177, paragraph 57).
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