91However, those limitations and conditions must be applied in compliance with the limits imposed by Community law and in accordance with the general principles of that law, in particular the principle of proportionality. That means that national measures adopted on that subject must be necessary and appropriate to attain the objective pursued (see, to that effect, Joined Cases C-259/91, C-331/91 and C-332/91 Alluè and Others [1993] ECR I-4309, paragraph 15).
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