43If that should prove not to be the case, it would then be for the competent national authorities to show that that barrier to trade can be justified, in view of the products liable to be affected, by the objectives of protection of road safety and protection of the environment, which, according to the case-law, constitute overriding reasons in the public interest capable of justifying a measure having an effect equivalent to quantitative restrictions and that it is not only necessary, but proportionate in relation to such objectives (see, inter alia, judgment in Commission v Belgium, C‑150/11, EU:C:2012:539, paragraphs 54 and 55).
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