Of relevance is a "national override" provision which usually states that national legislation would prevail over provincial legislation if: a) the national legislation deals with a matter that cannot be regulated effectively by legislation enacted by the respective provinces independently; b) the interests of the country as a whole require that a matter be dealt with uniformly across the nation (e.g. the setting of national norms and standards); or c) the national legislation is necessary for such matters as the protection of the environment.