1. Along any public highway within the meaning of section 4 of the Highway Safety Code (chapter C-24.2) that is used by visitors to enter or leave Québec, the signs and posters of the civil administration that are intended for visitors may be both in French and in another language up to a distance of 15 km from the point of entry into Québec, provided that French is markedly predominant within the meaning of the regulation defining the scope of that expression for the purposes of the Charter of the French language (chapter C-11).