Article L2213-1-1 of the French General Code of Local Authorities
Without prejudice to article L. 2213-1, the mayor may, by reasoned decree, set for all or part of the roads in the built-up area open to public traffic a maximum authorised speed lower than that laid down in the Highway Code, having regard to a need for road safety and traffic, mobility or environmental protection. The mayor may also, by reasoned decree, lay down rules derogating from those provided for…