art 47 Lights on tidal works during construction
(1) The Commissioners must at or near a tidal work during the whole time of its construction, extension, enlargement, alteration, replacement or relaying, exhibit every night from sunset to sunrise such lights, if any, and take such other steps for the prevention of danger to navigation as the Welsh Ministers from time to time direct. (2) If the Commissioners fail to comply with any direction given under paragraph (1), they are guilty of an offence and liable on summary conviction to a fine not exceeding the statutory maximum and on conviction on indictment to a fine.