5(1)A local harbour authority shall, while a tidal work is being constructed, altered or extended—N.I.
(a)exhibit, at or near the work, every night from sunset to sunrise such lights as an appropriate department may specify;
(b)take such steps to prevent any danger to navigation as an appropriate department may specify.
(2)A local harbour authority shall, in relation to any tidal work, after the work is completed—
(a)exhibit every night from sunset to sunrise such lights as the Commissioners of Irish Lights may specify, at such places as may be so specified;
(b)take such steps to prevent any danger to navigation as those Commissioners may specify.
(3)If a local harbour authority contravenes sub-paragraph (1) or (2), it shall be guilty of an offence and liable—
(a)on summary conviction thereof, to a fine not exceeding[F1 level 3 on the standard scale];
(b)on conviction on indictment, to a fine.