(1) A determination under regulation 8, 9 or 10 may be amended or revoked by the relevant Board.
(2) If a Board amends a determination under regulation 8, 9 or 10, the Board must ensure that the details of the amendment are included on any signs erected under regulation 11.
(3) If a Board revokes a determination under regulation 8, 9 or 10, the Board must ensure that any signs erected under regulation 11 relating to that determination are removed.