The provisions of sections 143(1), (3) and (4) and 144 of the 1991 Act shall not apply in any case where, on or before 31st December 1992, a roads, bridge or transport authority have given to an undertaker a notice of intention to execute works in accordance with paragraph 2(1) of Part I of the Fourth Schedule10 to the 1950 Act and has accepted that undertaker’s notice given under paragraph 3 of that Schedule as a specification of works and measures necessary to protect the undertaker’s apparatus.