Before breaking up or interfering with any street to which the public has access in connection with the construction of any of the authorised works the Corporation shall (except in case of emergency) give 14 days' notice in writing to the chief officer of the fire and police authorities for the area in which such street is situated and make such arrangements with the chief officer of police as may be reasonably necessary so as to cause as little interference with the traffic in such street during the construction of such works as may be reasonably practicable.