88. Notwithstanding the temporary prohibition or restriction under the powers of article 12 (temporary prohibition or restriction of use of streets), WPD shall be at liberty at all times to take all necessary access across any such street and/or to execute and do all such works and things in, upon or under any such street as may be reasonably necessary or desirable to enable it to maintain any apparatus which at the time of the prohibition or restriction was in that street.