20.—(1) Subject to sub-paragraphs (2) and (3) construction work must not take place other than between 0700 and 1900 hours, Monday to Friday and 0700 to 1300, Saturday and at no time on bank holidays and Sundays.
(2) Drilling operations must not take place other than between 0700 and 1700 hours on Mondays to Fridays.
(3) Protective netting of scaffolding and its subsequent removal across highways may occur outside of the construction hours.
(4) Stringing of the line across the highway may be undertaken outside of the construction hours subject to the prior written approval of the relevant planning authority.