All openings made in the sidewalks or roadways for the purpose of constructing house drains or private sewers, shall be surrounded and efficiently protected at all hours by ample and sufficient barriers, upon which red signal lights shall be placed and maintained at night time, together with such additional precautions as may be deemed necessary for the absolute protection of the traveling public. The conditions of this clause are imperative, and drain layers will be held responsible for all claims that may arise from damages to persons or property following the neglect or violation of any of its provisions.