Whenever any walk shall be removed for the purpose of excavating any premises or in the course of erection of any building, no building material shall be placed on any portion of any sidewalk, or any sidewalk shall become obstructed on the account of the erection of any building or the placing of any material thereon, the contractor doing such excavating or erecting such sidewalk which is to remain in such condition for a period of more than twenty four (24) hours, immediately protect such sidewalk by good and substantial fence at each end thereof and must place and maintain red lights thereon between sunset and sunrise and the engineer shall have control over the same and may at any time require additional fences to be erected or fences to be more substantial or additional red lights to be placed thereon, and such contractor shall also construct and maintain a temporary sidewalk in the street, which temporary sidewalk shall be of plank not less than two inches (2") thick and such sidewalk to be not less than three feet (3') in width, and must extend from sidewalk to sidewalk around such removed or obstructed sidewalk and shall not be removed until such permanent sidewalk is open for traffic. (Ord. 97, 8-5-1910)