Such person shall construct and maintain, during the progress of such work, a good and sufficient fence, from sidewalk to sidewalk, enclosing such excavation; provided, that a driveway may be left in such fence during the actual delivery of material into or from such excavation, such driveway to be safely closed, except when in actual use. Such person shall furthermore construct and maintain a sidewalk free from obstructions, from the permanent sidewalk to sidewalk, not less than three feet (3') in width and composed of plank not less than two inches (2") in thickness around such excavation, or such materials or fence. (Ord. 621, 12-17-1906)