While any work regulated by this article is in progress, proper barricades and warning notices or signs shall be placed by day, and flares or lanterns by night, for the purpose of giving notice of the work to all persons who may use or travel such streets, sidewalks, alleys or public ways; and the person doing the work, together with the landowner for whose benefit the work is done, shall, as a condition to the issuance of the permit therefor, save harmless the City from all liability or loss in the event of damage to person or property, including City employees and City property, which may result from such work.
(1967 Code §19-19)