It is unlawful for any person to cause or permit any building materials, machinery, sand, dirt, or other object to be in or upon the streets, alleys, or sidewalks of the Municipality without first obtaining a permit from the Town for such use of streets, alleys, or sidewalks; provided, that whenever a permit is issued, such permit shall carry the right to place materials, machinery or other objects upon the streets, alleys, or sidewalks, subject to the conditions as are deemed necessary for the safety of persons on or about such streets, alleys or sidewalks and which are set forth in such permit. (1987 Code § 12.04.040)