(a) No person shall install, maintain, use or operate any trap door, coal hole or other sidewalk opening, unless the doors or covers for such opening are of metal or reinforced concrete, with nonslip wearing surface, and present no hazard to traffic.
(b) No coal hole, trap door or other sidewalk opening shall be allowed to remain open except when actually in use.
(c) When any coal hole, trap door or other sidewalk opening is open, such opening shall be protected by guards not less than thirty-two inches in height and fully protecting all sides of the opening. However, the guard on the loading side may be removed therefrom during the period of loading and unloading.
(1979 Code Sec. 13.16.160)