No person shall ride, drive or lead any animal; move or trundle any automobile or other vehicle upon any sidewalk, except light carriages for the conveyance of children, unless for the purpose of necessarily crossing the sidewalk; allow any vehicle or animal belonging to him, or in his care, to stand on any sidewalk; saw or cut or split firewood or lumber; break coal or stone; mix mortar on any sidewalk without a building permit or do any other act which obstructs the passage of pedestrians; provided, this section does not apply to bicycles.