All persons owning or maintaining shade or ornamental trees or shrubs upon or in front of the premises owned or occupied by them shall keep the same trimmed and in such condition so as not to interrupt a clear vision of both vehicles and foot traffic, or interfere with the wire, poles or fixtures maintained or owned by any department of the city, or permit the same to come in contact therewith or so obstruct or interfere with any lamp standard as to prevent the proper diffusion of light therefrom. Such owning or maintaining of trees or shrubs is declared to be a public nuisance. (Ord. 100 § 1, 1967).