Highway frontage districts, hereinafter designated as H-1 districts, are established to protect selected areas adjacent to major routes for travel for highway oriented types of business use, so regulated as to prevent the impairment of safe and efficient movement of traffic, and to encourage development attractive to the traveling public, and compatible with adjacent agricultural and residential land uses, by provision of space for landscaping and for adequate off-street parking facilities. (Prior gen. code § 8-45.0)