In this subtitle:(1) 'Business district' means the territory adjacent to and including a highway if buildings used for business or industrial purposes, including a building used as a hotel, bank, office building, public building, or railroad station:(A) are located within a 600-foot segment along the highway; and(B) within that segment the buildings occupy at least 300 feet of frontage:(i) on one side of the highway; or(ii) collectively on both sides of the highway.(2) 'Residence district' means the territory, other than a business district, adjacent to and including a highway, if at least 300 feet of the highway frontage is primarily improved with:(A) residences; or(B) buildings used for business purposes and residences.(3) 'Urban district' means the territory adjacent to and including a highway, if the territory:(A) is not in a municipality; and(B) is improved with structures that are used for business, industry, or dwelling houses and located at intervals of less than 100 feet for a distance of at least one-quarter mile on either side of the highway. Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.