Tex. Transportation Code § 541.102: RESTRICTED DISTRICTS.

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.