Texas Transportation Code - TRANSP § 545.352. Prima Facie Speed Limits

(1) 30 miles per hour in an urban district on a street other than an alley and 15 miles per hour in an alley;

(2) except as provided by Subdivision (4), 70 miles per hour on a highway numbered by this state or the United States outside an urban district, including a farm-to-market or ranch-to-market road;

(3) except as provided by Subdivision (4), 60 miles per hour on a highway that is outside an urban district and not a highway numbered by this state or the United States;

(4) outside an urban district:

(5) on a beach, 15 miles per hour; or

(6) on a county road adjacent to a public beach, 15 miles per hour, if declared by the commissioners court of the county.

(1) “Interstate highway” means a segment of the national system of interstate and defense highways that is:

(2) “Light truck” means a truck with a manufacturer's rated carrying capacity of not more than 2,000 pounds, including a pick-up truck, panel delivery truck, and carry-all truck.

(3) “Urban district” means the territory adjacent to and including a highway, if the territory is improved with structures that are used for business, industry, or dwelling houses and are located at intervals of less than 100 feet for a distance of at least one-quarter mile on either side of the highway.