Not according to the state law.
Sec. 545.352. PRIMA FACIE SPEED LIMITS. (a) A speed in excess of the limits established by Subsection (b) or under another provision of this subchapter is prima facie evidence that the speed is not reasonable and prudent and that the speed is unlawful.
Text of subsec. (b) as amended by Acts 1999, 76th Leg., ch. 663, Sec. 2 and Acts 1999, 76th Leg., ch. 739, Sec. 1
(b) Unless a special hazard exists that requires a slower speed for compliance with Section 545.351(b), the following speeds are lawful:
(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) 70 miles per hour in daytime and 65 miles per hour in nighttime if the vehicle is a passenger car, motorcycle, passenger car or light truck towing a trailer bearing a vessel, as defined by Section 31.003, Parks and Wildlife Code, that is less than 26 feet in length, passenger car or light truck towing a trailer or semitrailer used primarily to transport a motorcycle, or passenger car or light truck towing a trailer or semitrailer designed and used primarily to transport dogs or livestock, 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) 60 miles per hour in daytime and 55 miles per hour in nighttime if the vehicle is a passenger car or motorcycle on a highway that is outside an urban district and not a highway numbered by this state or the United States;
(4) **60 miles per hour **outside an urban district if a speed limit for the vehicle is not otherwise specified by this section; or
(5) outside an urban district:
(A) 60 miles per hour if the vehicle is a school bus that has passed a commercial motor vehicle inspection under Section 548.201 and is on a highway numbered by the United States or this state, including a farm-to-market road;
(B) 50 miles per hour if the vehicle is a school bus that:
(i) has not passed a commercial motor vehicle inspection under Section 548.201; or
(ii) is traveling on a highway not numbered by the United States or this state; or
(C) 60 miles per hour in daytime and 55 miles per hour in nighttime if the vehicle is a truck, other than a light truck, or if the vehicle is a truck tractor, trailer, or semitrailer, or a vehicle towing a trailer other than a trailer described by Subdivision (2), semitrailer, another motor vehicle or towable recreational