43 Tex. Admin. Code § 219.9
Notwithstanding any provisions in this chapter, this chapter does not authorize the operation of a vehicle or vehicle combination on the following roadways in this state to the extent the Federal Highway Administration determines the vehicle or vehicle combination exceeds the applicable weight or size for such roadway under 23 U.S.C. § 127, 49 U.S.C. §§ 31111 through 31114, or federal regulations prescribed under 23 U.S.C. § 127 or 49 U.S.C. §§ 31111 through 31114: the federal-aid primary system, the federal-aid urban system, and the federal-aid secondary system, including the national system of interstate and defense highways. To the extent the department learns that the Federal Highway Administration generally determines a vehicle or vehicle combination exceeds the applicable weight or size for such roadway under 23 U.S.C. § 127, 49 U.S.C. §§ 31111 through 31114, or federal regulations prescribed under 23 U.S.C. § 127 or 49 U.S.C. §§ 31111 through 31114 in a way that may conflict with a provision in this chapter, the department will post a notice on its website and may provide notice to permittees through the applicable email addresses on file with the department.
43 Tex. Admin. Code § 219.9