On Friday, Texas Governor Rick Perry (R) signed HB 2257 into law making 80 MPH the maximum allowable speed in the state. Rural portions of I-10 and I-20 will enjoy the new top speed, while other rural roads could see the limit rise to 75 MPH. Both the state House and Senate adopted the legislation without opposition last month.
Source:
http://www.thenewspaper.com/news/04/473.asp