Not surprised that Texas has this; I-10 after you get past El Paso heading East is 80mph.
Having driven this route from Northern California and the Pacific Northwest to San Antonio since 1969, and seen all the Speed Limit changes, it was such a welcome sign to see the speed limit there up to 80mph..
I have driven through this same area in the middle of the night Before the 80mph change, and the 18-wheelers are ALL going up to 100mph through there and you better be ready to "Play" or get the heck out of their way..

It is absolutely pitch black out there at night and the gas stations are far and few between..
In the area that has the 80mph speed limit, I have seen complete idiots flying past me well, well, over 80mph and then I ALWAYS see them pulled over by the Highway Patrol..
I have traveled this route since before there was a freeway running all the way through Phoenix AZ, and you had to stop a zillion stoplights going West to eventually get to the other end where you saw "Indian School Road" and knew you were almost out of Phoenix and would get to get back on I-10 again..
Think with all the extra trips plus the twice/year, I have driven this route to San Antonio, over 125 times, (round trip, around 4,000 miles from NorCal) = 500,000..
Was doing this even Before Valentine-1 was invented..
And after all this driving = 0 speeding tickets.. And Yes, I bought a Valentine-1 back in the year 2001..
Anymore, it is just too dangerous out there to go really fast, not because of my or your abilities, but because of absolute complete idiots doing equally idiotic things while driving that has ruined it for everyone...
Dan F