The Texas Transportation Commission approved 75 mph speed limits for nearly 1,500 miles of interstate in 60 counties.

The action follows a state law approved last year providing for the Texas Department of Transportation to see whether 70 mph speed limits safely can be raised to 75 mph, and to hike the speed as warranted.

Before passage of that law, higher speed limits were limited to rural counties and highways mostly in West Texas, according to TxDOT. Under the previous law, Texans could drive 75 mph on 1,445 miles of highway and 80 mph on other stretches.

In the wake of the 2011 law, the commission allowed higher speed limits on four Central Texas highways, then added the additional highways Wednesday.

The action means drivers will be able to go 75 mph or faster on almost 3,600 miles of highway, according to TxDOT.

Be warned, though: The higher speed limit won’t be official until new signs go up.

Here’s a list of highways on which new speed limits were approved Thursday:

I-10: 289 miles across El Paso, Gillespie, Kerr, Kendall, Bexar, Guadalupe, Caldwell, Gonzales, Fayette, Colorado, Austin, Jefferson and Orange counties I-20: 423 miles across Crane, Ector, Midland, Martin, Howard, Mitchell, Nolan, Taylor, Callahan, Eastland, Erath, Palo Pinto, Van Zandt, Smith, Gregg and Harrison counties I-27: 109 miles across Lubbock, Hale, Swisher and Randall counties I-30: 139 miles across Hunt, Hopkins, Franklin, Titus, Morris and Bowie counties I-35: 106 miles across Webb, Medina, Atascosa, Bexar, Hill and Cooke counties I-37: 130 miles across Nueces, San Patricio, Live Oak, Atascosa and Bexar counties I-40: 166 miles across Deaf Smith, Oldham, Potter, Carson, Gray, Donley and Wheeler counties I-44: 11 miles across Wichita County I-45: 143 miles across Walker, Madison, Leon, Freestone and Navarro counties

For more information, check out http://www.txdot.gov/safety/speed_limit/75mph.htm