Drivers across parts of Texas are beginning to see electronic speed limit signs capable of changing in real time, marking a new phase in the state’s effort to reduce serious crashes during dangerous driving conditions.
Born Out of Tragedy
The adjustable speed limits stem from legislation passed in 2023 that allows speed limits to be temporarily lowered in response to weather, construction, congestion, or other safety concerns. Lawmakers crafted the bill after a catastrophic pileup in Fort Worth during the winter storm of 2021, when icy conditions contributed to one of the deadliest traffic incidents in state history.
Under the law, the Texas Transportation Commission was given authority to create and manage a variable speed limit system. Last year, the commission amended the Texas Administrative Code to formally establish a Variable Speed Limits Program, with early work focused on testing the accuracy of TxDOT road cameras and identifying highway segments where changing conditions could make fixed speed limits unsafe.
Where the Signs Are Showing Up First
With that groundwork finished, drivers are now seeing the first physical signs installed along major roadways. Electronic speed limit displays have appeared on Interstate 35W in Fort Worth — the same corridor where the 2021 crash occurred — and similar signs have also turned up on U.S. 54 in El Paso, signaling the program is expanding beyond North Texas.
A Concept Texas Has Tested Before
Variable speed limits aren’t actually new to Texas. As far back as 2013, state lawmakers authorized TxDOT to test the effectiveness of changing posted speeds under certain conditions, with pilot programs launched in Temple, San Antonio, and Eastland County. The Texas A&M Transportation Institute later analyzed that data, and those early studies helped shape the framework now being rolled out statewide.
The Crash That Pushed It Forward
The renewed push gained urgency after the Feb. 11, 2021 pileup on I-35W, when icy roads triggered a chain reaction involving 135 vehicles. Six people were killed and dozens more injured as cars and commercial trucks slid into one another during the early morning hours, in a crash that occurred amid a historic winter storm that ultimately claimed 246 lives statewide and left millions without power.
State officials hope the new variable speed limit signs give transportation officials another tool to slow traffic down before conditions turn deadly, with the goal of preventing a repeat of that tragedy on Texas highways.