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.
The adjustable speed limits are the result of legislation passed in 2023 that allows speed limits to be temporarily lowered in response to weather, construction, congestion, or other safety concerns. The law was crafted following 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. Early work focused on testing the accuracy of Texas Department of Transportation road cameras and identifying highway segments where changing conditions could make fixed speed limits unsafe.
With that groundwork completed, 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. Similar signs have also been spotted on U.S. 54 in El Paso, signaling that the program is expanding beyond North Texas.
The concept of variable speed limits is not new to Texas. As far back as 2013, state lawmakers authorized TxDOT to test the effectiveness of changing posted speeds under certain conditions. Pilot programs were launched in areas including Temple, San Antonio, and Eastland County, with data later analyzed by the Texas A&M Transportation Institute. Those early studies helped shape the framework now being implemented statewide.
The renewed push gained urgency after the Feb. 11, 2021 pileup on I-35W, when icy roads led to a chain reaction involving 135 vehicles. Six people were killed and dozens were injured as cars and commercial trucks slid into one another during the early morning hours. The crash 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 will give transportation officials another tool to slow traffic before conditions turn deadly, potentially preventing future tragedies on Texas highways.