New variable speed limit signs are appearing across Texas. What to know
When icy conditions led to a 133-car pileup on Interstate 35W in Fort Worth back in 2021, it showed just how quickly traffic can spiral when the weather turns.
Now, drivers across Texas may start noticing new illuminated signs flashing different numbers along major highways.
The signs are part of what’s known as variable speed limits, a new system the state is beginning to roll out.
But what exactly are they, and why are they appearing on Texas roads? Here’s what to know.
What is a variable speed limit?
A variable speed limit is a digital sign that allows transportation officials to temporarily lower or raise speed limits based on conditions like traffic, construction, or severe weather.
Instead of one permanent speed limit sign, these displays can be updated remotely by engineers at the Texas Department of Transportation (TxDOT).
The system became legal statewide after lawmakers passed House Bill 1885, which took effect in 2023.
The law gives TxDOT the authority to temporarily adjust speed limits without waiting for approval from the statewide transportation commission, a process that could take months.
Why are these signs being added near downtown Fort Worth?
TxDOT has started installing the new digital speed limit signs along I-35W just north of downtown Fort Worth.
This is one of the busiest and most accident-prone areas in the city, especially during construction or bad weather.
Lawmakers who supported the bill said Fort Worth’s 2021 pileup was a key example of why the system is needed.
Heavy fog, icy bridges and limited visibility led to a deadly chain reaction of crashes that morning.
When can variable speed limits be changed?
The limit can only be lowered by up to 10 miles per hour from the regular posted speed.
For example, if a stretch of highway is normally 70 mph, it could temporarily drop to 60 mph when fog or ice moves in.
Once conditions improve, engineers can return the limit to normal.
But the change is only valid when the altered limit is displayed on a digital sign or message board along the road.
How do drivers know when it changes?
Drivers will see the new speed posted on electronic signs, which may be mounted above lanes or placed along the side of the highway.
TxDOT can also use mobile message boards or temporary trailer signs in work zones.
State Rep. Terry Canales, who authored the bill, said the goal is to make sure speed limits match real-world conditions.
“If we’re not able to alter or modify the speed limit to reflect the current conditions, safety is in jeopardy,” he told The Texas Tribune.
Are other Texas cities using these signs?
Yes. TxDOT first tested them in places like Temple, San Antonio, and in Eastland County back in 2014.
Data from that pilot program, analyzed by the Texas A&M Transportation Institute, showed improved safety and fewer crashes.
The results helped convince lawmakers to make the system permanent and available statewide.
The system is now expected to grow as more cities and highways install the digital signage needed to support it.
