Texas drivers in San Antonio, Waco, and Eastland County may notice new speed limit signs on their daily commute – digital signs with variable speed limits that change throughout the day. The variable speed limit signs are part of a TxDOT pilot program designed to increase highway safety.

Speed limits will vary from current posted speed limits down to 30 mph, depending on how fast traffic is moving. Factors such as road conditions, weather and construction will also be taken into account. Changes will occur in 5 mph increments.

Drivers can be ticketed if they are caught violating the speed limits posted on the electronic signs.

The idea is to increase safety by warning drivers about the speed of traffic, as well as to prevent congestion before it starts. This strategy of spacing and pacing is used in other states, from Florida to Washington. The use of Active Traffic Management, or ATM, has had positive effects on traffic safety and congestion.

Eventually, the Texas Transportation Commission and the state Legislature will evaluate the TxDOT pilot program and decide whether or not to adopt the variable speed system.