CLEARFIELD, Pa. -  Newly released data shows that variable speed limit signs installed along Interstate 80 in Mercer County and other parts of the state have helped reduce winter traffic accidents and deaths.

The Pennsylvania Department of Transportation and other state agencies said on Friday that the technology allows officials to lower speed limits quickly when snow squalls or ice make driving dangerous.

According to state data, the use of the signs has led to a 7% decrease in winter crashes on I-80. More significantly, serious injuries and fatalities in those accidents dropped by 34% compared to the previous five-year average.

In Mercer County, PennDOT operates five of the signs. They are located near the Ohio state line to mile marker 6, and between mile markers 16 and 20.

"Safe driving is important year-round, but it’s even more essential in the winter when weather conditions can change quickly," PennDOT Secretary Mike Carroll said.

When weather conditions are clear, the digital signs display the normal speed limit. When visibility drops, the signs change to a lower speed, and yellow lights at the top and bottom flash to alert drivers.

State police officials noted that drivers can still be ticketed for driving too fast for conditions even if they are traveling below the posted limit.

To help drivers prepare for sudden winter weather, the state also highlighted a new, free snow squall driving simulator. The simulation is available online and for virtual reality headsets to show motorists how to react when visibility drops to near zero.