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Pennsylvania Winter Thanksgiving Travel: Even Salted I-80 Can Freeze
Harrisburg, PA – Pennsylvania drivers preparing to travel Interstate 80, Interstate 76 and Interstate 81 this Thanksgiving may be putting too much faith in something they see every winter: road salt.
By Lauren Beckett · 2026-11-11T19:04:17.528Z
Harrisburg, PA – Pennsylvania drivers preparing to travel Interstate 80, Interstate 76 and Interstate 81 this Thanksgiving may be putting too much faith in something they see every winter: road salt. Even freshly treated highways can become dangerously icy when temperatures plunge, creating a hidden hazard for motorists crossing the state during one of the year's busiest holiday travel periods.
According to winter maintenance guidance from transportation agencies, traditional road salt becomes increasingly less effective as pavement temperatures approach 20 degrees Fahrenheit, with its ability to melt ice declining further as temperatures fall into the teens and single digits.
And that's where a common winter driving assumption can become dangerous.
Why Even Salted Pennsylvania Highways Can Freeze Road salt isn't magic. It lowers the freezing point of water, helping melt ice and prevent some freezing when conditions allow.
However, as pavement temperatures drop, the melting process slows considerably. Around 20 degrees, conventional salt works much more slowly than it does near freezing. Below 15 degrees, salt alone may struggle to melt ice quickly enough to improve traction.
For motorists traveling through Pittsburgh in Allegheny County, Harrisburg in Dauphin County, Scranton in Lackawanna County and State College in Centre County, that limitation matters.
Major routes including I 80, the Pennsylvania Turnpike I 76 , I 81, I 79 and I 476 can remain slippery despite treatment, particularly on bridges, overpasses, mountain passes and shaded stretches.
Thanksgiving Travel Could Increase the Danger Thanksgiving falls Thursday, Nov. 26, bringing holiday travelers onto Pennsylvania's major interstate corridors connecting Philadelphia, Pittsburgh, central Pennsylvania and neighboring states.
If snow, freezing rain or rapidly falling temperatures develop during the holiday travel period, even treated highways could become dangerously slick.
The risk can increase overnight and early in the morning, when pavement temperatures fall and moisture refreezes.
PennDOT and the Pennsylvania Turnpike Commission use multiple winter maintenance strategies, but no treatment guarantees ice free pavement under every condition.
Before departing, drivers should check National Weather Service forecasts and Pennsylvania's 511PA traveler information service for updated road conditions.
The bottom line: A salted interstate is not necessarily a safe interstate. Motorists should reduce speed, increase following distances and remain alert for icy patches even when pavement appears clear.