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Maine Winter Thanksgiving Travel: Even Salted I-95 Can Freeze
Portland, ME – Maine drivers preparing to travel Interstate 95 and Interstate 295 this Thanksgiving may be putting too much faith in something they see every winter: road salt. Even freshly treated hi
By Owen Prescott · 2026-11-11T19:00:20.160Z
Portland, ME – Maine drivers preparing to travel Interstate 95 and Interstate 295 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, leaving motorists vulnerable to slippery conditions despite efforts to keep roads clear.
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 sharply as temperatures fall into the teens and single digits.
That's where a common winter driving assumption can become dangerous.
Why Even Salted Maine Highways Can Freeze Road salt isn't magic. It works by lowering the freezing point of water, helping prevent or melt ice under suitable conditions.
But as pavement temperatures fall, 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 maintain safe driving conditions.
For drivers traveling through Portland in Cumberland County, Augusta in Kennebec County, Bangor in Penobscot County and communities farther north, that limitation matters.
Major routes including I 95, I 295 and U.S. Route 1 can remain slippery even after treatment, particularly on bridges, overpasses, shaded stretches and exposed roadways.
Thanksgiving Travel Could Bring Added Risks Thanksgiving falls Thursday, Nov. 26, bringing holiday travelers onto Maine's busiest interstate corridors.
If freezing temperatures coincide with snow, sleet or freezing rain, treated highways could still develop dangerous icy patches.
The risk can increase overnight and early in the morning, when pavement temperatures fall and moisture refreezes.
MaineDOT uses multiple winter maintenance strategies, but road treatments cannot guarantee ice free pavement under every condition.
Travelers should check National Weather Service forecasts and Maine's 511 traveler information system before departing.
The bottom line: A salted highway is not necessarily a safe highway. Drivers should reduce speed, increase following distances and remain alert for ice even when roads appear clear.