Crews worked for hours to remove a tractor trailer that slid down an embankment on Interstate 395 in Killingly on Friday morning.
State Police in Danielson said no one was injured.
The off-ramp near exit 37B on the southbound side of I-395 was closed at 1 a.m.
While investigators do not have a cause at this time, troopers said slick, icy conditions may be to blame.
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