UPDATE
Lanes are now back open after a tractor-trailer crash closed of I-81N in Rockbridge County.
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Authorities say traffic is now backed up for about 3 miles.
ORIGINAL STORY
A crash has closed I-81 North in Rockbridge County, according to the Virginia Dept. of Transportation.
Authorities say the accident happened near mile marker 190, about one mile south of the I-64 exit.
As of 10:40 a.m., traffic is backed up for about 12 miles.