UPDATE
I-81 in Montgomery County is starting to reopen after a tractor-trailer crash Tuesday morning.
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According to VDOT, the southbound right lane and right shoulder are still closed as of 5:30 a.m.
ORIGINAL STORY
Interstate 81 southbound in Montgomery County is closed from US-11/Roanoke St to Route 8.
A tractor-trailer crash is to blame.
Stay with 10 News as this breaking news story develops.