ROANOKE COUNTY, Va. - UPDATE
The crash has been cleared.
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ORIGINAL STORY
A tractor-trailer crash on Interstate 81 South in Roanoke County is causing delays.
At this time, traffic is backed up for about three miles at the 144.5 mile marker, according to VDOT. Authorities say the south right shoulder is closed.
We will update this article once the crash is cleared.