1:47 p.m.
VDOT says acccident has been cleared.
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1:01 p.m.
VDOT now says there's a 3-mile back-up.
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12:50 p.m.
VDOT says the southbound left lane and left shoulder of Interstate 81 are blocked near Radford in Montgomery County.
There's a 1 mile back-up.
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