MONTGOMERY COUNTY, Va. – UPDATE
All lanes are now open and traffic is beginning to move normally.
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ORIGINAL STORY
A tractor-trailer wreck is causing a traffic issue on I-81 South on Wednesday morning.
The southbound left lane is blocked at mile marker 112 in Montgomery County, which is close to the Christiansburg Route 8 exit.
All southbound lanes were closed at one point in that area.
Expect delays.
Check back for updates.