ROANOKE COUNTY, Va. – UPDATE
All lanes are now open, and the detour is being removed, according to VDOT.
Authorities said congestion remains, so drivers should still expect delays.
The Virginia Department of Transportation says a multi-vehicle crash is the cause for a backup on Interstate 81 in Roanoke County.
Authorities said both southbound lanes of I-81 at mile marker 131.8 in Roanoke County remain blocked due to a multiple vehicle crash involving an overturned tanker.
Traffic can detour onto Route 11/460 at exit 132 (Dixie Caverns).
As of 10:15 a.m., traffic backups are approximately 5 miles.
Stay with 10 News for updates.