ROANOKE CO., Va. (WDBJ7) UPDATE: All northbound lanes are now open and traffic is moving along.
A wreck is causing major slowdowns on I-81 in Roanoke County Wednesday morning.
The northbound left lane is blocked at mile marker 134. It is foggy in that area.
There is a 2-mile backup as of 7:45 a.m.
Avoid the area if possible.