WYTHE COUNTY, Va. – UPDATE
The wreck is now cleared.
A wreck is causing a major backup on I-81 North in Wythe County on Wednesday morning.
State police responded to the wreck at mile marker 83 around 6:20 a.m. That's near the I-77 interchange.
There is thick fog in the area.
The northbound right lane is blocked and traffic is significantly backed up.
State police dispatch was not aware of any injuries.