PULASKI COUNTY, Va. – UPDATE
As of 8:45 p.m., the accident has been cleared and traffic is flowing.
Traffic is backed up for about 4 miles on I-81 due to a tractor-trailer crash in Pulaski County, according to Virginia Department of Transportation.
The crash happened at mile marker 103 on I-81 north, and the north and south left shoulder and left lane are closed.
There are also 2 miles of congestion on the northbound side.