BOTETOURT CO., Va. (WDBJ7) -- UPDATE: 5:00 p.m.
As of 4:52 p.m. Thursday, the accident has been cleared and the lanes have reopened to traffic, according to VDOT.
UPDATE: 2:30 p.m.
As of 2:30 p.m. Thursday, VDOT is reporting six miles of backups.
At this time, traffic is able to get through the area in the right shoulder.
Both lanes are still closed.
A tractor trailer accident has closed all lanes on Interstate 81 in Botetourt County.
According to the Virginia Department of Transportation, drivers may run into delays on Interstate 81 South at mile marker 150 Botetourt County because of a tractor trailer accident.
As of 1:50 p.m., VDOT is reporting the south left lane and right lane are closed.