Update: I-81 at Mile Marker 176 is now reopened to traffic.
Update 7:15 a.m.: Rockbridge County officials say the driver of a tractor trailer was killed after he ran his truck off I-81.
According to Public Safety Director Robert Foresman, the tractor trailer hit a bridge near the Natural Bridge exit and caught fire. He says there's not much left of the big rig.
All northbound lanes are still closed.
Rockbridge Co., VA - Drivers in Rockbridge County should expect delays on Interstate 81.
According to Public Safety Director Robert Foresman, there is an accident at Mile Marker 176. Traffic is being detoured at exit 175.
Foresman sent a photo from the scene about 5 a.m.
We will bring you more information as we get it.