PHOTOS: The Tennessee Highway Patrol says all lanes of Interstate 81 south have reopened after a tractor-trailer hauling vehicles overturned near Bristol. The crash was first reported around 1:40 Thursday afternoon near mile marker 73. State troopers say the truck left the road when the driver swerved to avoid a vehicle that cut in front of it. The truck ended up in the median where it overturned. The truck driver was not injured, according to THP. Crews spent several hours cleaning up the scene.