Two people were injured Monday after a tractor-trailer sideswiped two other vehicles on the shoulder of Interstate 81 South then overturned. According to a crash report from the Tennessee Highway Patrol, a tractor-trailer and Ford F-450 truck were on the shoulder of I-81 South near Exit 23 around 4 a.m.he Ford was a service truck conducting a roadside repair on the tractor-trailer.THP reports a second tractor-trailer headed south “failed to maintain the proper lane and ran onto the shoulder of the roadway.”