UPDATE: The incident was cleared up around 9 p.m. Saturday night.
Southbound traffic on I-75 in Campbell County is being diverted at the Caryville exit because of a tractor-trailer fire.
The TDOT Smartway map shows the cargo fire was reported at 1:56 p.m. Saturday just north of the Rocky Top exit.
Crews expect the scene to be cleared by 10 p.m.
TDOT said the tractor-trailer fire is not causing delays in the northbound lanes.