CARYVILLE, Tenn. (AP) — A rock slide has shut down Interstate-75 in both directions in Campbell County, about 30 miles from the Kentucky border.

Tennessee Department of Transportation spokesman Mark Nagi wrote on his Twitter account on Saturday that motorists should be prepared to use alternate routes for weeks to come.

Nagi told WVLT-TV (http://bit.ly/1VKe8bO) the long closure is needed to give workers time to clean-up the slide and stabilize the area, making sure it is safe.

Northbound traffic is being diverted at exit 134 at Caryville. Southbound traffic is being diverted at exit 160 at Jellico.

The slide happened Friday afternoon, and drivers told the station they were waiting about an hour to get off the interstate.