An overturned tractor trailer in Robertston County, Tennessee is blocking northbound traffic on Interstate 65. The Tennessee Department of Transportation is estimating the blockage will be cleared by 3 p.m. An overturned tractor trailer in Robertston County is blocking the northbound left lanes on Interstate 65. Southbound traffic is affected with rubbernecking delays. The crash was reported at 7:20 a.m. and should be cleared by 3 p.m.