THOMPSON STATION Tenn. (WSMV) – A crash involving a tractor-trailer closed the interstate in the southern part of Williamson County early Monday morning. According to the Williamson County Sheriff’s Office, the semi was pulling a trailer on I-65 when it crossed over the median and crashed at mile marker 57, near I-840. The Tennessee Department of Transportation reported the crash occurred around 3:30 a.m.