GRAVES COUNTY, Ky., (KBSI) — Traffic on Interstate 69 southbound near the 21-mile marker has been reduced to one lane following a crash involving a semi-truck, according to the Graves County Sheriff’s Office. As of 1:30 p.m. Thursday, motorists could continue traveling southbound using the far-left lane or exit the interstate at Exit 21 to access U.S. 45 South/KY 80. Officials said traffic patterns may change as crews begin recovery operations f…