The Tennessee Department of Transportation has temporarily closed a southbound lane on Interstate 81 near Fall Branch following an incident involving a jackknifed tractor-trailer. According to TDOT’s SmartWay Traffic Map, the accident occurred at around 4:02 a.m. on Saturday at mile marker 49. By 5:30 a.m., officials were still working to address the situation and clear the roadway. Travelers are advised to exercise caution and expect potential delays in the area as the cleanup and investigation continue.