A 2012 Kenworth tractor-trailer jackknifed at the 323 eastbound mile marker of I-40 earlier today. That created heavy traffic congestion for a few hours. The occupant escaped injury and was hauling produce. The scene was cleared just before a line of storms pushed into the area around 3 p.m. this afternoon. Troopers say the driver, 35-year-old Scott Robert Dengler of Big Sandy, Tennessee, was restrained and later cited for failure to exercise due care