Video: Echoes from the fog

On Dec. 11, 1990, motorists traveling along Interstate 75 near Calhoun, Tenn., experienced something most will never forget. When the wall of fog that had enshrouded the interstate lifted, officials determined there had been a 99-car pileup on both the North and southbound sides. Ultimately 12 people died and 42 were injured. The accident is still the largest multi-vehicle crash in Tenn. history.