sentences:  This section is the most heavily traveled section of highway in Tennessee, with an annual average daily traffic (AADT) volume of more than 210,000 vehicles.About later, at an interchange with the western terminus of I-640, the northern bypass around downtown Knoxville, I-75 splits north off of I-40 and onto a concurrency with I-640.Along this concurrency, exits are numbered according to I-640 mileage.