If you did not get to ask your question or submit your comment last night, here is the person to contact at TDOT:

Michael W. Russell, P.E.
TDOT
7345 Region Lane
Knoxville, TN 37914

or

P.O. Box 58
Knoxville, TN 37901

Phone: 865.594.2334
Email: Mike.Russell@state.tn.us [1]