I was just tweaking the overlap of I-71 and I-75. Changing it from named as I-71 to I-75 since that is the primary route (I-71 splitting off at each end is a numbered exit).
I'm working in stages with named exits being last on my list. I've updated the naming of some exits to more closely match signs.
Just building upon the already great work you've done
As for highways, I am limited to roads I've actually driven. That does cover TN to places like NYC, Chicago, Richmond VA, Miami FL, so it is a loooong list of highways.