Several yrs. back we drove back home from Savanah, Ga. going thru Atlanta and Nashville on a Sunday. We left early in the AM, got to Atlanta around 10, virtually no traffic and breezed thru to Nashville where traffic was moderate but not heavy.
I can't speak to evening hrs. in either one, but have gone thru during the week in both and it seemed there was never a good time.
If you are planning on taking either I75 or I65, you really, really should take a look at what the road construction along the way may be.Edited: 22 May 2018, 11:16