Madge -Can't believe you prefer Atlanta traffic over Nashville. I've driven in Nashville traffic for years and it doesn't phase me... Atlanta usually puts me into white knuckle mode.
CBRfan -I always drive straight thru Atlanta, but after getting caught once in Friday afternoon traffic (which lasts from 4 til at least 7), I try to avoid morning or afternoon rush hours during the week, and especially on Friday! And taking the bypass at that time doesn't seem to make much difference. Check schedule on sporting events held downtown, also, if you're going thru town.