Heading south on I-75 thru Atlanta

I lived in Atlanta for over 15 years. Rush "hour" is up until 10:00am and starts up shortly after 2:00pm. I would recommend as you approach Atlanta, get in the third lane from the "left" and stay there. The right hand lanes are continually dropping off and you have entering traffic to deal with. As you approach the junction of I85 as you approach downtown make sure you don't exit to I85 North. It is a left exit. You definitely don't want to take I285 around Atlanta for two reasons. It is a lot further than straight through and all of the 18 wheelers are on I285. They have to go around.

You will be fine, just pick your lane and stay in it.