I'm in Indiana and use I-24 and I-75 twice a yr. If it wasn't for the BIL living SW of Atlanta I'd be going through Alabama.
Northbound I get off of I-75 at Perry, GA. A hundred miles of 2 lane to the BIL's. Then cut over to US-27 which is mostly 4 lane. South of Rome I use Hwy 1 Loop to Hwy 20, then over to Ft Payne, AL. It's all 2 lane in Alabama and a very steep grade down into Ft Payne. I-59 back to I-24.
This isn't a feasible route for most, but visiting family makes it work for me. For me Nashville or Knoxville is only 10 miles difference but I have to make a couple of more family stops. I-75 has to many ups and downs, like a roller coaster. I know one guy that takes US-27 all the way from I-10 into Michigan. I guess it all comes down to your destination and how bad you want to avoid Atlanta. Personally I'll go 200 miles out my way to avoid Chicago.
I will not go through Chattanooga in the rain. Twice I've been north bound with the 5th wheel and had a car spin out in front of me on the last right hand curve down into the city. The last time I went between the car and his front bumper after he slid across in front of me and hit the inside wall. Water runs down the hill and then across the road as it banks for the turn. They hit the brakes for the hill, hit the water and hydroplane out of control.
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retired gadgetman