Peg Leg wrote:
If it's feasible, I69 to Indy, I65 to Nashville then I24 to Chattanooga has less hills. You join back up with I75 at Choo Choo. For me there's only about 10 miles difference so it really doesn't matter, but I always go the I65 route.
If you want flatter than that stay on I 65 to Alabama and go through Dothan into Flordia. Did I mention that this way you also avoid Atlanta.
Peg Leg is correct in regard to a flatter route. Taking I-65 down to Montgomery, Alabama and catching US231 toward Dothan, AL and then taking I-10 eastward until US27/US19 or further east and I-75 before turning south.