I’ve never been to the state of Georgia, but I was under the impression that both Atlanta and Savannah had pretty good public transit systems. Atlanta has a metro system (MARTA) which is the eight largest in the USA by ridership. And Savannah has an extensive bus network, and a walkable downtown area where transit is actually free to ride.
I just spent 7 weeks traveling around Europe by train. I would not have considered that approach without the extensive local public transportation systems. Atlanta is not remotely in the same league as Berlin in terms of public transit.