For Atlanta - North/South I-175 I-85 have a HOV lane - Motorcycles can ride in them.
On I-85 north of Atlanta and soon to be I-75 South of Atlanta - there is a Toll Road. You do not stop to pay a toll it’s automatic via a RFID chip I think. These are called peach pass lanes. For motorcycles - call the people at peachpass
http://www.peachpass.com Get a FREE Pass - Motorcycles DO NOT pay the toll. Main: 1-855-PCH-PASS (724-7277) Takes less than a week to get the pass. Just put it in your saddle bags.
Florida Sunpass and the North Carolina one is recognized too - not sure if you would get charged on your sunpass so get the Free GA Motorcycle peach pass.
If you do not register for free - you will get fined if you are in the toll lane.
Especially on the weekend - riding in the peach pass lane is like having your own lane on the interstate. Easiest way to take a group of bikes through downtown Atlanta on the weekend.