The MARTA Rapid Southlake project, the first bus rapid transit (BRT) system in Clayton County, will improve transit service within the County and provide regional connections to the Atlanta Metro Area. Rapid Southlake will operate primarily within the western, central section of Clayton County. The Locally Preferred Alternative (LPA) for this project includes an alignment between the MARTA College Park Station and Southlake Mall.

To expand access to jobs and make the project more competitive for federal funding, MARTA has studied the feasibility of a connection to the MARTA Airport Station at the Hartsfield-Jackson Atlanta International Airport Domestic Terminal. In December 2023, MARTA put forward the recommendation to Clayton County Board of Commissioners to consider an amended LPA with the project terminus at the airport instead of at College Park Station. An open house is being planned to solicit public input on the proposed alternative multimodal connection.

The project will provide service to Clayton County, Riverdale and Morrow with connections to key destinations including the Shops of Riverdale, Southlake Mall and the Southern Regional Medical Center. Rapid Southlake will be approximately 15 miles in length and run in dedicated right-of-way and mixed traffic on existing roadways.