While MARTA does not extend into Gwinnett, you can connect with Gwinnett County Transit at the Doraville MARTA station at the end of the gold rail line. GCT Route 10 departs from the station and travels north on Buford Highway through Norcross, ending at the Gwinnett Transfer Center/Gwinnett Place Mall. The transfer center allows connections between all GCT routes.
There is also GRTA Express Route 410 that goes directly from the Lindbergh Center MARTA station to Sugarloaf Mills. And GRTA Express Route 412 goes to Discovery Mills from the Civic Center and Arts Center stations.
Transfers to/from MARTA are free — the Breeze Card can be used as payment on all area transit systems. To save time, request an Uber or Lyft car at the Doraville MARTA station or take one of the waiting taxis to your final destination.