Officials with the Atlanta area's public transit system are studying the idea of expanding the service further north into the metro area's sprawling northern suburbs.

The Metropolitan Atlanta Rapid Transit Authority will hold a public meeting about the concept on Sept. 26 at Alpharetta City Hall.

Several ideas are being explored, including adding buses, light rail or heavy rail along a 12-mile stretch of Georgia 400 from Dunwoody to Alpharetta.

Details about the cost and potential ridership of the proposed expansion were not available Thursday. However, officials said those figures would be presented at the public hearing.

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