Georgia 400 Expansion Begins, Promising Relief for Commuters

The $4.16 billion project will add toll and express lanes along a 16-mile stretch of the busy corridor.

Published on Mar. 10, 2026

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Construction has officially begun on a massive expansion of Georgia 400, a $4.16 billion project that will add toll and express lanes along a 16-mile stretch of the corridor. The project is expected to take five years to complete and is the largest transportation infrastructure project in Georgia's history.

Why it matters

The Georgia 400 corridor serves rapidly growing communities like Alpharetta, where population growth, major job centers, and new developments have increased traffic flows. The highway expansion is necessary to keep up with the region's growth and provide commuters with more reliable and efficient travel options.

The details

The expansion runs from south of Spalding Drive and the North Springs MARTA station in Fulton County to just north of McFarland Parkway in Forsyth County. In total, the corridor will include nine express lane connections designed to move traffic more efficiently through one of the fastest-growing parts of the state.

  • Construction has officially begun this week.
  • The project is expected to be completed in 2031.

The players

Georgia Department of Transportation

The state agency overseeing the Georgia 400 expansion project.

John Robison

Alpharetta's assistant city administrator, who says the highway expansion is necessary to keep up with the city's growth.

Kyle Collins

A representative from the Georgia Department of Transportation, who acknowledges that the construction will cause temporary disruptions for drivers.

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What they’re saying

“This is really about capacity, safety and reliability.”

— Georgia Department of Transportation (cbsnews.com)

“We're excited about this opportunity. We're appreciative of GDOT taking this on. Long term, I do think it's going to help a lot for those who live here, work here and the many who come to visit.”

— John Robison, Alpharetta Assistant City Administrator (cbsnews.com)

“There will be some temporary headaches, no doubt. Anyone who's familiar with metro Atlanta knows construction barrels can be frustrating, but this shows the commitment the department has made to improve safety, manage trip times and build for the future.”

— Kyle Collins, Georgia Department of Transportation (cbsnews.com)

What’s next

Transportation officials say they plan to do most of the construction work overnight to limit the impact on rush-hour commuters, but drivers should still expect disruptions in the form of lane closures, shifting traffic patterns, and work zones throughout the corridor.

The takeaway

The Georgia 400 expansion project reflects the challenge of managing rapid growth in the Atlanta metro area while preserving quality of life for residents. The five-year construction process will require patience and planning from both officials and commuters, but the end result is expected to provide long-term relief for one of the region's busiest transportation corridors.