A major infrastructure overhaul is underway in Georgia as FlatironDragados and Acciona have officially broken ground on the State Route 400 Express Lanes project, a multibillion-dollar effort aimed at improving mobility in the Atlanta metro region.
The project, led by the Georgia Department of Transportation, will transform approximately 16 miles of State Route 400 by adding new capacity and dynamically priced express lanes. While total investment for the broader initiative is estimated at $10.8 billion, construction costs for this segment are pegged at $4.6 billion.
The groundbreaking aligns with the agency’s previously announced timeline, which targeted an April construction start.
The Georgia DOT selected SR 400 Peach Partners — a joint venture that includes ACS Infrastructure, Acciona and Meridiam — as the design-build team under a public-private partnership model. The initiative is a key component of the state’s broader strategy to modernize transportation corridors and accommodate population growth.
Construction will extend from a transit station in Fulton County to McFarland Parkway in Forsyth County, creating express lanes in both directions designed to ease congestion and provide commuters with faster travel options.
In addition to lane expansion, the project will enhance connectivity at the Interstate 285 and SR 400 interchange, one of the busiest junctions in the Atlanta area. Improvements build on earlier work completed by Ferrovial, which delivered a $690 million upgrade to the interchange in 2025.
The project scope also includes the construction of new bridges and the deployment of corridor-wide technology systems aimed at improving traffic flow and safety. These upgrades are expected to modernize the corridor while addressing long-standing congestion challenges.
Funding for the project includes a loan from the Transportation Infrastructure Finance and Innovation Act (TIFIA) program, which provides federal credit assistance for large-scale infrastructure initiatives and can cover up to 49% of eligible costs. Additional financing comes from tax-exempt private activity bonds.
The SR 400 Express Lanes project is part of Georgia’s Major Mobility Investment Program, a statewide effort to upgrade key transportation routes and support long-term economic growth.
Once complete, the improvements are expected to provide more reliable travel times for commuters and enhance freight movement through one of the region’s most heavily traveled corridors.
Originally reported by Matthew Thibault, Reporter in Construction Dive.
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