FlatironDragados is pleased to break ground on the SR 400 Express Lanes project as part of the SR 400 Peach Partners consortium. ACS Group issued the following news release on behalf of the ACS Group companies.
ACS Group companies, ACS Infra (IRIDIUM) and FlatironDragados, today joined the Georgia Department of Transportation (GDOT), the Georgia State Road and Tollway Authority (SRTA), other project partners and key stakeholders to break ground on the SR 400 Express Lanes project.
Delivered under the SR 400 Peach Partners consortium, the 16-mile (25.75-kilometer) managed lanes public-private partnership (P3) will expand capacity along SR 400 from the North Springs Metropolitan Atlanta Rapid Transit Authority (MARTA) Station in Fulton County to McFarland Parkway in Forsyth County, improving travel reliability, enhancing safety, and supporting continued economic growth in metro Atlanta.
SR 400 Peach Partners—comprised of ACS Infra (IRIDIUM), Acciona, and Meridiam as developer and equity sponsors—will deliver the project in partnership with GDOT and SRTA under a long-term P3 agreement. FlatironDragados and Acciona will lead the construction, with Parsons serving as the lead design engineer. The project represents a key component of Georgia’s Major Mobility Investment Program (MMIP) and the first revenue-risk procurement under the program.
“This groundbreaking marks an important milestone for one of Georgia’s most critical transportation corridors,” said Steve DeWitt, CEO of ACS Infra. “In partnership with GDOT and SRTA, we are proud to deliver a project that will provide long-term mobility benefits, support economic growth, and improve the daily travel experience for the communities along SR 400 and the greater Atlanta metropolitan area.”
“As we enter the construction phase, we’re proud to continue our close collaboration with GDOT and our joint-venture partners on this vital investment,” said Javier Sevilla, CEO of FlatironDragados. “This complex initiative will generate significant employment opportunities and drive sustained economic and business growth across the region.”
SR 400 Express Lanes Project
With a total investment of approximately $10.8 billion and a concession term exceeding 55 years, including a 5.5-year construction period and 50 years of toll operations, the SR 400 Express Lanes project will feature dynamically priced express lanes in each direction, giving drivers a reliable travel-time option while maintaining free access to existing general-purpose lanes. The project will further enhance connections with the SR 400/I-285 interchange, new bridges, and corridor-wide technology systems designed to optimize traffic flow and improve safety. While enhancing travel reliability for drivers, the project will also support existing MARTA connections and future bus rapid transit improvements along the corridor.
The project’s financing structure combines federal credit assistance through a TIFIA loan and tax-exempt private activity bonds (PABs), with committed equity investment, providing a strong foundation for delivery of this critical investment. Construction will advance in phases across the corridor, with major field activity beginning this spring.
Construction is expected to result in significant job creation and related economic activity throughout the region. The project will also create numerous opportunities for local contractors, suppliers, and workforce participation across the corridor. Once complete, the project will improve corridor performance, reduce congestion, and strengthen connectivity between key employment centers, residential communities, and transit hubs, including MARTA.
The SR 400 Express Lanes project has already received industry recognition for its innovative financial structure, earning both IJGlobal North America Transport Deal of the Year and PFI Americas Infrastructure Deal of the Year honors.
Explore job opportunities at the SR 400 Express Lanes project.
About ACS Group
The ACS Group is a global, integrated, and diverse organization that develops, invests in, designs, constructs, and operates projects in next-generation mobility, advanced technology, energy transition, critical minerals, natural resources, social infrastructure, and large-scale civil engineering.
The Group has more than 150,000 employees worldwide with revenue of €49.9 billion in 2025. Our global network gives us scale and coverage to mobilize resources quickly and efficiently for clients, provide fulfilling careers for our people, and make long-term investments in innovation and research. We have deep understanding of our markets, long-standing relationships in our communities, and unrivalled technical expertise that delivers solutions for our clients. In 2025, ACS Group was ranked #1 on ENR’s Top 250 International Contractors list.
ACS Group companies include ACS Infra, a global leader in the development, financing, and long-term operations and maintenance of infrastructure projects in North America, and FlatironDragados, the trusted partner headquartered in Atlanta delivering resilient, innovative, and sustainable infrastructure for today and tomorrow. Additionally, FlatironDragados is the second largest civil engineering and construction firm in North America.