Heavy construction on the GA-400 express lanes project is set to begin in July 2026, and Roswell businesses along the Holcomb Bridge Road corridor are already seeing the ground shift. Tree clearing, a new bus shelter, and fresh MARTA stops signal what's coming: a dedicated bus rapid transit station at Holcomb Bridge, dynamically priced toll lanes, and improved interchange access by 2031.
The project adds 16 miles of express lanes from the North Springs MARTA Station to McFarland Parkway in Forsyth County, running directly through Roswell's commercial spine. According to GDOT's project fact sheet, the total investment is approximately $11 billion over a 50-year public-private partnership with SR 400 Peach Partners, with construction costs estimated at $4.6 billion.
GDOT estimates express lane users will see up to 30% faster peak-hour travel compared to general-purpose lanes, according to a traffic analysis completed for the project. Tolls will use the existing Peach Pass system, with prices adjusting based on traffic volume. Transit buses and registered vanpools will use the lanes toll-free.
What's already visible in Roswell
Tree clearing has reshaped the landscape at Mansell Road and Holcomb Bridge Road. GDOT P3 Project Manager Kyle Collins told Appen Media in November 2025 that crews cleared those areas first because "those locations fall in the project areas where construction will begin soonest." Collins said lane closures during construction will not occur on major holidays or high-traffic periods, and weekly traffic updates will be posted on the project website.
True North 400, the community improvement district serving the SR 400 corridor, installed a new bus shelter at Holcomb Bridge Road in April 2026 as part of its Bus Shelter Program with the City of Roswell. MARTA launched its redesigned NextGen Bus Network on April 18, adding stops near Roswell Market Place, Kroger, and Mansell West Office Park along the corridor, according to the City of Roswell.
Transit and workforce access
A planned MARTA BRT station at Holcomb Bridge Road will connect to the express lane transit system, giving workers and shoppers access to the managed lanes without paying tolls. They'll still pay standard MARTA fares, but the BRT service bypasses general-purpose congestion entirely.
True North 400 secured a $2 million grant from the Atlanta-Region Transit Link Authority in December 2025 to design first-and-last-mile connections to those future stations. The funding will advance conceptual design and preliminary engineering for multimodal access to the proposed station areas.
Roswell Inc, the city's economic development organization, attended the April 22 groundbreaking at Avalon and cited projections of 19,000 fewer hours of commuter delay per day across the corridor. The organization said more access points and streamlined express lanes will make Roswell "an even more attractive destination for businesses" by improving workforce access to jobs across North Fulton.
GDOT says it will use sound walls, dust control, and traffic management plans during construction to limit disruption to nearby businesses and neighborhoods.
Residents can sign up for construction alerts and traffic updates at 400expresslanes.com.
