GA 400 Construction Brings Overnight Lane Closures to Roswell and Alpharetta

Drivers traveling through North Fulton after dark will face another week of lane closures as construction intensifies on the Georgia 400 Express Lanes project.

The temporary closures are scheduled nightly from Monday, August 3, through Friday, August 7, generally between 9 p.m. and 5 a.m. Work is weather-dependent, and individual closure times or locations could change.

The most substantial restrictions will occur around Roswell and Alpharetta, where crews plan to close two lanes at a time along portions of the highway.

Southbound, the double-lane closure will extend from Mansell Road to Riverside Road. Northbound, two lanes will close between Mansell Road and Kimball Bridge Road.

Additional single-lane closures are planned in both directions between Roberts Drive and the North Springs MARTA station. One lane will also close near the southbound Holcomb Bridge Road exit.

The highway will remain open, but losing two lanes along heavily traveled sections could create meaningful backups, particularly earlier in the evening. Georgia transportation officials have not announced formal detour routes for the work.

Drivers heading south from Alpharetta or Roswell may consider entering Georgia 400 below the active construction area when practical. Those traveling north could use local roads to move beyond the affected section, although Holcomb Bridge Road, Alpharetta Highway and Old Alabama Road may also become busier as motorists leave the highway.

Closures arrive as school traffic returns

The timing adds another complication to the beginning of the school year.

Fulton County Schools students return Monday, bringing school buses, parent traffic and regular commuter patterns back to roads across Johns Creek, Alpharetta, Milton and Roswell. The district expects approximately 85,000 students at 101 schools during the 2026–27 academic year.

The Georgia 400 work is scheduled after the daytime commute, but residents attending evening activities, working late or returning from the airport may encounter slower travel just as the region settles back into its full fall routine.

Motorists should allow extra time, watch for shifting lane lines and avoid making sudden moves near construction vehicles and temporary barriers.

A five-year transformation of the corridor

The closures are part of a much larger project that will reshape approximately 16 miles of Georgia 400.

Plans call for two tolled express lanes in each direction between the North Springs MARTA station and McGinnis Ferry Road. Farther north, one express lane in each direction will continue from McGinnis Ferry to McFarland Parkway in South Forsyth.

The lanes will operate through the Peach Pass system, with tolls changing according to traffic conditions. General-purpose lanes will remain available without a toll.

The project also includes future bus rapid-transit service linking North Springs with stops at Holcomb Bridge Road, North Point and the Windward Parkway park-and-ride area. Georgia transportation officials expect the completed express lanes to open in 2031.

Construction officially entered its heavier phase this year, and overnight closures are likely to become a recurring feature along the corridor. Georgia DOT says work may occur during both daytime and nighttime hours, with the most disruptive lane restrictions typically scheduled between 9 p.m. and 5 a.m. to reduce interference with daytime traffic.

For North Fulton drivers, this week’s closures are therefore less a single interruption than an early indication of the conditions likely to accompany the project during the next several years.

Current road conditions and last-minute changes can be checked through Georgia’s official 511 traffic service before departure.