The Georgia Department of Transportation (GDOT) has announced that heavy construction activities for the SR 400 Express Lanes project are expected to begin in April 2026, including portions within Forsyth County.

According to GDOT, initial construction in Forsyth County will take place along SR 400 between McGinnis Ferry Road (future Exit 11B) and McFarland Parkway (Exit 12).

As construction begins and ramps up, GDOT advises that residents, commuters and community partners can expect to see increased activity in the corridor, including:

• Construction equipment mobilizing
• Work zones being established
• Phased traffic shifts
• Increased field activity as contractors begin heavy construction

This work is part of a larger 16-mile project corridor, with construction occurring in segments over time (see chart from GDOT below).

GDOT will continue to provide updates to help residents and motorists plan ahead as the project progresses. Residents are encouraged to stay alert when traveling through work zones and to plan for potential changes in traffic patterns as construction begins.

As construction advances on the SR 400 Express Lanes Project, GDOT has also announced a new SR 400 Incident Response Unit (IRU), which will begin operating along the 16-mile project corridor with patrols expected to start in April. GDOT states the IRU is being implemented to enhance roadway safety, improve traffic flow and support motorists throughout construction and future lane operations. The unit is designed to provide corridor-specific coverage and will complement GDOT’s existing Highway Emergency Response Operators (HERO) program.

According to GDOT, the SR 400 IRU will operate 24 hours a day, seven days a week, assisting motorists, removing roadway debris, supporting emergency responders and helping manage traffic during incidents. GDOT expects the unit to reduce response times and improve safety for both drivers and first responders while helping maintain reliable travel along this heavily traveled corridor.

For additional updates on the SR 400 Express Lanes project, visit GDOT’s project page at www.400expresslanes.com or sign up for traffic impact alerts and the project newsletter here.