Forsyth County warns of nightly lane closures on SR 400 northbound
Nightly SR 400 northbound lane closures near Exit 18 ran from 9 p.m. to 6 a.m. June 13-16, threatening delays for North Forsyth commuters and late-night business traffic.
Drivers headed north on SR 400 near Exit 18 faced overnight slowdowns from 9 p.m. to 6 a.m. as Forsyth County moved ahead with lane closures that began Tuesday, June 13 and continued through Friday, June 16. The work was aimed at overhead sign installation about one mile south of Exit 18, near SR 369, and county officials warned that traffic pacing, single-lane closures and double-lane closures could ripple through trips into Cumming, Coal Mountain and the rest of North Forsyth.
The timing matters because the affected stretch sits on one of the county’s most important commuter corridors. Anyone driving home after evening events, making late restaurant runs around Exit 18 or delivering goods into the area could feel the pinch, while early-morning commuters trying to clear the corridor before sunrise were among the most likely to run into delay. The county urged motorists to plan ahead and watch for lane shifts, since the road was not expected to shut down completely but could still back up when crews narrowed traffic.
The closures were the latest reminder that the Exit 18 area remains an active construction zone tied to the SR 369, or Browns Bridge Road, interchange at SR 400. A partial cloverleaf interchange replaced a signalized intersection there in April 2023, and the project is a joint effort between Forsyth County and the Georgia Department of Transportation. Funding has come from the Forsyth County Transportation Bond approved in 2014, SPLOST and GDOT money.
County project materials say the bridge remains structurally safe, but the Phase I westside support cap needs replacement after a layout error by the project’s subcontractor during initial construction. Baldwin Paving Co. is handling the replacement and has assumed financial responsibility for the extra work. County officials have said the modification and beam replacement are expected to take about nine months, followed by another estimated three months to finish the project and open all four lanes of traffic.
Forsyth County has kept the public updated through meetings and project notices, including a town hall and open house on Feb. 3, 2025, about the overpass work. The county also dedicated part of SR 369 as the Bobby Thomas Highway on June 26, 2024, and adopted its 2024 Comprehensive Transportation Plan on Aug. 1, 2024, part of a long-range effort to manage growth, traffic flow and safety across the county. For now, the clearest relief for drivers is simple: avoid the 9 p.m. to 6 a.m. window near Exit 18 when possible and expect the Georgia 400 corridor to remain a work zone as the interchange project moves forward.
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