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Overturned truck closes Ga. 400 southbound lanes for hours
Police lights

UPDATE, 4:50 p.m.: The southbound lanes have reopened. 

UPDATE, 3:45 p.m.: Two lanes of Ga. 400 southbound have reopened after an overturned tractor-trailer "has been returned to a full and upright position," according to the Alpharetta Department of Public Safety. 
Crews are working to completely open the road, which officials said should open soon. 

A portion of Ga. 400 is closed due to an overturned tractor-trailer.

According to a news release from the Alpharetta Department of Public Safety, all of Ga. 400's southbound lanes are closed between McGinnis Ferry Road and Windward Parkway due to the crash.

Drivers are advised to take Exit 12 at McFarland Parkway to avoid the area.

This story will be updated.