The I-285/SR 400 Interchange Improvement Project will improve 4.3 miles of I-285 from west of Roswell Road to east of Ashford-Dunwoody Road and 6.2 miles along SR400 highway from the Glenridge Connector to Spalding Drive.

The Improvements include eastbound and westbound collector-distributor lanes on I-285 and northbound and southbound collector-distributer lanes on SR 400.