Georgia State Route 400
highway in Georgia
State Route 400 (SR 400; commonly known as Georgia 400) is a freeway and state highway in the U.S. state of Georgia serving parts of Metro Atlanta. It is concurrent with U.S. Route 19 (US 19) from exit 4 (Interstate 285 [I-285]) until its northern terminus south-southeast of Dahlonega, linking the city of Atlanta to its north-central suburbs and exurbs. SR 400 travels from the Lindbergh neighborhood in the Buckhead district of Atlanta, at I-85, to just south-southeast of Dahlonega. Like the Interstate Highways, it is a limited-access road (with interchanges instead of intersections), but unlike the Interstates, the exit numbers are not mileage-based, they are sequential. Once SR 400 passes exit 18 (SR 369), it changes from a limited-access freeway into an at-grade expressway with traffic lights, but still with a speed limit of 65 miles per hour (105 km/h), and ends at the J. B. Jones Intersection at SR 60/SR 115 in Lumpkin County.
Between I-85 and I-285, SR 400 is designated "T. Harvey Mathis Parkway", after a local land developer and road proponent who died the day after being appointed as head of the Atlanta Committee for the Olympic Games in June 1991, when the tollway was under construction. Upon reaching the Perimeter (I-285) and beyond, the highway is designated "Turner McDonald Parkway", after a Fulton County Public Works Department director.
SR 400 is one of only two state routes in the 400–499 series to not be designated as an unsigned route following an Interstate; the other is SR 410 near Stone Mountain. Both SR 400 and SR 410 were originally planned as interstate routes: SR 400 was supposed to be I-485 and SR 410 was supposed to be I-675.
Route description
SR 400 begins at I-85 just north of Downtown Atlanta.
The public source identifies “Georgia State Route 400” as highway in Georgia. This brief keeps that definition visible, then builds a research path around Georgia, State and Route.
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The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 15, 2026. The linked authority identifier is Q2428605. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1991.
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This entry incorporates text from “Georgia State Route 400” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.