Georgia State Route 400

Georgia State Route 400 (always known locally as Georgia 400 or by its nickname, the "Alpharetta Autobahn") is a highway in the U.S. state of Georgia, muliplexed with U.S. 19 from exit 4B until its terminus just south of Dahlonega. Georgia 400 goes from Atlanta, at I-85, to Buckhead, Sandy Springs, Roswell, Alpharetta, Forsyth County, Dawson County, and Dahlonega. Like the interstate highways, it is a limited access road (with exit ramps instead of intersections), but unlike the interstates (which were renumbered by the GDOT in 2000), the exit numbers do not indicate mileage: they still go up sequentially one-by-one. Once 400 passes exit 17 (S.R. 306), it changes from a limited access highway into an at-grade divided highway.

Related Topics:
Alpharetta - Autobahn - Highway - U.S. state - Georgia - U.S. 19 - Dahlonega - Atlanta - I-85 - Buckhead - Sandy Springs - Roswell - Forsyth County - Dawson County - Interstate highway - Exit ramp - Intersection - GDOT - 2000 - Mileage - Sequential

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Between Interstate 85 and Interstate 285, Georgia 400 is designated "T. Harvey Mathis Parkway"; upon reaching the Perimeter and beyond, the highway is designated "Turner McDonald Parkway".

Related Topics:
Interstate 285 - The Perimeter

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The section north of I-285 opened in various stages from 1968 to 1981 and was subsequently widened from its original four lane configuration to eight lanes between I-285 and Holcomb Bridge Road. The widening projects were necessitated by the massive growth that Georgia 400 brought to northern Fulton County and Forsyth County. However, even the widened road has failed to prevent traffic jams during the weekday rush hour.

Related Topics:
1968 - 1981

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The southern section of Georgia 400 (from I-285 to I-85) was built last, and is currently the only toll road remaining in Georgia. Opened to traffic on August 1, 1993, this section was fought bitterly by Buckhead residents, who eventually ended up having their homes and large parts of their neighborhoods destroyed for the construction. Many remaining residents now live on dead end streets with significant noise pollution. Existing exits were renumbered up by four to accommodate the extension, which has a single toll booth in the middle of its length, accepting change or cruise cards. There is also currently no way to go from 400 south to 85 north or vice versa, except by a confusing route via Sidney Marcus Boulevard. In addition, the North Line for Atlanta's MARTA system was constructed in the median from the Glenridge Connector to south of Lenox Road and was opened on June 8, 1996.

Related Topics:
Toll - Home - Neighborhood - Construction - Dead end - Noise pollution - Toll booth - Change - Cruise card - Vice versa - Sidney Marcus - MARTA

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At one time, Georgia 400 was to connect to Interstate 675 in DeKalb County; however, residents in northern DeKalb County did not want the highway to cut through their neighborhoods and had the idea killed.

Related Topics:
Interstate 675 - DeKalb County

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