Georgia State Route 400

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State Route 400 marker

State Route 400
Map of northern Georgia with SR 400 highlighted in red
Route information
Maintained by GDOT
Length53.70 mi[1] (86.42 km)
Existed1971, 1993–present
Major junctions
South end I-85 in Buckhead
North end US 19 / SR 60 / SR 115 south-southeast of Dahlonega
CountiesFulton, Forsyth, Dawson, Lumpkin
Highway system
  • Georgia State Routes
SR 388SR 401

Georgia State Route 400 (officially "SR 400", and 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) until its 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 Interstate 85 (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 (which were renumbered by GDOT in 2000), the exit numbers are not mileage-based, they are sequential. Once SR 400 passes exit 17 (SR 306), it changes from a limited-access freeway into an at-grade divided highway with traffic lights, but still with a high 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". SR 400 is nicknamed locally as the "Alpharetta Autobahn" due to the prevalence of speeding.

Route description[edit]

Passing through the Atlanta Financial Center in Buckhead on SR 400 southbound

SR 400 begins at I-85 just north of Downtown Atlanta, goes through Buckhead, then has an interchange with I-285 before heading north into the northern Atlanta suburbs. The freeway section ends at SR 306 and SR 400 continues as a surface road until reaching its end at US 19/SR 60/SR 115.[1]

All of SR 400 south of the Dawson–Lumpkin county line is included as part of the National Highway System, a system of roadways important to the nation's economy, defense, and mobility.[2]

Exits on the controlled access part of SR 400 are numbered according to the consecutive numbering system instead of reference post (i.e. mile-based) numbering. This is unlike the Interstates in Georgia, which have used reference post numbering since 2000. This means that exit numbers on SR 400 start at 1 and use consecutive numbers (2, 3, 4, etc.) regardless of the nearest mile marker.

At the south terminus, new ramps connecting SR 400 south to I-85 north and I-85 south to SR 400 north opened on April 2, 2014.[3] The project was two years in the making and was paid for with funds from the SR 400 toll plaza. Prior, drivers had to exit off SR 400 onto Sidney Marcus Boulevard to get to I-85 north. On I-85 south, drivers had to take the Cheshire Bride Road/Lenox Road exit to get to Sidney Marcus Boulevard for access onto SR 400 north. The ramp from I-85 south is shared with the SR 13 ramp (exit 86). From SR 400, Sidney Marcus Boulevard is now exit 1B and the ramp to I-85 north is 1A.

In Forsyth County in 2017-2018, SR 400 was expanded from two lanes to three from McFarland Parkway to SR 369 (which is planned to be exit 18).


Original portion (I-285 to SR 306)[edit]

Southbound lanes of 400 north of Pitts Road overpass

Planning for the freeway, later known as the North Fulton Expressway, began in 1954.[4] The initial section north of I-285 was officially dedicated on May 24, 1971[5] and subsequent additions to the north opened in stages through 1981. The road was subsequently widened in 1989 from its original four-lane configuration to eight lanes between I-285 and Holcomb Bridge Road. The widening projects were brought on by the massive growth that the freeway brought to northern Fulton and southern Forsyth counties.

In December 2005, the Georgia Department of Transportation began widening the section from Holcomb Bridge Road to Windward Parkway from three to four lanes in the northbound direction and from two to four lanes from Windward Parkway to McFarland Parkway. Southbound, the highway was being widened to four lanes between McFarland Parkway and Holcomb Bridge Road. In addition, metal noise barrier walls and a concrete divider in the median were also added. Unlike the tollway section, no space was left for future extension of MARTA rail lines, despite there being no other adjacent rail corridor as most of the region's other areas have, and the fact that north Fulton is the only large densely populated area within MARTA's district remaining without rail service. However, there is ample land on either side of the freeway left undeveloped as a buffer zone that can be used for rapid transit in the future, as proposed by MARTA's Connect400 initiative.

In 2010, a half-diamond interchange (exit 4C) was added on the north side of Hammond Drive, allowing southbound exits and northbound entrances.

Freeway revolt[edit]

At one time, SR 400 was to connect to I-675 in southeast DeKalb county. However, residents in intown Atlanta neighborhoods did not want the highway to cut through and partially destroy their neighborhoods (as had occurred in Sweet Auburn and other neighborhoods), and a freeway revolt ensued, ending when then-Governor Jimmy Carter signed a new city charter and the USDOT rejected the highway studies in 1973, and George Busbee had the plan officially terminated when he became governor in 1975. The point where this road would have had its interchange with the also-doomed I-485 (now Freedom Parkway and SR 10 to Stone Mountain Freeway) is now the site of the Jimmy Carter Library and Museum. A later routing of I-485 would have had that number running from the Downtown Connector east to the current library, then north on what is now SR 400.

A revival of the connection to I-675 was proposed in 2009. A tunnel would go under East Atlanta and other neighborhoods in Atlanta on the DeKalb-county side, south to I-20. A surface road through less-developed land would then go south to I-675. The project would be a public/private initiative.[needs update]

Tollway extension (I-85 to I-285)[edit]

Toll booth on southbound Georgia 400

The northern portion of the inside-the-Perimeter route remained alive following the freeway revolts, and after lawsuits by residents that spent several years in court, GDOT was able to force the extension through Buckhead. Dozens of homes were taken through eminent domain or the threat of it, and the highway was built through the middle of formerly-secluded and forested neighborhoods. Some remaining residents live on dead end streets with metal barrier walls.

During planning stages of the highway in 1984, the Robinson-Humphrey Bank Company proposed a massive expansion of its office building in Buckhead, now known as the Atlanta Financial Center, which was to be built directly in the proposed routing of the highway. A compromise was worked out for Fulton County to pay $3 million to Robinson-Humphrey to offset extra construction costs. This allowed the new tower to be constructed with special concrete supports allowing for the highway and eventual MARTA Red Line to run underneath; the deal also covered Robinson-Humphrey's $1 million donation of the right-of-way to the Georgia DOT.[6] Construction of the massive tunnel underneath the office complex and its parking garage was underway in 1990; the tunnel was sealed off with concrete to protect the building from noise and vibration.

The road opened to traffic on August 1, 1993, after three years of construction. Existing exits were renumbered up by four to accommodate the extension, which had a single toll plaza in the middle of its length when opened. Contrary to public belief, the bonds that funded the construction of the tollway south of I-285 were not paid off until 2011.

In addition, the North Line (now Red Line) for Atlanta's MARTA train system was constructed in the median from the Glenridge Connector to south of Lenox Road, and was opened on June 8, 1996, extending the line from Lenox Square mall north to Perimeter Mall, and connecting the Perimeter Center area to the rail system. That edge city largely developed due to its proximity to the 400/285 interchange.

When Georgia 400 was a toll road, the toll plaza, operated by the State Road and Tollway Authority (SRTA), collected 50¢ tolls in both the northbound and southbound directions. Each direction had two open-road toll lanes, which collected tolls at highway speeds using the Georgia Peach Pass electronic tag (formerly "Cruise Card"), and seven gated toll lanes that accepted cash. The toll facility handled a total of approximately 120,000 vehicles per day. About 37% of transactions were paid via Peach Pass, the same technology also used by SunPass in Florida, Quick Pass in North Carolina, TxTag in Texas, and PikePass in Oklahoma. Peach Pass can be used interchangeably with the Florida and North Carolina systems and passes, but not with TxTag and PikePass, due to a lack of reciprocal billing arrangements with those non-adjacent states.

SR 400 was the only active toll road in Georgia, after the Torras Causeway toll between Brunswick and St. Simons Island on the southeastern Georgia coast was removed in 2003,[7] until the high occupancy toll express lanes opened on I-85 in 2011. The SR 400 toll was to expire in 2011 after 20 years. However, Sonny Perdue and members of the State Road and Tollway Authority (SRTA) voted on September 24, 2010 to keep the tolls on until 2020. The 10-year extension was to fund 11 new projects on the highway.[8]

In March 2009, local TV news reports brought up an issue regarding tolls on the road, since SRTA reported that enough money has been collected to pay the bonds used to construct the road (though prepayment prior to 2011 was prohibited). Despite promises that the toll would be removed once the road was paid for, the tolls continued to be collected. The road costs $2 million per year just to maintain (plus occasional repaving), and it cost several million more for the demolition of the toll plaza. (One option would have been to simply close the toll plaza, allowing drivers to pass through without paying.) Without the revenue from it, the state must raise money through taxes for new road projects, such as the reconstruction of the interchange at I-285, expected to cost $2 billion. On July 19, 2012, Governor Nathan Deal announced that despite this, the toll barrier would be removed by the end of 2013.[9] Originally scheduled for the end of November, it was advanced to the weekend before the heavy travel of the Thanksgiving holiday.

Direct access from SR 400 southbound to I-85 northbound (and the reverse direction) opened in April 2014, ending the need to take the indirect route via Sidney Marcus Boulevard. In June 2015, a ceremony was held to name the flyover bridges for Captain Herb Emory, a beloved local traffic reporter for WSB AM and WSB-TV (as well as other co-owned stations) who had also died in April 2014.[10]


Tolling was discontinued on November 22, 2013 at 11:08 am; the last toll was collected by Governor Nathan Deal and was paid by the same couple that paid the first toll in 1993. The toll plaza was removed in a four-phase demolition project.[11]

The toll plaza was located north of Lenox Road (exit 2). Tolls were formerly collected in both directions. The toll was $0.50 for a two-axle vehicle, $1.50 for three axles, plus $0.50 for each additional axle. In July 2012, two weeks before voters of Georgia voted on the Transportation Referendum act, Governor Deal said that the toll on SR 400 would be abandoned in November 2013, meaning that, at the beginning of 2014, SR 400 would be a toll-free road.

In 2012, a feasibility study was initiated by the Georgia Department of Transportation to explore the possibility of adding tolled express lanes.[12] The proposed express lanes would be 24 miles (39 km) long, and mirror the existing lanes on I-85. The lanes' southern terminus will be I-285 in Sandy Springs, and their northern terminus would be SR 20 in Cumming. Fees would be similar to the existing I-85 lanes, and will be paid using Peach Pass, making the express lanes compatible with the existing express lanes on I-85 (as well as the former toll plaza in Buckhead if it had remained in operation).

Movie filming[edit]

Several scenes from the movie Smokey and the Bandit were filmed on SR 400. The "Alabama" police chase where the Bandit hides in a convoy of trucks actually takes place on SR 400 between exit 12 and exit 14 in Cumming.

Exit list[edit]

SR 400's northern terminus in Lumpkin County
FultonAtlanta0.00.01A I-85 (SR 403) – Downtown Atlanta, Atlanta Airport, GreenvilleSouthern terminus
0.60.971BSidney Marcus BoulevardSouthbound exit and northbound entrance only
2.84.52 SR 141 Conn. (Lenox Road)Single-point urban interchange
4.16.6Toll plaza (demolished 2014)
Sandy Springs6.610.63Glenridge Perimeter ConnectorNorthbound exit via exit 4A; former SR 407 Loop
6.810.94 I-285 (Atlanta Bypass / SR 407) / US 19 south – GreenvilleSouthern end of US 19 concurrency; signed as exits 4A (east) and 4B (west)
7.411.94CHammond Drive – Dunwoody, Sandy SpringsSouthbound exit and northbound entrance only; scheduled to be part of exit 5 at conclusion of I-285–SR 400 interchange project
8.413.55Abernathy Road – Dunwoody, Sandy SpringsNorthbound exits signed as exits 5A (east) and 5B (west)
10.016.15C North Springs MARTA stationSouthbound exit and northbound entrance only; scheduled to be part of exit 5 at conclusion of I-285–SR 400 interchange project
12.019.36Northridge RoadMayor Eva Cohn Galambos Memorial Interchange[13]
Roswell15.024.17 SR 140 (Holcomb Bridge Road) – Roswell, Peachtree CornersNorthbound exit signed as exits 7A (east) Peachtree Corners and 7B (west) Roswell; Southbound exit signed only as Roswell
Alpharetta16.426.48Mansell Road
18.329.59Haynes Bridge Road
19.631.510 SR 120 (Old Milton Parkway) – Alpharetta
21.033.811Windward Parkway
Forsyth22.436.011BMcGinnis Ferry RoadExit currently being built, completion is scheduled for 2024[14]
23.838.312McFarland ParkwayNorthbound exit signed as exits 12A (east) and 12B (west)
284513 SR 141 (Peachtree Parkway) – Cumming, Norcross
30.849.614 SR 20 – Cumming, Sugar Hill, BufordNorthbound exit signed as exits 14A (east) and 14B (west)
Cumming32.852.815Bald Ridge Marina Road
34.755.816Pilgrim Mill Road
36.358.417 SR 306 (Keith Bridge Road) – Cumming, Gainesville
37.259.918 SR 369 (Browns Bridge Road)Planned conversion from intersection to interchange[14]
37.460.2North end of freeway
DawsonDawsonville44.972.3 SR 53
47.876.9 SR 136
Lumpkin53.786.4 US 19 north / SR 60 / SR 115Northern terminus; northern end of US 19 concurrency
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also[edit]



  1. ^ a b c Google (October 31, 2012). "GA-400" (Map). Google Maps. Google. Retrieved October 31, 2012.
  2. ^ "National Highway System: Atlanta, GA" (PDF). United States Department of Transportation. October 1, 2012. Retrieved September 14, 2013.
  3. ^ "Flyover ramp connecting Ga. 400 to I-85 opens". April 2, 2014. Retrieved March 31, 2017.
  4. ^ "Historic Preservation Element". November 7, 2005. Archived from the original (PDF) on September 24, 2015. Retrieved September 14, 2013.
  5. ^ Walsh, Darlene M., ed. (1994). Roswell: A Pictorial History (2nd ed.). p. 150. ISBN 0-9615854-2-0.
  6. ^ Beasley, David (May 13, 1990). "Ga. 400 digs in at high-rise". Atlanta Journal-Constitution. Retrieved February 22, 2017.
  7. ^ "Governor Perdue and Georgia DOT Announce Elimination of Torras Causeway Toll" (Press release). September 12, 2003. Retrieved September 14, 2013.
  8. ^ "Ga. 400 Toll Will Remain Until 2020". Atlanta, GA: WSB-TV. September 24, 2010. Retrieved September 14, 2013.
  9. ^ "Governor to remove Ga. 400 toll barriers". Atlanta, GA: WSB-TV. July 19, 2012. Retrieved July 19, 2012.
  10. ^ EndPlay. "GA-400 flyover named for Capt. Herb Emory". WSB-TV. Retrieved March 31, 2017.
  11. ^ Parrish, Sandra (November 22, 2013). "Deal fulfills promise to end tolls on GA 400". WSB Radio. Retrieved November 22, 2013.
  12. ^ "GA 400 Express Lanes". Georgia Department of Transportation. Archived from the original on September 7, 2013. Retrieved September 14, 2013.
  13. ^ "House Resolution 1052 (AS PASSED HOUSE AND SENATE)" (PDF). Georgia General Assembly Legislation. Retrieved February 14, 2019.
  14. ^ a b "Highlights from the Forsyth County Transportation Summit". February 23, 2018.

External links[edit]

Route map:

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