Interstate 420 in Georgia
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| Maintained by GDOT | ||||||||||||
| Length: | 63 mi (102 km) | |||||||||||
| Existed: | 1940 – present | |||||||||||
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| West end: |
 SR 46 at the Alabama state line west of Bowdon
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    US 27 / SR 1 / US 27 Alt. / SR 16 in Carrollton I‑285 in Atlanta  US 29 / SR 154 in East Point  I‑75 / I‑85 in Atlanta |
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| East end: | Lakewood Avenue, southeast Atlanta | |||||||||||
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| Counties: | Carroll, Douglas, Fulton | |||||||||||
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| Location: | Atlanta |
| Length: | 5.40 mi (8.69 km) |
| Existed: | 1983–1986 |
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| Location: | Carrollton |
| Length: | 3.7 mi (6.0 km) |
| Existed: | 2004– |
State Route 166 (SR 166) is a state highway in the U.S. state of Georgia. It connects the Alabama state line with the city of Atlanta. The highway travels through Carrollton, McWhorter, and East Point. Except for the Carrollton and East Point/Atlanta areas, the highway is fairly rural. In Atlanta, it has a limited-access freeway portion that is known as the Arthur B. Langford Jr. Parkway (formerly named the Lakewood Freeway).
SR 166 was originally the Georgia segment of U.S. Route 78S (US 78S), which was later redesignated as US 78 Alt. The Lakewood Freeway portion of this highway was, at one time, slated to become designated as Interstate 420 (I-420), but that project was cancelled.
SR 166 begins at the Alabama state line, on the northeastern edge of Ranburne, Alabama, where the roadway continues as Alabama State Route 46 (Main Street). It travels to the northeast, through Carroll County. After curving to an east-northeast direction, and then beginning an east-southeast routing, it crosses over Big Indian Creek. The highway enters Bowdon and curves back to the east-northeast just before intersecting the northern terminus of Elm Street. Just to the east of Griffins Alley, it curves to a due-east direction and intersects SR 100 (Wedowee Street/North Carroll Street). Almost immediately, the highway travels to the northeast. After leaving the city limits of Bowdon, and just before an intersection with Dixson Road and West Jonesville Road, SR 166 begins to curve to an easterly direction. It passes just north of Anderson Lake shortly before crossing over the Little Tallapoosa River. Nearly 2 miles (3.2 km) later, it enters the city limits of Carrollton. At an intersection with Maple Street, which leads to downtown Carrollton, SR 166 turns to the right onto what is essentially a bypass of the main part of the city. It passes to the south of Sunset Hills Country Club and then reaches the Wayne Shackelford Interchange with US 27/SR 1/SR 16 (Martha Berry Highway). SR 166 continues to the east-northeast, concurrent with SR 16, as well as US 27 Alt., which begins at that interchange. The three highways curve to the northeast and travel to the southeast of Richards Lake. At an intersection with Newnan Road, US 27 Alt./SR 16 depart to the southeast, while SR 166 continues to the northeast. Just after Old Newnan Road, it curves to a due-north direction. Just to the east of Lake Carroll, it intersects the eastern terminus of SR 166 Conn. (Northside Drive). At this intersection, SR 166 turns to the right, traveling northeast on Bankhead Highway. At an intersection with the southern terminus of SR 61 (Carrollton-Villa Rica Highway), SR 166/Bankhead Highway turn right and resume their eastward trek. They weave through rural portions of the county. At the Douglas county line, the Bankhead Highway name ends and the J. Ebb Duncan Memorial Highway name begins.
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