Georgia State Route 166
SR 166; mainline in red, connector in blue | ||||||||||
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| Maintained by GDOT | ||||||||||
| Length | 63.4 mi (102.0 km) | |||||||||
| Existed | 1940–present | |||||||||
| Major junctions | ||||||||||
| West end | SR 46 at the Alabama state line west of Bowdon | |||||||||
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| East end | Lakewood Avenue in southeast Atlanta | |||||||||
| Location | ||||||||||
| Country | United States | |||||||||
| State | Georgia | |||||||||
| Counties | Carroll, Douglas, Fulton | |||||||||
| Highway system | ||||||||||
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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.