 
Georgia 166 - Langford Parkway (Planned Interstate 420)
Georgia 166 constitutes the east-west Langford Parkway between Interstate 285 and Lakewood Avenue. This freeway carries four lanes and a brief overlap with Georgia 154. The Atlanta and East Point highway transitions into Campbellton Road west of the Perimeter Highway. Georgia 166 follows this roadway westward to Douglasville.
Unconstructed Interstate 420
Beginning at the Alabama-Georgia State Line west of Jonesville, Georgia 166 heads east through Carollton en route to Atlanta. Upon crossing Interstate 285, Georgia 166 (and cosigned Georgia 154) widens to a four-lane freeway. Georgia 166 ends at its interchange with Interstate 75 south of downtown Atlanta. Originally known as the Lakewood Freeway, Georgia 166 was once part of a larger proposed Interstate 420 alignment. This urban loop was to provide relief to the downtown stretch of Interstate 20 to the north. Beginning at Douglasville west of Atlanta, Interstate 420 was to curve southeastward from Interstate 20 to Interstate 285 via Georgia 166. The Lakewood Freeway was to carry Interstate 420 east to rejoin Interstate 20 at Gresham Park.
Like Interstate 475 and Interstate 485 before it, Interstate 420 was not constructed due to community opposition. Even though many maps from the 1960s and 1970s showed Interstate 420 as a proposed route, it was never constructed, with the exception of today's Georgia 166. The Interstate 420 designation was largely abandoned by the late 1970s in Atlanta, even though the path of the highway was still found on documents dated into the late 1980s (such as the 1988 Metro Atlanta Planning Map). More recently, the existing Georgia 166 was renamed from the Lakeland Freeway to Langford Parkway in 1999.
| Georgia 166 East
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| The first interchange of the Langford Parkway eastbound exists at Greenbriar Parkway just east of Interstate 285. This partial diamond interchange serves nearby Greenbriar Mall, Campbellton Road, and Mt. Gilead Road. Photo taken 08/22/03.
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| Georgia 166 eastbound within the Greenbriar Parkway interchange. A 2003 construction project sees expansion of the roadway and creation of a new centerline guard rail system. Photo taken 08/22/03.
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| Descending toward the Dodson Road overpass on Georgia 166 eastbound. The compact right-of-way and lack of full shoulders is part of the reason why the state highway is not part of the Interstate system. Photo taken 08/22/03.
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| A folded diamond interchange composes the second interchange of Georgia 166 eastbound. Departing here is the off-ramp to DeLowe Drive. A service road connects this arterial with Stanton Road to the east. These two north-south highways serve the city of East Point. Photo taken 08/22/03.
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