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Georgia State Route 20
State Route 20 (SR 20) is a U.S. state route roughly in the shape of a capital J rotated ninety degrees to the left, which runs through portions of Floyd, Bartow, Cherokee, Forsyth, Gwinnett, Walton, Rockdale, Newton, and Henry counties in northwestern and north-central Georgia. Its counterclockwise, or western terminus is at the Alabama state line in Floyd County, and its clockwise, or eastern terminus occurs at its intersection with U.S. Route 19/U.S. Route 41 (US 19/US 41) and SR 3 in Hampton in Henry County at the Atlanta Motor Speedway.
==Route description==
From the Alabama state line, SR 20 proceeds east through central Floyd County into the city of Rome, and is concurrent with US 27, SR 1, and SR 53 through downtown Rome. The highway leaves Rome to the east concurrent with US 411, bisecting Floyd County, and crosses into and bisects Bartow County, still co-signed with US 411until just north of Cartersville (US 41 is briefly concurrent near Cartersville as well), after which SR 20 continues eastward on its own. The route intersects I-75 northeast of Cartersville, and continues to head east, passing Lake Allatoona to its north, and crossing into Cherokee County. SR 20 heads east into central Cherokee County and through its county seat in Canton, and crosses I-575, before continuing east into Forsyth County. In central Forsyth County, the route dips southeast to pass to the south of Sawnee Mountain and heads through Cumming, crossing US 19 and SR 400, and heading on into Gwinnett County, passing to the south of Lake Lanier. SR 20 then turns south after intersecting I-985, crossing I-85 shortly thereafter. The road also has provides access to SR 316, leading to Athens.
SR 20 continues southward through Lawrenceville and heads into Walton County and through Loganville, paralleling the Gwinnett-Walton County line, before crossing into Rockdale County and meeting I-20 just south of Conyers. Likely to help alleviate driver confusion due to two identically-numbered highways meeting, the highway is usually referred to at this point as SR 138, with which it runs concurrent through Conyers. SR 20 continues south and then southwest to the Henry County seat of McDonough, where it briefly runs concurrent with SR 81. SR 81 departs to the west after the routes cross I-75 at exit 218. The portion of SR 20 between the western end of the SR 81 concurrency and US 19/US 41, the route's clockwise/eastern terminus, has recently been widened from two lanes to four, including a new southern bypass of the city of Hampton, and more controlled access at US 19/US 41. The primary purpose of the widening is to facilitate the flow of traffic to and from the Atlanta Motor Speedway located near the highway's eastern terminus.〔〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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