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State Route 400 (SR 400) is a controlled access state highway in the northern part of the U.S. state of Georgia. 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 northern suburbs. SR 400 travels from the Buckhead neighborhood of Atlanta, at Interstate 85 (I-85), to 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 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"; upon reaching the Perimeter (I-285) and beyond, the highway is designated "Turner–McDonald Parkway". SR 400 is known locally as the "Georgia Autobahn", the "North Georgia Autobahn", or the "Alpharetta Autobahn" due to the prevalence of speeding. ==Route description== Georgia State Route 400 begins at Interstate 85 just north of Downtown Atlanta, goes through Buckhead, then has a junction with Interstate 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.〔 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. Exits on 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.) instead of the number of the nearest mile marker. At the south terminus, new ramps connecting Georgia 400 south to Interstate 85 north and Interstate 85 south to Georgia 400 north opened on April 2, 2014.〔http://www.ajc.com/gallery/news/flyover-ramp-connecting-400-85-opens/gCJyY/#4856237〕 The project was two years in the making and was paid for with funds from the Georgia 400 toll plaza. Prior, drivers had to exit off 400 onto Sidney Marcus Blvd. to get to I-85 north. On I-85 south, drivers had to take the Cheshire Bride Rd./Lenox Rd. exit to get to Sidney Marcus for access onto 400 north. The ramp from 85 south is shared with Georgia highway 13 ramp (exit 86). From 400, Sidney Marcus Blvd. is now exit 1B and the ramp to I-85 north is 1A. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Georgia State Route 400」の詳細全文を読む スポンサード リンク
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