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U.S. Highway 431 (US-431), internally designated by the Alabama Department of Transportation as State Route 1 (SR-1), is a major north–south state highway across the eastern part of the U.S. state of Alabama. Although US-431's south end is in Dothan, SR-1 continues south for about 13 miles (21 km) along US-231 to the Florida state line. ==Route description== State Route 1 is primarily the unsigned partner route assigned to U.S. Highway 431. The two routes are co-aligned from the southern terminus of US-431 at Dothan to the Tennessee state line. South of Dothan, State Route 1 is assigned to U.S. Highway 231. The two highways run north from Dothan through the Wiregrass region of southeastern Alabama through the towns of Headland and Abbeville en route to Eufaula, where it intersects U.S. Route 82. North of Eufaula, en route to Phenix City, the highway encounters some of the most sparsely populated parts of the state, only passing near the unincorporated communities of Pittsview, Glenville, and Seale in the 46 mile (74 km) drive between the two cities. In Phenix City, the highway junctions with U.S. Route 280 and U.S. Route 80. North of Phenix City, en route to Opelika, US 431 and US 280 join together for a concurrency, passing through the cities of Smiths Station and Salem on the way into Opelika. In Opelika, the two highways cross Interstate 85 and split in Opelika; US 431 continuing northeastward and US 280 northwestward. North of Opelika, the highway encounters rural terrain again, passing through the cities of LaFayette, Roanoke, and Wedowee en route to Anniston. In Oxford, just south of Anniston, the highway crosses Interstate 20 and goes through Anniston, northward into Gadsden, where it crosses Interstate 59 and continues northwestward, passing through Guntersville en route to Huntsville. In Huntsville, US-231 and US-431 (Governors Drive) junction again as Memorial Parkway, and State Route 1 is partnered with both U.S. Highways until they cross into Tennessee. From its point of origin in Houston County, State Route 1 is aligned very close to the Alabama-Georgia border, coming within less than one mile (1.6 km) of the border at both Eufaula and Phenix City. At Phenix City, US-431 and unsigned State Route 1 begin a concurrency with U.S. Highway 280 and unsigned State Route 38 and turn to the northwest. At Opelika, US-431 and State Route 1 divert from US-280 and resume their northward orientation. East of Oxford, State Route 1 and US-431 merge with westbound U.S. Highway 78 and unsigned State Route 4. At Oxford, State Route 1 and US-431 begin a gradual northwestward trajectory, passing through Anniston, Gadsden and Guntersville. The two routes resume their northward orientation upon merging with U.S. Highway 231 at Huntsville. The portion through Oxford and Anniston is currently routed via Quintard Avenue, which constitutes the major north-south business and local route through these cities. It is a congested route with many traffic signals and no room for widening. It is intended that the route will eventually be shifted to Veterans Memorial Parkway when that road is completed in 2015; this will take the through traffic off of Quintard Avenue. 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「U.S. Route 431 in Alabama」の詳細全文を読む スポンサード リンク
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