Corridor D
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| Major junctions | |
| West end: |
 I-275 near Cincinnati, OH
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 US 23/Corr. C near Piketon, OH I-77 near Parkersburg, WV
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| East end: |
 I-79 near Clarksburg, WV
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| Highway system | |
In the United States, Corridor D is part of the Appalachian Development Highway System. It travels from Bridgeport, West Virginia to Cincinnati, Ohio. It travels US 50 for much of its eastern portion. The western portion of road in Ohio is known as State Route 32. ADHS Funding is separate from other Federal Highway funds.
The east end of Corridor D begins on US 50 between Clarksburg and Bridgeport, West Virginia, at Interstate 79. US 50 continues on its westerly heading toward Parkersburg and intersects Interstate 77 just outside downtown Parkersburg. The highway continues over the Ohio River on the Blennerhassett Island Bridge.
After crossing the Ohio River into Belpre, Ohio, the highway joins with State Route 32 and starts southwest for about 15 miles (24 km) then turns northwest for another 15 miles (24 km) reaching Athens. The combined US-50/OH-32 makes another turn southwest for about 12 miles (19 km). Then, US 50 and OH-32 diverge. US-50 begins heading west, OH-32, southwest. Corridor D follows OH-32 about 20 miles (32 km) to Jackson, where it is intersected by US-35. The highway heads due west for about 25 miles (40 km) and intersects US 23, Corridor C between Portsmouth and Chillicothe. OH-32 continues west for about 100 miles (160 km) into Cincinnati, crossing US-62, US-68 and Interstate 275, Cincinnati's beltway, in the process.
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Wikipedia