Virginia State Route 646 (Surry County)
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| Route information | ||||
| Maintained by Virginia DOT | ||||
| Length: | 227.689 mi (366.430 km) | |||
| Existed: | 1933 – present | |||
| Major junctions | ||||
| West end: |
 SR 8 at Woolwine
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 US 220 in Rocky Mount US 29 near Gretna  US 15 / US 360 near Keysville I‑85 near McKenney I‑95 near Stony Creek
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| East end: |
  SR 10 / SR 646 at Spring Grove
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| Highway system | ||||
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→
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| Location: | Victoria |
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| Location: | Stony Creek |
State Route 40 (SR 40) is a primary state highway in the southern part of the U.S. state of Virginia. It runs from State Route 8 at Woolwine east to State Route 10 at Spring Grove, about half the width of Virginia. It is the longest state-numbered (not U.S. or Interstate) route in Virginia.
SR 40 begins at SR 8 at the small community of Woolwine. It heads northeast along the eastern side of the Blue Ridge, crossing streams and foothills via a curving route. Around Endicott, the highway starts to turn east, away from the ridge, and straightens out as the terrain becomes flatter. Between Ferrum and Rocky Mount, SR 40 parallels the Norfolk Southern Railway's north–south Winston-Salem District. The route intersects U.S. Route 220 Business in downtown Rocky Mount and the newer US 220 bypass to the east, soon splitting from SR 122, which leads northeast to Bedford, and turning directly east. After it leaves Rocky Mount, SR 40 heads east, largely along a newer alignment that utilizes cuts and fills to provide a straight and level path. Approaching Gretna, it intersects the US 29 bypass, and then US 29 Business in downtown Gretna. This portion of the highway ends where it meets US 501 at North Halifax, turning north and crossing the Roanoke River into Brookneal.
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