Oklahoma State Highway 3
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| Route information | ||||
| Maintained by ODOT | ||||
| Length: | 615.0 mi (989.7 km) | |||
| Existed: | 1939 – present | |||
| Major junctions | ||||
| West end: |
  US-287 / US-385 Colorado state line (concurrent with US-287/385)
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 Kilpatrick Turnpike near Oklahoma City I‑44 in Oklahoma City I‑40 in Oklahoma City I‑35 in Oklahoma CityI‑40 in Shawnee Indian Nation Turnpike in Antlers
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| East end: |
 AR 32 at the Arkansas state line |
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| Highway system | ||||
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Oklahoma State Highway System
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State Highway 3, also abbreviated as SH-3 or OK-3, is a highway maintained by the U.S. state of Oklahoma. Traveling diagonally through Oklahoma, from the Panhandle to the far southeastern corner of the state, SH-3 is the longest state highway in the Oklahoma road system, at a total length of 615 miles (990 km) via SH-3E (see below).
Highway 3 begins at the Colorado state line 19 mi (31 km) north of Boise City, Oklahoma. At this terminus, it is concurrent with US-287/US-385. It remains concurrent with the two U.S. Routes until reaching Boise City, where it encounters a traffic circle which contains five other highways. After the circle, US-385 splits off, and SH-3 overlaps US-287, US-56, US-64, and US-412, though US-56 and US-287 both split off within the next 8 miles (13 km).
In Guymon, US-64 splits off. At Elmwood, US-270 joins US-412, coming from a concurrency with State Highway 23. SH-3 remains concurrent with US-270 through Watonga. In Seiling, US-183 leaves the concurrency but is quickly replaced by U.S. Highway 281. SH-33 joins the roadbed 20 miles (32 km) later.
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