SH-4 (OK)
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| Route information | ||||
| Maintained by ODOT | ||||
| History: | 1941–present (western SH-4) 1963–present (eastern SH-4) |
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| Section 1 | ||||
| Length: | 29.5 mi (47.5 km) | |||
| South end: |
  I‑44 / H.E. Bailey Turnpike south of Bridge Creek
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| North end: | Piedmont | |||
| Section 2 | ||||
| Length: | 12.01 mi (19.33 km) | |||
| West end: |
 US-259 in Smithville
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| East end: |
 AR 4 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 4, abbreviated as SH-4 or OK-4, is a designation for two distinct highways maintained by the U.S. state of Oklahoma. One of them serves as an important route through the suburbs west of Oklahoma City, while the other connects US-259 to the Arkansas state line west of Cove, Arkansas. SH-4 has no lettered spur routes.
The two SH-4s were never connected. The Central Oklahoma highway was established in 1941 and gradually extended to its present extent between then and 2003. The Eastern Oklahoma highway was originally numbered SH-21, and was renumbered to SH-4 in 1963.
The western Highway 4 is 29.5 miles (47.5 km) long. It begins at the western terminus of the H.E. Bailey Turnpike Spur south of Bridge Creek, Oklahoma, and immediately curves due north. It is a two-lane road until it reaches SH-37, where it expands to four lanes. Seven miles (11.2 km) later, it joins with SH-152 in the town of Mustang. One mile (1.66 km) later, SH-4 continues northward along Mustang Road toward Interstate 40 and Yukon.
After crossing I-40, SH-4 becomes a two-lane road once again until entering Yukon, at which point it becomes a four-lane road again. It meets SH-66, once Route 66, in Yukon. Seven miles (11.2 km) later, it meets the Northwest Expressway (SH-3). It lasts for just three miles (4.8 km) longer until ending at Edmond Road in Piedmont.
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Wikipedia