List of state highways in Oklahoma
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Oklahoma has a large network of numbered highways maintained by the state. These roads fall into one of three categories: Interstate Highways, U.S. Highways, and state highways. Interstate and U.S. Highways are continuous with surrounding states, while state highways are not (though Oklahoma and another state's department of transportation may coordinate numbering).
The majority of the numbered highways within Oklahoma are maintained by the Oklahoma Department of Transportation (ODOT). The only exceptions are sections of Interstate 44 (I-44) and U.S. Highway 412 (US 412), which run along turnpikes maintained by the Oklahoma Turnpike Authority (OTA). (I-44 runs along the H.E. Bailey, Turner, and Will Rogers turnpikes; US 412 is signed along the Cimarron and Cherokee turnpikes.)
Individual counties may establish a numbering system to apply to roads that they maintain. These highways are not listed here.
State highways
Oklahoma's state highways serve as the second-lowest tier on the Oklahoma road system. They are marked with a number contained inside an outline of the state, having been formerly marked inside a white circle in a black box until January 2006.
SH-81 has not been issued for a state highway so that is not confused with US Highways and Interstates bearing the same number designation.
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