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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. [1]
Texas state line in Texhoma: Kansas state line northeast of Tyrone: 1926: current US 56: 71.17 [4] 114.54 New Mexico state line southwest of Felt: Kansas state line south of Elkhart, Kan. 1956: current US 59: 216.47 [5] 348.37 Arkansas state line southeast of Page: Kansas state line north of Welch: 1935: current US 60: 352.39 [6] 567.12
The state's first 29 numbered highways were commissioned on August 29, 1924. [7] As of May 1, 1926, the state highway system consisted of 3,682 miles (5,926 km) of graded dirt roads (72% of the system), 832 miles (1,339 km) of gravel roads (16%), and 634 miles (1,020 km) of paved roads, for a total system length of 5,148 miles (8,285 km). [8]
In the early 2000s, Oklahoma was 48th in the nation for bridge conditions. Today, the state ranks in the top 10 nationally for good bridge conditions.
Interstate 40 (I-40) is an Interstate Highway in Oklahoma that runs 331 miles (533 km) across the state from Texas to Arkansas. West of Oklahoma City, it parallels and replaces old U.S. Highway 66 (US-66), and, east of Oklahoma City, it parallels US-62, US-266, and US-64. I-40 is the longest Interstate highway in Oklahoma.
[8] [9] With the introduction of the auto trails, this corridor was served by the Meridian Highway. [10] When the Oklahoma numbered highway system was established in 1925, the route that would eventually become US-81 was designated as State Highway 2. [11] The US-81 designation was applied the following year, on December 7, 1926. [2]
U.S. Highway 69 crosses the Red River to enter Bryan County, Oklahoma concurrent with US-75 3 miles (4.8 km) [2] south of Colbert. The first few miles of highway north of the state line are freeway-grade, featuring three interchanges, including one at State Highway 91. Near Calera, the route downgrades to an expressway.
The following year, a large portion of the highway was removed from the state highway system. On October 19, 1937, between the SH-9 junction and US-66, the route ceased to be maintained by the Department of Highways. [2] SH-30 still appeared as such on the 1938 state highway map, but with dashed lines, indicating the route was not maintained. [6]