State Highway 18 (Oklahoma)
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| Route information | ||||
| Maintained by ODOT | ||||
| Length: | 134.4 mi (216.3 km) | |||
| Existed: | 1924 – present | |||
| Major junctions | ||||
| South end: |
        US-177 / US-270 / US-270 Bus. / SH-3W in Shawnee
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| North end: |
 K-15 at the Kansas state line |
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| Highway system | ||||
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Oklahoma State Highway System
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State Highway 18, abbreviated as SH-18 or OK-18, is a highway maintained by the U.S. state of Oklahoma. It was once one of the longest state highways in the Oklahoma road system, but now has a total length of 134.4 mi (216.3 km).
State Highway 18 was commissioned in August 1924 and, at one time, traveled from Dickson, Oklahoma to Shidler, Oklahoma at the Kansas border. Much of SH-18 has been replaced by US-177. The current Highway 18 begins in Shawnee, Oklahoma at an interchange with US-177/270 and SH-3W. The highway is known as Harrison Street through Shawnee. After Shawnee, SH-18 intersects with US-62 in Meeker, Oklahoma and then into Chandler, Oklahoma concurrent with SH-66. The highways split after leaving Chandler's business district. SH-18 intersects with I-44 and then travels on to Agra, Oklahoma. At Agra, SH-18 joins with SH-33 heading into Cushing, Oklahoma where SH-18 separates and heads to Pawnee, Oklahoma. South of there, the highway overlaps US-64 for two miles (3 km). SH-18 crosses the Arkansas River in Ralston, Oklahoma and intersects with SH-20. Near the Osage Indian Reservation, SH-18 joins with SH-11 at US-60 and remains joined until Shidler, where SH-11 separates. 16 miles (26 km) later SH-18 becomes K-15 as it crosses the state line into Kansas.
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