Oklahoma State Highway 270 1979, US-270 ran through Oklahoma City on surface streets. It left the city and ran through Choctaw concurrent with US-62. US-270 split away from US-62 in Harrah, and continued on to Shawnee on what is now SH-270. On March 5, 1979, US-270 was rerouted to run concurrent with Interstate 40 from south of Calumet in Canadian County through the Oklahoma City metro, exiting the Interstate onto a surface alignment in Shawnee. Presumably, SH-270 was commissioned the same date. The realignment of US-270, with SH-270 on the old alignment between Harrah and Shawnee, appears on the 1979 state map. SH-270 followed
Oklahoma State Highway 112 as gravel through Cameron, ending at US-271/SH-9 in what is now Pocola (the town is not shown on contemporary maps). On October 5, 1959, the highway was straightened between Cameron and US-271. By this time, the highway was entirely paved. Further straightening between Cameron and Rock Island occurred on June 1, 1970. The most major change in SH-112's history came on February 5, 1973, when the highway was extended to Arkoma. One further straightening occurred in the Cameron vicinity on June 27, 1982. No further changes have occurred since then. Oklahoma State Highway 112 State Highway 112 is a 24.6