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 123 until it changes course and runs due east to Dewey, where it terminates at US-75. Oklahoma State Highway 123 State Highway 123 (abbreviated SH-123) is a state highway in the U.S. state of Oklahoma. It runs a general southwest–northeast course for in northern Oklahoma. SH-123 has no lettered spur routes. SH-123 begins east of Barnsdall, Oklahoma, in Osage County at State Highway 11. It heads north to the Woolaroc Museum before turning northeast. As it approaches the Washington County line, it turns northward to parallel it. SH-123 then enters western Bartlesville, overlapping US-60 for one-fifth of a mile (0.3 km).