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 164 due east from SH-74 rather than forming a concurrency with it. Instead, it continued east to I-35, following it south to Perry. The old alignment of US-64 between Perry and Covington then became SH-164. Oklahoma State Highway 164 State Highway 164 (abbreviated SH-164) is a state highway in north-central Oklahoma. It runs from SH-74 in Covington to U.S. Route 77 (US-77) west of Perry. SH-164 is long. It has no lettered spur routes. The route of SH-164 was initially served by US-64. The highway was assigned the SH-164 designation when US-64 was realigned around 1971. SH-164 begins on the southern