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 55 State Highway 54 in Lake Valley. Oklahoma State Highway 55 State Highway 55 is a state highway in western Oklahoma. It runs for from Carter, Oklahoma to the unincorporated community of Lake Valley. It has no lettered spur routes. SH-55 begins at State Highway 34 in Carter, in eastern Beckham Co.. It heads east for six miles (10 km), where it meets State Highway 6 and overlaps it to the south. After running along the Beckham/Washita Co. line, it splits off to the east near Retrop. It then meets State Highway 44 in Sentinel. Seven miles later it meets US-183