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 136 Oklahoma State Highway 136 State Highway 136 (abbreviated SH-136) is a state highway in Oklahoma. It runs across Texas County in the Oklahoma Panhandle, from the adjoining state of Texas in the south to Kansas in the north. SH-136 does not have any letter-suffixed spur routes branching from it, however, it does have a truck route bypassing downtown Guymon. State Highway 136 was designated as such to match the number of the Texas state highway it connects to. SH-136 begins at the Texas state line about north of Gruver. It runs north to Guymon, where it joins US-64, US-412 and