Oklahoma State Highway 14 route continued north along present-day U.S. 281 through Alva to the state line south of Hardtner, Kansas. (The old road north of Vici became part of SH-34.) New U.S. routes were added to Oklahoma's highway system in 1938. Among these were US-281, formerly a split route with one section in Kansas and one in Texas, which was connected in 1938 via Oklahoma; also added in 1938 was a southern extension of US-183. These two routes were overlaid onto SH-14, with US-183 entering the state from the south near Davidson and following the SH-14 route to Seiling, and US-281 taking the
U.S. Route 75 in Kansas 4 miles north of the state line. South of Neodesha, US 75 overlaps with US 400 as a 2 lane freeway. At Interstate 35 (I-35), US 75 becomes a two-lane expressway again, passing east of Melvern Lake. About 15 miles south of Topeka, the highway becomes a four lane freeway. US 75 crosses the Kansas Turnpike without any direct access and drivers must use I-470 to access the turnpike. US 75 runs around the main part of the city along I-470 and I-70. Leaving Topeka, US 75 becomes its own route again. Between Hoyt and Holton, the highway runs along