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
South Australian borders became the SA/CA border. In 1931 North Australia and Central Australia were reunited as the Northern Territory (12 June 1931 - Map). From 1931 26° south once again became the SA/NT border. Marking the South Australian borders on the ground has a fascinating history. "See History of fixing SA/WA border on the ground" The actual West Australian border with the Northern Territory and South Australia, which has been marked on the ground, is not as straight as it looks, with the WA/NT and WA/SA borders being displaced by approximately 127 m due to early survey errors within the limits of