In the early 1950s, towns along what was then the K-45 corridor, connecting Ellsworth, Kansas to the Oklahoma state line at Elkhart, formed the Mid-Continent Diagonal Highway Association to push for a new highway from Springer, New Mexico (on US 85) northeast across the Oklahoma Panhandle, along K-45, and continuing to Manitowoc, Wisconsin on Lake Michigan. By mid-1954, it was being promoted as U.S. Route 55 between the Great Lakes and the Southwestern United States. The first submissions to the American Association of State Highway Officials (AASHO) to establish the route were made in 1954; all placed the northeast end at Manitowoc, Wisconsin (absorbing US 151 from Cedar Rapids, Iowa), while they varied on whether the southwest end was to be at Albuquerque, New Mexico or Nogales, Arizona. The first route considered in northeast Kansas was via US 40 from Ellsworth to Topeka and K-4 and US 59 via Atchison to St. Joseph, Missouri. A revised route adopted in March 1955, due to AASHO objections to the original route, which traveled concurrently with other U.S. Highways for over half of its length, followed K-14, K-18, US 24, K-63, K-16, and US 59 via Lincoln and Manhattan. In July, the US 50-N Association proposed a plan that would have eliminated US 50N by routing US 55 along most of its length, from Larned east to Baldwin Junction, and then along US 59 to Lawrence and K-10 to Kansas City; towns on US 50N west of Larned, which would have been bypassed, led a successful fight against this.