K-55 is a west–east state highway in the U.S. state of Kansas. The highway's western terminus is at U.S. Route 81 (US-81) roughly north of Wellington and the eastern terminus is at K-15 in Udall. It passes through the city of Belle Plaine. The road's westbound terminus is a triangle-type intersection. Just before the western terminus, the road passes under the Kansas Turnpike, although there is no intersection. Turnpike access is available at K-53 to the north and US-160 to the south near Wellington. Before state highways were numbered in Kansas there were auto trails. K-55's western terminus closely follows the Meridian Highway and the South West Trail. It was first designated a state highway by 1927, and at that time ran from US-81 in Belle Plaine southeast to K-12 in Oxford. A year later, it had been realigned to travel east from US-81 to K-15 west of Udall. By 1945, a new alignment of K-15 had been completed, at which time K-55 was extended east to the new alignment. The entire length of K-55 was paved by 1948. Route description K-55's western terminus is at US-81 north of Wellington. The highway travels east through flat rural farmland and after roughly passes under I-35, also known as the Kansas Turnpike, with no connection. K-55 continues east to an at-grade crossing with a BNSF Railway track as it enters the city of Belle Plaine. It continues through the city as 4th Avenue for about then exits the city. K-55 proceeds east to a crossing over Cowskin Creek, a tributary of the Arkansas River. It continues through flat farmland to a crossing over the Arkansas River, a tributary of the Mississippi River. K-55 continues east to a crossing over Antelope Creek before entering Cowley County. The roadway enters the city of Udall and has an at-grade crossing with a BNSF Railway track. K-55 reaches Clark Street where it turns north and reaches its eastern terminus at K-15. The Kansas Department of Transportation (KDOT) tracks the traffic levels on its highways, and in 2018, they determined that on average the traffic varied from 805 vehicles per day near the eastern terminus to 2,050 vehicles per day just east of Belle Plaine. K-55 connects to the National Highway System at its junction with K-15. History Before state highways were numbered in Kansas there were auto trails, which were an informal network of marked routes