It shall be the duty of the secretary of transportation to designate and mark by suitable signs, following as nearly as possible the route of the historic Chisholm trail in Kansas, on the following described highways: Highway K-15 from Abilene south to Newton to the junction of highway U.S. 81; thence on highway U.S. 81 south to the Kansas-Oklahoma state line.
K.S.A. 68-1021