Does it end at US 160 or is it "dualled" (KDOT terminology) with US 69 to the Oklahoma line?
K-7 is "dualled" with US 69 south of US 160.
Visual confirmation:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.route56.com%2Fgallery%2Fzp-core%2Fi.php%3Fa%3D2010%2Fmay10%2F053110%26amp%3Bi%3D40036.jpg%26amp%3Bs%3D630%26amp%3Bq%3D85%26amp%3Bwmk%3DUS_56&hash=f8e99c060664fded6df4f7e75950b0363354163a)
http://www.route56.com/gallery/2010/may10/053110/40036.jpg.php