north, in Noble County, it crosses US-64 and the mainline of the Cimarron Turnpike. It then has a four mile (6.4 km) concurrency with State Highway 15. US-177 then enters its final county in Oklahoma, Kay County. It serves Ponca City, where it begins a wrong-way concurrency with its parent, US-77, as well as US-60 (which is signed the "correct" direction). The routes split near Tonkawa. US-177 then runs through Blackwell and Braman. North of Braman, the route is the northernmost exit on Interstate 35 in Oklahoma. Six miles (9.7 km) after the I-35 junction, US-177 leaves Oklahoma. Kansas US-177 then enters Sumner County, Kansas near Hunnewell. Only 4 mi (6.4 km) north of the state line, US-177 ends at US-81 in downtown South Haven, Kansas. The terminus is less than a mile from the western terminus of US-166 (also on US-81) north of town. History Originally, the highway functioned as a shortcut for Wichita to Oklahoma City traffic traveling between US-81 at South Haven, KS and US-77 at Three Sands Jct, Oklahoma (where US-77 and State Highway 156 intersect outside Marland, Oklahoma today). During the 1960s, the highway was extended south to Madill, Oklahoma, replacing the entire length of State Highway 40 from Ponca City, Oklahoma to then-US-66 (near Wellston, Oklahoma) and the portion of State Highway 18 between Shawnee, Oklahoma and Madill, Oklahoma (the segment between US-66 and Shawnee was constructed at this time). Vestiages of these highways remain in spur routes State Highway 40A, located entirely in Carney, Oklahoma and State Highway 18A, located south of Sulphur, Oklahoma. During this extension, the alignments of US-77 and US-177 were altered in North Central Oklahoma as follows: US-77 was relocated to run north from Three Sands Jct to Tonkawa, Oklahoma on the former route of US-177, then east on US-60 to Ponca City, Oklahoma. This also involved a new US-60 alignment between Tonkawa, Oklahoma and Ponca City, Oklahoma, where US-60, US-77, and US-177 all overlap on the same highway (which results in northbound US-77, eastbound US-60, and southbound US-177 traffic running in the same compass direction: east). Junction list State Highway 40A State Highway 40A is an highway in Lincoln County, Oklahoma. It is numbered after State Highway 40, the predecessor to US-177. It is the shortest state highway in Oklahoma. The highway connects US-177 to the town of Carney, Oklahoma. It has a 25 mph (40 km/h) speed