Oklahoma State Highway 4 Oklahoma State Highway 4 State Highway 4, abbreviated as SH-4 or OK-4, is a designation for two distinct highways maintained by the U.S. state of Oklahoma. One of them serves as an important route through the suburbs west of Oklahoma City, while the other connects US-259 to the Arkansas state line west of Cove, Arkansas. SH-4 has no lettered spur routes. The two SH-4s were never connected. The Central Oklahoma highway was established in 1941 and gradually extended to its present extent between then and 2003. The Eastern Oklahoma highway was originally numbered SH-21, and was renumbered to SH-4 in
Oklahoma State Highway 55 State Highway 54 in Lake Valley. Oklahoma State Highway 55 State Highway 55 is a state highway in western Oklahoma. It runs for from Carter, Oklahoma to the unincorporated community of Lake Valley. It has no lettered spur routes. SH-55 begins at State Highway 34 in Carter, in eastern Beckham Co.. It heads east for six miles (10 km), where it meets State Highway 6 and overlaps it to the south. After running along the Beckham/Washita Co. line, it splits off to the east near Retrop. It then meets State Highway 44 in Sentinel. Seven miles later it meets US-183