Special Committee on U.S. Route Numbering (November 2023). "2023 Fall Meeting Report to the Council on Highways and Streets"(PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 5. Archived(PDF) from the original on December 5, 2023. Retrieved January 22, 2024.
"Driving Forward OK". Oklahoma Turnpike Authority. Archived from the original on October 31, 2015. Retrieved November 19, 2015.
Special Committee on U.S. Route Numbering (November 2023). "2023 Fall Meeting Report to the Council on Highways and Streets"(PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 5. Archived(PDF) from the original on December 5, 2023. Retrieved January 22, 2024.