Interstate 26 (English Wikipedia)

Johnston, Louis; Williamson, Samuel H. (2023). "What Was the U.S. GDP Then?". MeasuringWorth. Retrieved November 30, 2023. United States Gross Domestic Product deflator figures follow the MeasuringWorth series.

mountainx.com

Allen, Calvin (July 16, 2003). "The Political History of I-26". Mountain Xpress. Asheville, NC. Retrieved December 2, 2013.

"221-Mile I-26 Longest Of State's Freeways". Herald-Journal. Spartanburg, South Carolina. February 28, 1979. p. 5. Retrieved March 8, 2025.

Slade, David; Jackson, Angie (September 11, 2018). "Lanes reversed for evacuations, but I-26 near Charleston carried half the normal traffic". Post and Courier. Retrieved August 15, 2019.
"South Carolina's first freeway, snapshots from the past". Post and Courier. January 15, 2014. Retrieved August 15, 2019.

Special Committee on U.S. Route Numbering (May 31, 2003). "Report of the Special Committee on U.S. Route Numbering to the Standing Committee on Highways" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 11. Archived from the original (PDF) on October 16, 2017. Retrieved December 2, 2013.
Special Committee on U.S. Route Numbering (May 6, 2006). "Special Committee on U.S. Route Numbering Approved Applications" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 1. Archived from the original (PDF) on October 16, 2017. Retrieved December 2, 2013.

"Highway Evacuations in Selected Metropolitan Areas: Assessment of Impediments" (PDF). Federal Highway Administration. April 2010. Archived from the original on February 13, 2017. Retrieved August 9, 2023.
Special Committee on U.S. Route Numbering (May 31, 2003). "Report of the Special Committee on U.S. Route Numbering to the Standing Committee on Highways" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 11. Archived from the original (PDF) on October 16, 2017. Retrieved December 2, 2013.
Special Committee on U.S. Route Numbering (May 6, 2006). "Special Committee on U.S. Route Numbering Approved Applications" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 1. Archived from the original (PDF) on October 16, 2017. Retrieved December 2, 2013.