1. FHWA, Highway Statistics 2010, http://www.fhwa.dot.gov/policyinformation/statistics/2010/hm20.cfm, Accessed December 12, 2023.
2. Transportation Research Board. 2022. Highway Capacity Manual 7th Edition: A Guide for Multimodal Mobility Analysis. Washington, DC: The National Academies Press.
3. Washburn, S.S., A. Al-Kaisy, T. Luttinen, R. Dowling, D. Watson, A. Jafari, Z. Bian, and A. Elias. NCHRP Web-Only Document 255: Improved Analysis of Tow-Lane Highway Capacity and Operational Performance. Final Report for NCHRP Project 17-65, March 2018. http://www.trb.org/main/blurbs/177835.aspx. Accessed December 12, 2023.
4. “A Policy on Geometric Design of Highways and Streets”, 7th Edition, American Association of State Highway and Transportation Officials, Washington DC, 2018
5. “A Policy on Geometric Design of Highways and Streets”, 4th Edition, American Association of State Highway and Transportation Officials, Washington DC, 2004