1. I have drawn on Daniel Klein and John Majewski, “America’s Toll Road Heritage: The Achievements of Private Initiative in the Nineteenth Century,” in Street Smart, ed. Gabriel Roth (New Brunswick, NJ: Transaction Publishers, 2006).
2. Daniel B. Klein, “The Voluntary Provision of Public Goods? The Turnpike Companies of Early America,” Economic Inquiry 28:4 (October 1990): 788–812
3. Daniel B. Klein and Gordon J. Fielding, “Private Toll Roads Learning from the 19th Century,” Transportation Quarterly 46:3 (July 1992): 321–341
4. Daniel B. Klein and Chi Yin, “Use, Esteem, and Profit in Voluntary Provision: Toll Roads in California, 1850–1902,” Economic Inquiry 34:4 (October 1996): 678–692
5. José A. Gómez-Ibánez and John R. Meyer, Going Private: The International Experience with Transport Privatization (Washington, DC: Brookings Institution, 1993), 164–168.