1. Federal Highway Administration (FHWA), 2006 Status of the Nation's Highways, Bridges, and Transit: Conditions & Performance (Washington, DC: U.S. Department of Transportation, 2007) (2004 data).
2. Federal Transit Administration, Transit State of Good Repair (Washington,DC: October 2008).
3. Texas Transportation Institute, The 2007 Urban Mobility Report (College Station, TX: September 2007).
4. Needs estimates are National Cooperative Highway Research Program revised estimates based on FHWA, op. cit. note 1; on 2007 estimates in National Surface Transportation Policy and Revenue Study Commission, Transportation for Tomorrow (Washington, DC: 2007); and on Financing Commission estimates developed from data provided by FHWA. Revenue estimates developed by Financing Commission.
5. Based on information from AAA's 2008 edition of Your Driving Costs (Heathrow, FL: AAA, 2008) for average sedans and on data from FHWA, Highway Statistics 2006 (Washington, DC: U.S. Department of Transportation, 2008).
6. Tax credit bonds are a form of debt financing that significantly subsidizes the borrowing cost of the project sponsor (debt issuer) by having the federal government pick up part or all of the interest expense through the provision of tax credits to the investors.