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Legislation & Regulations


The Transportation Infrastructure Finance and Innovation Act of 1998 (TIFIA) was originally authorized under the Transportation Equity Act for the 21st Century (TEA-21). TIFIA was reauthorized and amended in 2005 by the Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users (SAFETEA-LU). It should be noted that SAFETEA-LU's reauthorization of TIFIA resulted in a renumbering of its sections within Title 23 of the U.S. Code from §§ 181-189 to §§ 601-609. TEA-21 was further amended and restated in 2012, by the Moving Ahead for Progress in the 21st Century Act (MAP-21) (Public Law 112-141), and most recently, was amended in 2015 by the Fixing America's Surface Transportation (FAST) Act (Public Law 114-94).

The USDOT published its rules for the TIFIA program in the Code of Federal Regulations (49 CFR 80) one year after the passage of TEA-21 in June 1999 and revised them in July 2000. Public notices for these acts of rulemaking are provided under Federal Register Notices, along with other announcements related to the TIFIA program. Where the statute and the regulation conflict, the statute takes precedence.



Federal Register Notices


Pursuant to the FAST Act, DOT announced the availability of $1.435 billion in capital over five years for the TIFIA credit assistance program (and any funds that may be available from prior fiscal years) to provide TIFIA credit assistance for eligible projects. Projects must meet statutorily specified eligibility criteria to receive credit assistance. The Notice of Funding Availability (NOFA), published on March 11, 2016, outlines the process that applicants must follow.

DOT has revised the Letter of Interest form to address the FAST Act. Submit all Letters of Interest via e-mail at:

Letter of Interest (DOC)



Previous TIFIA Statutes

Updated: Wednesday, November 21, 2018
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