The Federal-Aid Highway Program (FAHP) represents one of the largest grant programs in the federal domestic budget and is a combination of individual categorical and discretionary grant programs.
The TRB National Cooperative Highway Research Program's NCHRP Research Report 1023: Federal Funding Flexibility: Use of Federal-Aid Highway Fund Transfers by State DOTs investigates recent experience with statutory features that allow recipients of formula grants to shift the authority to use federal funds from one FAHP category to another, and even into other modes.
Supplemental to the report are a related webinar video, slides from the webinar, and notes from the webinar.
National Academies of Sciences, Engineering, and Medicine. 2022. Federal Funding Flexibility: Use of Federal-Aid Highway Fund Transfers by State DOTs. Washington, DC: The National Academies Press. https://doi.org/10.17226/26696.
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