Federal-aid highways are defined in Title 23 of the United States Code. There are two other federal-aid definitions – the specific federal or state program of interest should make clear which definition to use.

Federal-aid Highways, Federal-aid Systems & Federal-aid Eligible

The definitions in this area refer to arterials, collectors and local roads. These terms come from National Functional Classification (NFC), a transportation planning tool. All public roads are classified according to the function they serve within the overall roadway network. In addition to defining federal-aid eligibility, NFC allows roads to be studied and compared across different regions of the state or the entire country.

Federal-aid Eligibility: Using NFC Maps

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