Action. A highway, transit, or railroad project proposed for U.S. DOT funding. It also can include activities such as joint and multiple use permits, changes in access control, or rulemakings, which may or may not involve a commitment of Federal funds.
23 CFR § 771.107
The definitions contained in the CEQ regulations and in titles 23 and 49 of the United States Code are applicable. In addition, the following definitions apply to this part.