23 CFR 771.101: Purpose.

This part prescribes the policies and procedures of the Federal Highway Administration (FHWA), the Federal Railroad Administration (FRA), and the Federal Transit Administration (FTA) for implementing the National Environmental Policy Act of 1969 as amended (NEPA). Together these regulations set forth all FHWA, FRA, FTA, and U.S. Department of Transportation (DOT) requirements under NEPA for the processing of highway, public transportation, and railroad actions. This part also sets forth procedures to comply with 23 U.S.C. 109(h), 128, 138, 139, 203(e), 326, and 327; 49 U.S.C. 303, 24201, 5323(c) and 5323(q); Public Law 112-141, 126 Stat. 405, section 1301 as applicable; and Public Law 114-94, 129 Stat. 1312, section 1304.