A comprehensive federal law requiring analysis of the environmental impacts of federal actions such as the approval of grants; also requiring preparation of an Environmental Impact Statement (EIS) for every major federal action significantly affecting the quality of the human environment.
NEPA is the Federal law requiring an analysis of the environmental effects of Federally-assisted actions and projects. In the case of highways, this assistance usually takes the form of the provision of Federal funds to pay a portion of a project's planning, design, and/or construction costs. This environmental analysis takes the form of an Environmental Impact Statement (EIS) for every major Federal project that significantly affects the quality of the environment.
Established a national environmental policy requiring that any project using federal funding or requiring federal approval, including transportation projects, examine the effects of proposed and alternative choices on the environment before a federal decision is made.