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Primary projects

Transportation projects vary in type, size, complexity, and potential to affect the human and natural environment. To account for the variability of project impacts, three basic "classes of action" are allowed and determine how compliance with NEPA is carried out and documented.

Environmental impact statement - EIS Environmental assessment - EA Categorical exclusion- CE Section 4(f)
An environmental impact statement (EIS) is prepared for projects where it is known that the action will have a significant effect on the environment. The following are examples of actions that normally require an EIS.

  • A new controlled access freeway.
  • A highway project of four or more lanes on a new alignment.
  • New construction or extension of fixed-rail transit facilities.
  • New construction or extension of a separate roadway for buses or high-occupancy vehicles not located within an existing highway facility.
  • 23 CFR 771.115
    23 CFR 771.123
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