| 3-C | Continuing Comprehensive and Cooperative Planning Process |
| AADT | Annual Average Daily Traffic |
| AASHTO | American Association of State Highway Transportation Officials |
| ACHP | Advisory Council on Historic Preservation |
| ADA | American with Disabilities Act |
| ADRA | Administrative Dispute Resolution Act |
| ADT | Average Daily Traffic |
| AECs | Areas of Environmental Concern |
| APE | Area of Potential Effect |
| AQI | Air Quality Index |
| AQNMP | Air Quality and Noise Management Plan |
| ARNI | Aquatic Resources of National Importance |
| AST | Above-ground Storage Tank |
| BA | Biological Assessment |
| BIA | Bureau of Indian Affairs |
| BMPs | Best Management Practices |
| BO | Biological Opinion |
| CAA | Clean Air Act |
| CAAA | Clean Air Act Amendments |
| CAMA | Coastal Area Management Act |
| CBD | Central Business District |
| CBRA | Coastal Barrier Resources Act |
| CE | Categorical Exclusion |
| CEQ | Council on Environmental Quality |
| CERCLA | Comprehensive Environmental Response, Compensation & Liability Act |
| CFR | Code of Federal Regulations |
| CIA | Community Impact Analysis |
| CIW | Citizens Information Workshop |
| CMP | Construction Management Plan |
| CMP | Corrugated Metal Pipe |
| CO | Carbon Monoxide |
| CTP | Comprehensive Transportation Planning |
| CU | Cataloguing Unit |
| CWA | Clean Water Act |
| CZMA | Coastal Zone Management Act |
| DAQ | Division of Air Quality |
| DCA | Division of Community Assistance |
| DCM | Division of Coastal Management |
| DEIS | Draft Environmental Impact Statement |
| DEO | Division Environmental Officer |
| DFR | Division of Forest Resources |
| DMF | Division of Marine Fisheries |
| DSAs | Detailed Study Alternatives |
| DWR | Division of Water Resources (formerly Water Quality) |
| EA | Environmental Assessment |
| EEP | Ecosystem Enhancement Program |
| EFH | Essential Fish Habitat |
| EIS | Environmental Impact Statement |
| EJ | Environmental Justice |
| EMC | Environmental Management Commission |
| EO | Executive Order |
| ESA | Endangered Species Act |
| ESMP | Endangered Species Management Plan |
| ETDM | Efficient Transportation Decision-Making |
| FAA | Federal Aviation Administration |
| FEIS | Final Environmental Impact Statement |
| FEMA | Federal Emergency Management Agency |
| FERC | Federal Energy Regulatory Commission |
| FHWA | Federal Highway Administration |
| FIP | Flood Insurance Program |
| FOIA | Freedom of Information Act |
| FONSI or FNSI | Finding of No Significant Impact |
| FPPA | Farmland Protection Policy Act |
| FRA | Federal Railroad Administration |
| FSC | Federal Species of Concern |
| FTA | Federal Transit Administration |
| GIS | Geographical Information Systems |
| HEU | Human Environment Unit (formerly OHE) |
| HNI | Highway Needs Inventory |
| HQW | High Quality Waters |
| HSCB | Hazardous Spill Catch Basin |
| HUC | Hydrologic Unit Code |
| IAG | Inter-Agency Agreement |
| ICA | Immediate Corrective Action |
| ICE | Indirect and Cumulative Effects [Assessment] |
| ICI | Indirect and Cumulative Impact [Analysis] |
| ILT | Inter-Agency Leadership Team |
| IP | Individual Permit |
| ISTEA | Intermodal Surface Transportation Efficiency Act of 1991 |
| LEDPA | Least Environmentally Damaging Practicable Alternative |
| LOS | Level of Service |
| LRTP | Long-Range Transportation Plan |
| MA-NLAA | May Affect/Not Likely to Adversely Affect |
| MBTA | Migratory Bird Treaty Act |
| MIT | Merger Implementation Team |
| MPO | Metropolitan Planning Organization |
| MSATs | Mobile Source Air Toxics |
| MTT | Merger Training Team |
| NAC | Noise Abatement Criteria |
| NAGPRA | Native American Graves Protection and Repatriation Act |
| NCAC | North Carolina Administrative Code |
| NC-CREWS | North Carolina Coastal Region Evaluation of Wetland Significance |
| NCDCR | North Carolina Department of Cultural Resources |
| NCDENR | North Carolina Department of Environment and Natural Resources |
| NCDOC | North Carolina Department of Commerce |
| NCDOT | North Carolina Department of Transportation |
| NCFS | North Carolina Forest Service |
| NCNHP | North Carolina Natural Heritage Program |
| NCTA | North Carolina Turnpike Authority |
| NEPA | National Environmental Policy Act of 1969 |
| NEU | Natural Environment Unit (formerly ONE) |
| NHPA | National Historic Preservation Act |
| NHS | National Highway System |
| NMFS | National Marine Fisheries Service |
| NO2 | Nitrogen Dioxide |
| NOAA | National Oceanic and Atmospheric Administration |
| NOI | Notice of Intent |
| NOV | Notice of Violation |
| NOx | Nitrogen Oxides |
| NPDES | National Pollution Discharge Elimination System |
| NPS | National Park Service |
| NR | National Register |
| NRCS | Natural Resources Conservation Service |
| NRTR | Natural Resources Technical Report |
| NSW | Nutrient Sensitive Waters |
| NWI | National Wetland Inventory |
| O/D | Origin/Destination Study |
| O3 | Ozone |
| OBTF | Outer Banks Task Force |
| OHE | Office of Human Environment (See HEU) |
| ONE | Office of Natural Environment (See NEU) |
| ORW | Outstanding Resource Waters |
| OSA | Office of State Archeology |
| P/N | Purpose and Need |
| PDEA | Project Development and Environmental Analysis (NCDOT Branch) |
| PMii | Project Management Improvement Initiative |
| PN | Public Notice |
| PSHs | Pre-formed Scour Holes |
| RCBC | Re-enforced Concrete Box Culvert |
| RCRA | Resource Conservation and Recovery Act |
| ROD | Record of Decision |
| ROW | Right of Way |
| RPO | Rural Planning Organization |
| RTK | Right-to-Know |
| SAFETEA-LU | Safe, Accountable, Flexible and Efficient Transportation Equity Act - Legacy for Users |
| SASHTO | State Association of State and Highway Transportation Officials |
| SAVs | Submerged Aquatic Vegetation |
| SDEIS | Supplemental Draft Environmental Impact Statement |
| SDWA | Safe Drinking Water Act of 1944 |
| Section 10 | Of the Rivers and Harbors Act of 1899 |
| Section 106 | Of the National Historic Preservation Act of 1966 |
| Section 303(d) | Of the Clean Water Act of 1977 |
| Section 4(f) | Of the Department of Transportation Act of 1966 |
| Section 401 | Of the Clean Water Act of 1977 |
| Section 404 | Of the Clean Water Act of 1977 |
| Section 7 | Of the Endangered Species Act of 1973 |
| SEPA | State Environmental Policy Act |
| SFEIS | Supplemental Final Environmental Impact Statement |
| SHCs | Strategic Highway Corridors |
| SHPO | State Historic Preservation Officer |
| SIP | State Implementation Plan |
| SO2 | Sulfur Dioxide |
| SPUI | Single Point Urban Interchange |
| STRAHNET | Strategic Highway Network |
| T&E | Threatened and Endangered (Species) |
| TDM | Travel Demand Model |
| TEA-21 | Transportation Equity Act for the 21st Century of 1998 |
| TIP | Transportation Improvement Plan |
| TMP | Traffic Management Plan |
| TVA | Tennessee Valley Authority |
| US DHHS | United States Department of Health and Human Services |
| US DHS | United States Department of Homeland Security |
| US DOI | United States Department of Interior |
| US DOJ | United States Department of Justice |
| USACE or ACE | United States Army Corps of Engineers |
| USCG | United States Coast Guard |
| USDA | United States Department of Agricultural |
| USDOC | United States Department of Commerce |
| USDOT | United States Department of Transportation |
| USEPA or EPA | United States Environmental Protection Agency |
| USFS | United States Forest Service |
| USFWS or FWS | United States Fish and Wildlife Service |
| USGS | United States Geological Survey |
| UST | Underground Storage Tank |
| VPD | Vehicles Per Day |
| WRC | North Carolina Wildlife Resources Commission |
