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N2O: Nitrous Oxide (BTS2)

NAA: National Airspace Analysis (FAA7)

NAAQS: National Ambient Air Quality Standards (FHWA8)

NACA: National Advisory Committee On Aeronautics (OST3)

NADA: National Automotive Dealers Association (GSA2)

NADIN: National Airspace Data Interchange Network (FAA19)

NADS: National Advanced Driver Simulator (NHTSA5)

NAFTA: North American Free Trade Agreement (BTS2)

NAGHSR: National Association of Governor's Highway Safety Representatives (NHTSA6)

NAGIS: National Airport Grant Information System (FAA7)

NAICS: North American Industry Classification System (BTS2)

NAILS: National Airspace Integrated Logistics Support (FAA19)

NAIMS: National Airspace Information System (BTS8)

NAM: North American Region (USTTA1)

Naphtha: A generic term applied to a petroleum fraction with an approximate boiling range between 122 and 400 degrees Fahrenheit. (DOE3)

Naphtha-Type Jet Fuel: A fuel in the heavy naphtha boiling range with an average gravity of 52.8 degrees American Petroleum Institute (API) and 20 to 90 percent distillation temperatures of 290 degrees to 470 degrees Fahrenheit, meeting Military Specification MIL-T-5624L (Grade JP-4). JP-4 is used for turbojet and turboprop aircraft engines, primarily by the military. Excludes ram-jet and petroleum rocket fuels. (DOE5) (DOE6)

NAPRS: National Airspace Performance Reporting System (FAA3)

NARACS: National Radio Communications System (FAA19)

Narrow Channel: Channel with very little room to spare. (TNDOT1)

Narrow Railway Gauge: Distance between the rails of a track less than 4 ft 8.5 inches. (DOI3)

NAS: Naval Air Station (FAA17)

NASA: National Aeronautics and Space Administration (FAA7) (OFR1)

NASBLA: National Association of State Boating Law Administrators (USCG1)

NASDAC: National Aviation Safety Data Analysis Center (FAA19)

NASIP: National Aviation Safety Inspection Program (RSPA1)

NASMAP: NAS Management Automation Program (FAA19)

NASP: National Airspace System Plan (FAA17) (FAA8)

NASPAC: National Airspace System Performance Analysis Capability (FAA17)

NASPALS: Nas Precision Approach and Landing System (FAA17)

NASS: National Accident Sampling System (NHTSA5) (NHTSA2)

NAT: North Atlantic Region (USTTA1)

Nation's Freight Bill: The amount spent annually on freight transportation by the nation's shippers; also represents the total revenue of all carriers operating in the nation. (ATA2)

National Airspace System (NAS): The common network of U.S. airspace; air navigation facilities, equipment, and services; airports or landing areas; aeronautical charts, information, and services; rules, regulations, and procedures; technical information, manpower, and material. Included are system components shared jointly with the military. (FAA4) (FAA8)

National Airspace System (NAS) Stage A: The en route Air Traffic Control (ATC) system's radar, computers and computer programs, controller plan view displays (Plan View Displays (PVD)/Radar Scopes), input/output devices, and the related communications equipment which are integrated to form the heart of the automated Instrument Flight Rules (IFR) air traffic control system This equipment performs Flight Data Processing (FDP) and Radar Data Processing (RDP). It interfaces with automated terminal system and is used in the control of en route Instrument Flight Rules (IFR) aircraft. (FAA4)

National Beacon Code Allocation Plan Airspace: Airspace over United States territory located within the North American continent between Canada and Mexico, including adjacent territorial waters outward to about boundaries of oceanic control areas (CTA)/Flight Information Regions (FIR). (FAA4)

National Boating Safety Advisory Council (NBSAC): A 21 member council, equally represented by industry, the public, and State Boating Law Administrators, with expertise, knowledge and experience in boating safety. The Council acts in an advisory or consulting capacity to the Commandant. (USCG1)

National Bridge Inspection Standards (NBIS): Federal regulations establishing requirements for inspection procedures, frequency of inspections, qualifications of personnel, inspection reports, and preparation and maintenance of a State bridge inventory. (FHWA6)

National Bridge Inventory (NBI): The aggregation of structure inventory and appraisal data collected to fulfill the requirements of the National Bridge Inspection Standards that each State shall prepare and maintain an inventory of all bridges subject to the National Bridge Inspection Standards. (FHWA6)

National Carrier Group: Air carrier groups with annual operating revenues between $100,000,000 and $1,000,000,000. (BTS4) (BTS5) (BTS6) (FAA11)

National Cooperative Highway Research Program (NCHRP): The cooperative research, development, and technology transfer (RD&T) program directed toward solving problems of national or regional significance identified by States and the FHWA, and administered by the Transportation Research Board, National Academy of Sciences. (23CFR420)

National Cooperative Transit Research and Development Program: A program established under Section 6a) of the Urban Mass Transportation Act of 1964, as amended, to provide a mechanism by which the principal client groups of the Urban Mass Transportation Administration can join cooperatively in an attempt to resolve near-term public transportation problems through applied research, development, testing, and evaluation. NCTRP is administered by the Transportation Research Board. (TRB1)

National Flight Data Center: A facility in Washington DC, established by Federal Aviation Administration (FAA) to operate a central aeronautical information service for the collection, validation, and dissemination of aeronautical data in support of the activities of government, industry, and the aviation community. The information is published in the National Flight Data Digest. (FAA4)

National Flight Data Digest: A daily (except weekends and Federal holidays) publication of flight information appropriate to aeronautical charts, aeronautical publications, Notices to Airmen, or other media serving the purpose of providing operational flight data essential to safe and efficient aircraft operations. (FAA4)

National Highway System (NHS): This system of highways designated and approved in accordance with the provisions of 23 U.S.C. 103b). (23CFR500)

National Highway Traffic Safety Administration (NHTSA): The Administration was established by the Highway Safety Act of 1970 (23 U.S.C. 401 note). The Administration was established to carry out a congressional mandate to reduce the mounting number of deaths, injuries, and economic losses resulting from motor vehicle crashes on the Nation's highways and to provide motor vehicle damage susceptibility and ease of repair information, motor vehicle inspection demonstrations and protection of purchasers of motor vehicles having altered odometers, and to provide average standards for greater vehicle mileage per gallon of fuel for vehicles under 10,000 pounds (gross vehicle weight). (OFR1)

National Income: The aggregate earnings of labor and property which arise in the current production of goods and services by the nation's economy. (DOE6)

National Inland Waterways Transport: Inland waterways transport between two places (a place of IWT loading/embarkment and a place of unloading/disembarking) located in the same country irrespective of the country in which the IWT vessel is registered. It may involve transit through a second country. (TNDOT1)

National Inland Waterways Transport Vessel: Inland Waterways Transport (IWT) vessel which is registered at a given date in the reporting country. (TNDOT1)

National Search and Rescue Plan: An interagency agreement which provides for the effective utilization of all available facilities in all types of search and rescue missions. (FAA4)

National Transit Database: (Formerly Section 15) A reporting system, by uniform categories, to accumulate mass transportation financial and operating information and a uniform system of accounts and records. The reporting and uniform systems shall contain appropriate information to help any level of government make a public sector investment decision. The Secretary [of Transportation] may request and receive appropriate information from any source. (FTA1)

National Transportation System: An intermodal system consisting of all forms of transportation in a unified, interconnected manner to reduce energy consumption and air pollution while promoting economic development and supporting the Nation's preeminent position in international commerce. The NTS includes the National Highway System (NHS), public transportation and access to ports and airports. (APTA1)

Nationwide Personal Transportation Survey (NPTS): A nationwide home interview survey of households that provides information on the characteristics and personal travel patterns of the U.S. population. Surveys were conducted in 1969, 1977, 1983 and 1990 by the U.S. Bureau of Census for the U.S. Department of Transportation. (DOE6)

Nationwide Personal Transportation Survey (NPTS): A periodic national survey that provides comprehensive information on travel by the U.S. population, along with related socioeconomic characteristics of the tripmaker. The Nationwide Personal Transportation Survey (NPTS) is designed to allow an analysis of travel by characteristics of the trip (e.g., length, purpose, mode), the tripmaker (e.g., age, sex, household income) and the vehicle used (e.g., model year, vehicle type, make and model). NPTS surveys were conducted in 1969, 1977 and 1983 by the Bureau of Census (BOC) for the Department of Transportation (DOT). The 1990 NPTS was sponsored by a group of DOT agencies, specifically the Federal Highway Administration (FHWA), Federal Railroad Administration (FRA), National Highway Traffic Safety Administration (NHTSA), Office of the Secretary (OST), and the Federal Transit Administration (FTA). The survey was conducted for DOT by Research Triangle Institute. Information was collected on all trips taken by each household member age 5 and older during a designated 24-hour period, known as a "travel day," and on trips of 75 miles or more taken during the preceding 14-day period, known as the "travel period." The trip information was expanded to annual estimates of trips and travel. The survey encompassed trips on all modes of transportation for all trip purposes and all lengths. (FHWA3)

NATO: North American Treat Organization (AIA1)

Natural Gas: A naturally occurring mixture of hydrocarbon and nonhydrocarbon gases found in porous geologic formations beneath the earth's surface, often in association with petroleum. The principal constituent is methane. (AGA1)

Natural Gas: A mixture of hydrocarbon compounds and small quantities of various non-hydrocarbons existing in the gaseous phase or in solution with crude oil in natural underground reservoirs at reservoir conditions. (DOE6)

Natural Gas Marketed Production: Gross withdrawals of natural gas from production reservoirs, less gas used for reservoir repressuring; nonhydrocarbon gases removed in treating and processing operations; and quantities vented and flared. (DOE3)

Natural Gas Policy Act (NGPA) of 1978: Section 311 Construction, allows an interstate pipeline company to transport gas "on behalf of" any intrastate pipeline or local distribution company. Pipeline companies may expand or construct facilities used solely to enable this transportation service, subject to certain conditions and reporting requirements. (DOE1)

Natural Gas Transmission: Establishments engaged in the transmission and/or storage of natural gas for sale. (BOC1)

Natural Gas Transmission and Distribution: Establishments engaged in both the transmission and distribution of natural gas for sale. (BOC1)

Navigable Airspace: Airspace at and above the minimum flight altitudes prescribed in the Federal Aviation Regulations (FARs) including airspace needed for safe takeoff and landing. (FAA4)

Navigable Canal: Waterway built primarily for navigation. (TNDOT1)

Navigable Inland Waterway: A stretch of water, not part of the sea, over which vessels of a carrying capacity of not less than 50 tons can navigate when normally loaded. This term covers both navigable rivers and lakes and navigable canals. (TNDOT1)

Navigable Lake: Natural expanse of water open for navigation. (TNDOT1)

Navigable Pass: The water pass through which vessels may pass over a movable dam during periods of high water. The wickets of the dam are lowered to the riverbed and the water flows with little or no obstruction. Navigable passes are usually from 600 feet to 900 feet in width when the dam is lowered. These are found only in the Ohio and Illinois rivers. (TNDOT1)

Navigable River: Natural waterway open for navigation irrespective of whether it has been improved for that purpose. (TNDOT1)

Navigable Waters: The waters of the United States, including the territorial sea and such waters as lakes, rivers, streams; waters which are used for recreation; and waters from which fish or shellfish are taken and sold in interstate or foreign commerce. (49CFR171) (49CFR194)

Navigable Waters of the U.S.: Waters of the United States that are subject to the ebb and flow of the tide, and/or are presently used, or have been used in the past, or may be susceptible to use to transport interstate or foreign commerce. (TNDOT1)

Navigation Aid (NAVAID): Includes electrical and visual air navigation aids, lights, signs, and their supporting equipment. (FAA12)

Navigation Aid (NAVAID) Classes: Very high frequency omni-directional radio range (VOR), combined Very High Frequency Omni-Directional Radio Range (VOR) and tactical aircraft control and navigation (TACAN) navigational facility (VORTAC), and TACAN aids are classed according to their operational use. The three classes of NAVAIDs are: T-Terminal, L-Low altitude, H-High altitude. (FAA4)

Navigation Bulletin: See Public Notice.

Navigational Aid: (See also Air Navigation Facility) Any visual or electronic device airborne or on the surface which provides point-to-point guidance information or position data to aircraft in flight. (FAA4)

NAVMTO: Navy Material Transportation Office (MTMC1)

NAVSTAR: Navigation Satellite Timing and Ranging System (FHWA15)

NAWPF: National Aviation Weather Processing Facility (FAA8)

NBI: National Bridge Inventory (FHWA6)

NBIS: National Bridge Inspection Standards (FHWA6)

NBMB: National Bus Military Bureau (MTMC1)

NBSAC: National Boating Safety Advisory Council (USCG1)

NBTA: National Bus Traffic Association (BTS2)

NCAA: National Command Authority Aircraft - 747 (MTMC1)

NCAP: New Car Assessment Program (NHTSA5) (NHTSA6)

NCB: National Cargo Bureau (RSPA1)

NCDC: National Climatic Data Center (FHWA7)

NCF: National Control Facility (FAA17)

NCHRP: National Cooperative Highway Research Program (FHWA8)

NCHS: National Center for Health Statistics (FHWA1)

NCITD: National Committee On International Trade Documentation (MARAD2)

NCSA: National Center for Statistics and Analysis (NHTSA5)

NCTRP: National Cooperative Transit Research and Development Program (TRB1)

NDB: Nondirectional Beacon (FAA4) (FAA6) (FAA7)

NDR: National Driver Register (FHWA10) (NHTSA6)

NDRF: National Defense Reserve Fleet (MARAD4)

NDTA: National Defense Transportation Association (ENO1)

Near Midair Collision: An incident associated with the operation of an aircraft in which a possibility of collision occurs as a result of proximity of less than 500 feet to another aircraft, or a report is received from a pilot or flight crew member stating that a collision hazard existed between two or more aircraft. (FAA3) (FAA10)

NEC: Northeast Corridor (OST3)

Needle: A long stick of timber placed between the wickets of a movable dam to stop the leakage of water between the gates. A needle flat is a small barge used in transporting these timbers. (TNDOT1)

Negative: "No", or "Permission not granted", or "That is not correct." (FAA4)

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