BTS | Dictionary

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: National Airspace System (FAA2) (FAA3) (FAA4) (FAA17) (FAA6) (FAA19) (FAA8)

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)

NAVAID: Navigational Aid (FAA2) (FAA4) (FAA17) (FAA7) (FAA8) (FAA12)

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)

Negative Contact: Used by pilots to inform Air Traffic Control (ATC) that: 1) Previously issued traffic is not in sight. It may be followed by the pilot's request for the controller to provide assistance in avoiding the traffic. 2) They were unable to contact ATC on a particular frequency. (FAA4)

NEPA: National Environmental Policy Act (FAA7)

Net Horsepower: The usable power output of an engine "as installed". Net horsepower is the gross horsepower minus the horsepower used to drive the alternator, water pump, fan, etc., at a specified rpm. (GSA2)

Net Income or Loss Before Income Taxes: The Operating Profit or (Loss) which is operating revenues less operating expenses less nonoperating income and expense produces the Net Income, but before "nonrecurring items." (BTS4)

Net Maximum Dependable Capacity: The gross electrical output measured at the output terminals of the turbine generator(s) during the most restrictive seasonal conditions, less the station service load. (DOE5)

Net Module Shipments: Represents the difference between module shipments and module purchases. When exported, incomplete modules and unencapsulated cells are also included. (DOE5)

Net Receipts: The difference between total movements into and total movements out of each PAD District by pipeline, tanker, and barge. (DOE5)

Net Tare Weight: The weight of an empty cargo-carrying piece of equipment plus any fixtures permanently attached. (MARAD2)

Net Ton Mile: The movement of revenue and/or non revenue freight a distance of one mile. Includes a reasonable portion of the weight of exclusive work equipment and motorcar trains moved one mile. (AAR1)

Net Tonnage: The net or register tonnage of a vessel is the remainder after deducting from the gross tonnage of the vessel the tonnage of crew spaces, master's accommodations, navigation spaces, allowance for propelling power, etc. It is expressed in tons of 100 cubic feet. (USGC4)

Net Weight: (See also Gross Weight) Weight of the goods alone without any immediate wrappings, (e.g., the weight of the contents of a tin can without the weight of the can). (TNDOT1)

NETS: Network of Employers for Traffic Safety (NHTSA6)

NETSIM: (Traffic) Network Simulation (TXDOT)

Network Navigable Inland Waterway: All navigable inland waterways open to public navigation in a given area. (TNDOT1)

New Look Bus: A bus with the predominant styling and mechanical equipment common to buses manufactured between 1959 and 1978. (APTA1)

New Vehicle: A vehicle which is offered for sale or lease after manufacture without any prior use. (49CFR37)

New Vehicle Storage: A Fleet Management System (FMS) inventory status indicating vehicles that are placed in storage when first received and are awaiting assignment. (GSA2)

NEXRAD: Next Generation Weather Radar (FAA19)

NFDC: National Flight Data Center (FAA4) (FAA17)

NFDD: National Flight Data Digest (FAA4)

NGA: National Governors' Association (FHWA10)

NGM: Agana Naval Air Station (FAA11)

NGPA: Natural Gas Policy Act (DOE1)

NGPL: Natural Gas Plant Liquids (DOE8)

NGVC: Natural Gas Vehicle Coalition (VDOT)

NHI: National Highway Institute (OFR1)

NHPN: National Highway Planning Network (FHWA8)

NHS: National Highway System (BTS2) (FHWA8) (FHWA11)

NHTSA: National Highway Traffic Safety Administration (BTS2) (MTMC1) (NHTSA5) (NHTSA4) (NHTSA6) (OFR1)

NICS: NAS Interfacility Communications System (FAA19)

Night: The hours between the end of evening civil twilight and the beginning of morning civil twilight or such other period between sunset and sunrise as may be specified by the appropriate authority. Note: Civil twilight ends in the evening when the center of the sun's disk is 6 degrees below the horizon and begins in the morning when the center of the sun's disk is 6 degrees below the horizon. (14CFR1) (FAA4)

Night: From 6:00 p.m. to 5:59 a.m. (NHTSA3)

NIMBY: Not In My Back Yard

NIMS: National Information Management System (FHWA7)

Nine Foot Contour Line: A meandering line not necessarily on the channel edge at which a depth of 9 feet is obtained at river stage low water reference plain. (TNDOT1)

NIP: National Inspection Plan (RSPA1)

NIPA: National Income and Product Accounts (BTS2)

NIST: National Institute of Standards and Technology (OFR1)

Nitrogen Oxides: A product of combustion of fossil fuels whose production increases with the temperature of the process. It can become an air pollutant if concentrations are excessive. (DOE6)

NM: Nautical Mile (FAA17)

NM&SA: National Moving & Storage Association (MTMC1)

NMAC: Near Midair Collision (FAA3)

NMCAC: National Motor Carrier Advisory Committee (MTMC1)

NMFC: National Motor Freight Classification (MARAD2)

NMFTA: National Motor Freight Traffic Association (MTMC1)

NMREC: National Maritime Resource Center (MARAD4)

NMS: National Maritime System (MARAD4)

NMSL: National Maximum Speed Limit (NHTSA6)

No Gyro Approach: A radar approach/vector provided in case of a malfunctioning gyro-compass or directional gyro. Instead of providing the pilot with headings to be flown, the controller observes the radar track and issues control instructions "turn right/left" or "stop turn" as appropriate. (FAA4)

NOAA: National Oceanic and Atmospheric Administration (USCG5)

Non Revenue Freight: Company materials and supplies transported without charge in freight trains of a particular railroad for its own use. (AAR1)

Non-Bulk Packaging: A packaging which has 1) A maximum capacity of 450 L (119 gallons) or less as a receptacle for a liquid; 2) A maximum net mass of 400 kg (882 pounds) or less and a maximum capacity of 450 L (119 gallons) or less as a receptacle for a solid; or 3) A water capacity of 454 kg (1000 pounds) or less as a receptacle for a gas as defined in 49CFR173.115. (49CFR171)

Non-Collision Accident: A motor vehicle accident which does not involve a collision. Non-collision accidents include jackknifes, overturns, fires, cargo shifts and spills, and incidents in which trucks run off the road. (FHWA2)

Non-Earthen Shore: A structure built of stone, brick, concrete, or other building materials, that borders a body of water and that is not otherwise classified. (DOI3)

Non-Fixed Guideway Directional Route Miles: The mileage operated by non-rail modes on fixed routes and schedules in mixed traffic right-of-way. (FTA1)

Non-Fixed Route: Service not provided on a repetitive, fixed-schedule basis along a specific route to specific locations. Demand response is the only non-fixed-route-mode. (APTA1)

Non-Motorist: Any person who is not an occupant of a motor vehicle in transport and includes the following: 1) Pedestrians, 2) Pedalcyclists, 3) Occupants of parked motor vehicles, 4) Others such as joggers, skateboard riders, people riding on animals, and persons riding in animal-drawn conveyances. (NHTSA3)

Non-Motorist Location: The location of non motorists at time of impact. Intersection locations are coded only if non motorists were struck in the area formed by a junction of two or more traffic ways. Non-intersection location may include non-motorists struck on a junction of a driveway/alley access and a named traffic way. Non-motorists who are occupants of motor vehicles not in transport are coded with respect to the location of the vehicle. (NHTSA3)

Non-Occupant: Any person who is not an occupant of a motor vehicle (e.g., pedestrian or pedalcyclist), or who is an occupant of a motor vehicle which is not in transport. (NHTSA1)

Non-Pilot Personnel: May include any of the following personnel: Rules, Regulations, Standards, Maintenance, Servicing, Inspection, Weather Service, Airport Management, Production-Design, Ground Signalman, Passenger, Driver of Vehicle, Flight Engineer, Radio Operator, Flight Instructor on ground, Operational Supervisor, Air Traffic Control, Airway Facilities, Pilot of another aircraft, Ground Crewman, Spectator, Third Pilot, Navigator, Flight Attendant, Dispatching and other flight personnel. (NTSB1)

Non-Port Terminal: Waterfront terminals individually located along the navigable rivers, having place identity but not otherwise classifiable as a regional distribution or subregional port. (TNDOT1)

Non-Precision Instrument Runway: A runway with an approved or planned straight-in instrument approach procedure which has no existing or planned precision instrument approach procedure. (FAA12)

Non-Radar Approach Control Tower: An airport traffic control tower (ATCT) providing approach control service without the use of radar. In other words, an ATCT at which air traffic control specialists are permitted to provide manual approach control service, as well as to handle takeoffs and landings. (FAA10) (FAA13)

Non-Regulated Trucking: A carrier which is exempt from economic regulation, e.g. exempt agricultural shipments and private trucking operations. (ATA2)

Non-Self Propelled: Vessels not containing within themselves the means for their own propulsion. (TNDOT1)

Non-Train Incident: An event arising from railroad operations but not from the movement of on-track equipment, which does not exceed the reporting threshold, and results in a death, a reportable injury, or a reportable occupational illness. (FRA3) (FRA4)

Non-Vehicle Maintenance: All activities associated with facility maintenance, including: administration; repair of buildings, grounds and equipment as a result of accidents or vandalism; operation of electric power facilities; and, maintenance of vehicle movement control systems; fare collection and counting equipment; structures, tunnels and subways; roadway and track; passenger stations, operating station buildings, grounds and equipment; communication systems; general administration buildings, grounds and equipment; and electric power facilities. (FTA1)

Noncoincidental Peak-Day Flow: The largest volume of gas delivered to a particular customer by a pipeline company in a single day during the year. (DOE1)

Noncollision Crash: A class of crash in which the first harmful event does not involve a collision with a fixed object, non-fixed object, or a motor vehicle. This includes overturn, fire/explosion, falls from a vehicle, and injuries in a vehicle. (NHTSA3)

Noncompliance: Failure to comply with a standard or regulation issued under 46 U.S.C. Chapter 43, or with a section of the statutes. (USCG1)

Noncurrent Liabilities: Non-current portion of long-term debt and of capital leases, advances to associated companies and other liabilities not due during the normal business cycle. (BTS4)

Nonfatal (Most Serious) Injured: Are nonfatally injured persons whose injury is classified as incapacitating (as defined in the "Manual On Classification of Motor Vehicle Traffic Accidents," American National Standards Institute (ANSI) D16.1-1989). States may receive information about these injuries on the accident report forms as incapacitating, incapacitating injury, incapacitated, disabled, carried from scene, severe injury, critical nonfatal, major injury, or other similar terms. (FHWA2)

Nonfatal Accident: A motor vehicle traffic accident that results in one or more injuries, but no fatal injuries. (FHWA1)

Nonfatal Alcohol Involvement Crash: Alcohol-related or alcohol-involved if police indicate on the police accident report that there is evidence of alcohol present. The code does not necessarily mean that a driver, passenger, or non-occupant was tested for alcohol. (NHTSA3)

Nonfatal Casualty: Injuries and occupational illnesses incurred during railroad operations and maintenance procedures. (FRA3)

Nonfatal Injury: A nonfatal injury is any traffic accident injury other than a fatal injury. (FHWA2) (FHWA5)

Nonfatal Injury Accident: A nonfatal injury accident is a traffic accident that results in nonfatal injuries. (FHWA5)

Nonfatal Injury Accident: Accident in which at least one person is injured, and no injury results in death. (NSC1)

Nonfatal Injury Accident Rate: The nonfatal injury accident rate is the number of nonfatal injury accidents per 100 million vehicle miles of travel. (FHWA5)

Nonfatally Injured Person: A nonfatally injured person is one who suffers a nonfatal injury in either a fatal or nonfatal injury traffic accident. (FHWA5)

Nonfatally Injured Persons Rate: The nonfatally injured persons rate is the number of nonfatally injured persons per 100 million vehicle miles of travel. (FHWA5)

Nonhub: A community enplaning less than 0.05 percent of the total enplaned passengers in all services and all operations in all communities within the 50 States, and District of Columbia, and other U.S. areas designated by the Federal Aviation Administration. (FAA2) (FAA14) (FAA15)

Nonmetropolitan: Households not located within Metropolitan Statistical Areas (MSA) as defined by the U.S. Office of Management and Budget. (DOE4) (DOE5)

Nonoperating Income and Expense: Interest income and expense, unusual foreign exchange gains or losses, and capital gains or losses in disposition or property and equipment. (BTS4)

Nonprecision Approach Procedure: A standard instrument approach procedure in which no electronic glide slope is provided. (14CFR1)

Nonpriority U.S. Mail: Mail bearing postage for surface transportation that goes by air on a space available basis at rates lower than those fixed for priority (i.e., air) mail. (BTS5)

Nonrecurring Items: Discontinued operations, extraordinary items and accounting changes income or loss. (BTS4)

Nonresident Commercial Driver's License: A commercial driver's license (CDL) issued by a State to an individual domiciled in a foreign country. (49CFR383)

Nonscheduled Air Transportation: Establishments primarily engaged in furnishing nonscheduled air transportation. Also included in this industry are establishments primarily engaged in furnishing airplane sightseeing services, air taxi services and helicopter passenger transportation services to, from, or between local airports, whether or not scheduled. (BOC1)

Nonscheduled Service: Revenue flights, such as charter flights, that are not operated in regular scheduled service, and all nonrevenue flights incident to such flights. (BTS4) (BTS5) (BTS6) (NTSB1)

Nontrespassers: A person who is lawfully on any part of railroad property which is used in railroad operations or a person who is adjacent to railroad premises when injured as a result of railroad operations. (FRA3)

Nontrespassers (Class D): Persons lawfully on that part of railroad property that is used in railroad operation (other than those herein defined as employees, passengers, trespassers, or contractor employees) and persons adjacent to railroad premises when they are injured as the result of the operation of a railroad. This class also includes other persons on vessels or buses, whose use arises from the operation of a railroad. (FRA2)

Nonvessel Operating Common Carrier (NVOCC): 1) A company operating as a freight forwarder involved in ocean-going vessel freight only. 2) A form of freight consolidation for the selling of space on ocean-going vessels. (BOC2)

Nonvessel Owning Carrier (NVOC): A firm which consolidates and disperses international containers that originate at, or are bound for, inland ports. (USTTA1)

NOPT: No Procedure Turn Required (14CFR1)

NOPUS: National Occupant Protection Use Survey (NHTSA6)

NORAD: North American Aerospace Defense Command (FAA3)

Nordo: See Lost Communications.

NORDO: No Radio (FAA4)

Normal Pool: The stage of an artificially impounded water body that prevails for the greater part of the year. (DOI3)

Normal Pool Elevation: Height in feet above sea level at which a section of the river is to be maintained behind the dam. (TNDOT1)

Normal Pool Stage: That level of the river maintained by the desired dam operations. (TNDOT1)

Nose Dive: Trailer tipped forward on its nose. (ATA1)

Nose'er In: To land by putting the bow of the boat into the bank. (TNDOT1)

Not Paved Surface: All surfaces other than asphalt or concrete. (DOI3)

NOTAM: Notice To Airmen (FAA2) (FAA4) (FAA7) (FAA19) (FAA8) (FAA13)

Notch: A void or opening or any place where barge head logs do not meet, where they are not even with each other, or where no other barge is faced to a barge. (TNDOT1)

Notes and Accounts Receivable: Current notes and accounts receivable which are reasonably expected to be amortized within one year. These receivables include passenger receivables for air travel to be performed both by the selling carrier and other airlines, for which the related liabilities (to passenger or to the performing air carrier) are included in the "air traffic liabilities" account. (BTS4)

Notice of Proposed Rulemaking (NPRM): A public notice of proposed regulations required by law, which allows for public comments and scheduling of public hearings. (USCG1)

Notice to Airmen (NOTAM): A notice containing information (not known sufficiently in advance to publicize by other means) concerning the establishment, condition, or change in any component (facility, service, or procedure of, or hazard to the national airspace system), the timely knowledge of which is essential to personnel concerned with flight operations. (FAA2) (FAA7) (FAA8)

Notice to Mariners: (See also Public Notice) A bulletin or information to mariners issued by the Coast Guard. (TNDOT1)

Notices to Airmen Publication (NTAP): A publication issued every 14 days, designed primarily for the pilot, which contains current Notice to Airmen (NOTAM) information considered essential to the safety of flight as well as supplemental data to other aeronautical publications. The contraction NTAP is used in NOTAM text. (FAA4)

NOX: Nitrogen Oxide (BTS2)

NOYS: National Organization for Youth Safety (NHTSA6)

NPIAS: National Plan of Integrated Airport Systems (BTS8) (FAA17) (FAA7) (FAA19)

NPP: National Priority Program (NHTSA6)

NPR: National Performance Review (NHTSA6) (NHTSA5)

NPRM: Notice of Proposed Rulemaking (NHTSA5) (NHTSA6) (USCG1)

NPTS: Nationwide Personal Transportation Survey (BTS2) (FHWA3)

NRC: National Research Council (BTS2)

NRC: Non-Reusable Container (49CFR171)

NRT: National Response Team (RSPA1)

NSBC: National Safety Belt Coalition (NHTSA6)

NSC: National Safety Council (ENO1)

NSDI: National Spatial Data Infrastructure (BTS2)

NSI: National Shipbuilding Initiative (MARAD4)

NSIDH: National System of Interstate and Defense Highways (MTMC1)

NSPI: National Spatial Data Infrastructure (BTS8)

NTACS: Nationwide Truck Activity Survey (BTS7) (FHWA7)

NTAP: Notices To Airmen Publication (FAA4)

NTARS: National Transportation Analysis Regions (FHWA8)

NTD: National Transit Database (FTA3)

NTGIS: National Transit Geographic Information System (FTA3)

NTLC: National Traffic Law Center (NHTSA6)

NTP: National Transportation Policy (FAA17)

NTS: National Transportation Statistics [Report] (BTS8)

NTS: National Transportation System (BTS8)

NTSB: National Transportation Safety Board (FAA2) (FAA3)

Numbered Vessel: An undocumented vessel numbered by a state with an approved numbering system or by the Coast Guard under Chapter 123 of title 46, U.S.C. (USCG2)

Numerous Targets Vicinity (Location): A traffic advisory issued by Air Traffic Control (ATC) to advise pilots that targets on the radar scope are too numerous to issue individually. (FAA4)

NVOC: Nonvessel Owning Carrier (USTTA1)

NVOCC: Non-Vessel Operating Common Carrier (RSPA2)

NWS: National Weather Service (FAA19) (FAA8)

NYPD BLUE: New York Police Department

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