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Keyword Definition
Noise Standards 23 U.S.C. 109(i)
Nonresident Commercial Driver's License A commercial driver's license (CDL) issued by a State to an individual domiciled in a foreign country. (49CFR383)
National Scenic Trail (NST) A continuous, primarily nonmotorized route of outstanding recreation opportunity, established by Act of Congress. 16 U.S.C. 1241-51.
National Historic Trail (NHT) A historic or prehistoric route of travel of significance to the entire Nation. It must meet three criteria listed in Section 5(b)(11) of the National Trails System Act, and be established by Act of Congress. 16 U.S.C. 1241-51.
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.
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)
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 ITS Architecture A systems framework to guide the planning and deployment of ITS infrastructure. The national ITS architecture is a blueprint for the coordinated development of ITS technologies in the U.S. It is unlikely that any single metropolitan area or state would plan to implement the entire national ITS architecture.
Nonattainment Area (NAA) Any geographic area that has not met the requirements for clean air as set out in the Clean Air Act of 1990.
Nonoccupant (Automobile) Any person who is not an occupant of a motor vehicle in transport (e.g., bystanders, pedestrians, pedalcyclists, or an occupant of a parked motor vehicle).
National Scenic Byways Program (NSBP) Designates roads that have outstanding scenic, historic, cultural, natural, recreational, and archaeological qualities as All-American Roads or National Scenic Byways, and provides grants for scenic byway projects. 23 U.S.C. 162
National Environmental Policy Act of 1969 (NEPA) 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.
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)
National Ambient Air Quality Standards (NAAQS) Federal standards that set allowable concentrations and exposure limits for various pollutants. The EPA developed the standards in response to a requirement of the CAA. Air quality standards have been established for the following six criteria pollutants: ozone (or smog), carbon monoxide, particulate matter, nitrogen dioxide, lead, and sulfur dioxide.
Nitrogen Oxide Emissions Nitrogen oxides (NOx), the term used to describe the sum of nitric oxide (NO), nitrogen dioxide (N02) and other oxides of nitrogen, play a major role in the formation of ozone. The major sources of man﷓made NOx emissions are high﷓temperature combustion processes, such as those occurring in automobiles and power plants.
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)
Native American Local Technical Assistance Programs Primarily responsible for transportation related technology transfer to Native Americans through Tribal Technical Assistance Program (TTAP) Centers.
Natural Gas Policy Act of 1978 (NGPA) 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)
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 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 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 Trails System (NTS) The network of scenic, historic, and recreation trails created by the National Trails System Act of 1968. These trails provide for outdoor recreation needs, promote the enjoyment, appreciation, and preservation of open-air, outdoor areas and historic resources, and encourage public access and citizen involvement. 16 U.S.C. 1241-51.
National Highway System (NHS) This system of highways designated and approved in accordance with the provisions of 23 U.S.C. 103b). (23CFR500)
Notice of Funding Availability Written notice to the respective area tribes that the BIA area office has received contractible program funds.

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