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Keyword Definition
Intersection 1) A point defined by any combination of courses, radials, or bearings of two or more navigational aids. 2). Used to describe the point where two runways, a runway and a taxiway, or two taxiways cross or meet. (FAA4)
Intercity Truck A truck that carries freight beyond local areas and commercial zones.
Intercity Class I Bus As defined by the Bureau of Transportation Statistics, an interstate motor carrier of passengers with an average annual gross revenue of at least $1 million.
International Airport 1) Any airport designated by the Contracting State in whose territory it is situated as an airport of entry and departure for international air traffic. 2) An airport of entry which has been designated by the Secretary of Treasury or Commissioner of Customs as an international airport for customs service. 3) A landing rights airport at which specific permission to land must be obtained from customs authorities in advance of contemplated use. 4) Airports designated under the Convention on International Civil Aviation as an airport for use by international commercial air transport and/or international general aviation. (FAA4)
Infrastructure 1) In transit systems, all the fixed components of the transit system, such as rights-of-way, tracks, signal equipment, stations, park-and-ride lots, but stops, maintenance facilities. 2) In transportation planning, all the relevant elements of the environment in which a transportation system operates. (TRB1) 3) A term connoting the physical underpinnings of society at large, including, but not limited to, roads, bridges, transit, waste systems, public housing, sidewalks, utility installations, parks, public buildings, and communications networks.
Interstate Highway (Freeway or Expressway) A divided arterial highway for through traffic with full or partial control of access and grade separations at major intersections. (FHWA3)
IRR TIP A multi-year listing of road improvement projects programmed for construction by a BIA area office, with IRR Program funds, for the next 3-5 years. A separate IRR TIP is prepared for each State within the area office's jurisdiction.
Inspection and Maintenance (I/M) An emissions testing and inspection program implemented by States in nonattainment areas to ensure that the catalytic or other emissions control devices on in-use vehicles are properly maintained.
IRR Road/Bridge Inventory An inventory of BIA owned IRR and bridges.
IRR Inventory An inventory of roads which meet the following criteria: a) public roads strictly within reservation boundaries, b) public roads that provide access to lands, to groups, villages, and communities inwhich the majority of residences are Indian, c) public roads that serve Indian lands not within reservation boundaries, and d) public roads that serve recognized Indian groups, villages, and isolated communities not located within a reservation.
International Passenger Any person traveling on a waterborne public conveyance between the United States and foreign countries and between Puerto Rico and the Virgin Islands and foreign countries. (TNDOT1)
Intrastate Commerce Any trade, traffic, or transportation in any State which is not described in the term "interstate commerce." (49CFR390)
Isolated Rural Nonattainment and Maintenance Areas Areas that do not contain or are not part of any metropolitan planning area as designated under the transportation planning regulations. Isolated rural areas do not have Federally required metropolitan transportation plans or TIPs and do not have projects that are part of the emissions analysis of any MPO's metropolitan transportation plan or TIP. Projects in such areas are instead included in statewide transportation improvement programs. These areas are not donut areas.
Indian Tribal Government (ITG) Duly formed governing body of an Indian Tribe.
IRR Transportation Planning Funds Funds provided under 23 U.S.C., Section 204 (j), for transportation planning by ITGs.
Inland And Coastal Channels Includes the Atlantic Coast Waterways, the Atlantic Intracoastal Waterway, the New York State Barge Canal System, the Gulf Coast Waterways, the Gulf Intracoastal Waterway, the Mississippi River System (including the Illinois Waterway), the Pacific Coast Waterways, the Great Lakes, and all other channels (waterways) of the United States, exclusive of Alaska, that are usable for commercial navigation.
Indian Lands Indian reservation or Indian trust land or restricted Indian land which is not subject to fee title alienation without the approval of the Federal Government, or Indian and Alaska Native villages, group, or communities in which Indians and Alaskan Natives reside, whom the Secretary of the Interior has determined are eligible for services generally available to Indians under Federal laws specifically applicable to Indians.
Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA) Legislative initiative by the U.S. Congress that restructured funding for transportation programs. ISTEA authorized increased levels of highway and transportation funding from FY92-97 and increased the role of regional planning commissions/MPOs in funding decisions. The Act also required comprehensive regional and Statewide long-term transportation plans and places an increased emphasis on public participation and transportation alternatives.
Interstate Limited access divided facility of at least four lanes designated by the Federal Highway Administration as part of the Interstate System. (NHTSA3)
Interstate Highway Limited access, divided highway of at least four lanes designated by the Federal Highway Administration as part of the Interstate System.
Indian Tribe Means any Indian or Alaska Native tribe, band, nation, pueblo, village, or community that the Secretary of the Interior acknowledges to exist as an Indian tribe pursuant to the Federally Recognized Indian Tribe List Act of 1994, 25 U.S.C. 479a.
Indian Reservation Roads (IRR) Public roads that are located within or provide access to an Indian reservation or Indian trust land or restricted Indian land which is not subject to fee title alienation without the approval of the Federal Government, or Indian and Alaska Native villages, group, or communities in which Indians and Alaskan Natives reside, whom the Secretary of the Interior has determined are eligible for services generally available to Indians under Federal laws specifically applicable to Indians. Roads on the BIA Road System are also IRR roads.
Imports Receipts of goods into the 50 States and the District of Columbia from foreign countries and from Puerto Rico, the Virgin Islands, and other U.S. possessions and territories. (DOE3)
Intermodal The ability to connect, and the connections between, modes of transportation.
Intelligent Transportation Systems (ITS) The application of advanced technologies to improve the efficiency and safety of transportation systems.
Integrated Transportation and Land-Use Package (ITLUP) The Institute of Transportation Engineers (ITE), an international individual member educational and scientific association, is one of the largest and fastest-growing multimodal professional transportation organizations in the world. ITE members are traffic engineers, transportation planners and other professionals who are responsible for meeting society's needs for safe and efficient surface transportation through planning, designing, implementing, operating and maintaining surface transportation systems worldwide.
Interstate Maintenance (IM) The Interstate Maintenance (IM) program provides funding for resurfacing, restoring, rehabilitating and reconstructing (4R) most routes on the Interstate System.
IRR Program Stewardship Plan The plan which details the roles and responsibilities of the BIA, FHWA and ITGs in the administration and operation of the IRR Program.
Interstate Highway System (IHS) The system of highways that connects the principal metropolitan areas, cities, and industrial centers of the United States. Also connects the US to internationally significant routes in Canada and Mexico.
Interstate Commerce Trade, traffic, or transportation in the United States which is between a place in a State and a place outside of such State (including a place outside of the United States) or is between two places in a State through another State or a place outside of the United States. (49CFR390)
International Transportation Transportation between any place in the United States and any place in a foreign country; between places in the United States through a foreign country; or between places in one or more foreign countries through the United States. (49CFR171)
Intrastate Travel within the same state. (BOC3)

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