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Keyword Definition
Third party Logistics (3PL) Provider. A specialist in logistics who may provide a variety of transportation, warehousing, and logistics related services to buyers or sellers. These tasks were previously performed in house by the customer.
Throughput Total amount of freight imported or exported through a seaport measured in tons or TEUs.
Ton mile A measure of output for freight transportation; reflects weight of shipment and the distance it is hauled; a multiplication of tons hauled by the distance traveled.
Truckload (TL) Quantity of freight required to fill a truck, or at a minimum, the amount required to qualify for a truckload rate.
Twenty foot Equivalent Unit (TEU) The 8 foot by 8 foot by 20 foot intermodal container is used as a basic measure in many statistics and is the standard measure used for containerized cargo.
Telecommuting Communicating electronically (by telephone, computer, fax, etc.) with an office, either from home or from another site, instead of traveling to it physically.
Title VI Title VI of the Civil Rights Act of 1964. Prohibits discrimination in any program receiving federal assistance.
Transportation Conformity Process to assess the compliance of any transportation plan, program, or project with air quality implementation plans. The conformity process is defined by the Clean Air Act.
Transportation Control Measures (TCM) Transportation strategies that affect traffic patterns or reduce vehicle use to reduce air pollutant emissions. These may include HOV lanes, provision of bicycle facilities, ridesharing, telecommuting, etc. Such actions may be included in a SIP if needed to demonstrate attainment of the NAAQS.
Transportation Demand Management (TDM) Programs designed to reduce demand for transportation through various means, such as the use of transit and of alternative work hours.
Transportation Equity Act for the 21st Century (TEA-21) Authorized in 1998, TEA-21 authorized federal funding for transportation investment for fiscal years 1998-2003. Approximately $217 billion in funding was authorized, which was used for highway, transit, and other surface transportation programs.
Transportation Improvement Program (TIP) A document prepared by a metropolitan planning organization that lists projects to be funded with FHWA/FTA funds for the next one- to three-year period.
Transportation Infrastructure A federal credit program under which the USDOT may provide three forms of credit assistance - secured (direct) loans, loan guarantees, and standby lines of credit - for surface transportation projects of national or regional significance. The fundamental goal is to leverage federal funds by attracting substantial private and non-federal co-investment in critical improvements to the nation's surface transportation system.
Transportation Management Area (TMA) 1) All urbanized areas over 200,000 in population, and any other area that requests such designation. 2) An urbanized area with a population over 200,000 (as determined by the latest decennial census) or other area when TMA designation is requested by the Governor and the MPO (or affect local officials), and officially designated by the Administrators of the FHWA and the FTA. The TMA designation applies to the entire metropolitan planning area(s). (23CFR500)
Trust Fund A fund credited with receipts that are held in trust by the government and earmarked by law for use in carrying out specific purposes and programs in accordance with an agreement or a statute.
Tanker An oceangoing ship designed to haul liquid bulk cargo in world trade.
Ton-Mile (Water) The movement of one ton of cargo the distance of one statute mile. Domestic ton-miles are calculated by multiplying tons moved by the number of statute miles moved on the water (e.g., 50 short tons moving 200 miles on a waterway would yield 10,000 ton-miles for that waterway). Ton-miles are not computed for ports. For coastwise traffic, the shortest route that safe navigation permits between the port of origin and destination is used to calculate ton-miles.
Trafficway (Highway) Any right-of-way open to the public as a matter of right or custom for moving persons or property from one place to another, including the entire width between property lines or other boundaries.
Train Line Mileage The aggregate length of all line-haul railroads. It does not include the mileage of yard tracks or sidings, nor does it reflect the fact that a mile of railroad may include two or more parallel tracks. Jointly-used track is counted only once.
Train-Mile The movement of a train, which can consist of many cars, the distance of one mile. A train-mile differs from a vehicle-mile, which is the movement of one car (vehicle) the distance of one mile. A 10-car (vehicle) train traveling 1 mile is measured as 1 train-mile and 10 vehicle-miles. Caution should be used when comparing train-miles to vehicle-miles.
Transit Vehicle Includes light, heavy, and commuter rail; motorbus; trolley bus; van pools; automated guideway; and demand responsive vehicles.
Trolley Bus Rubber-tired electric transit vehicle, manually steered and propelled by a motor drawing current, normally through overhead wires, from a central power source.
Trust Funds Accounts that are designated by law to carry out specific purposes and programs. Trust Funds are usually financed with earmarked tax collections.
Tug Boat A powered vessel designed for towing or pushing ships, dumb barges, pushed-towed barges, and rafts, but not for the carriage of goods.
Travel Model Improvement Program (TMIP) TMIP supports and empowers planning agencies through leadership, innovation and support of planning analysis improvements to provide better information to support transportation and planning decisions.
Turner-Fairbank Highway Research Center (TFHRC) TFHRC provides FHWA and the world highway community with the most advanced research and development related to new highway technologies. The research focuses on providing solutions to complex technical problems through the development of more economical, environmentally sensitive designs; more efficient, quality controlled constructions practices; and more durable materials. The end result is a safer, more reliable highway transportation system.
Transportation Enhancement Activities (TE) Provides funds to the States for safe bicycle and pedestrian facilities, scenic routes, beautification, restoring historic buildings, renovating streetscapes, or providing transportation museums and visitors centers. 23 U.S.C. 101(a) and 133(b)(8).
Transportation Agreement Any contractual agreement for the transportation of natural and/or supplemental gas between points for a fee. (DOE5)
Transportation Bill The bill refers to the market value of all purchases of transportation services and facilities; it includes all domestic expenditures made by an economy for transportation purposes. Although the transportation bill does not reflect several significant non-market costs, it is a useful indicator of a country's transportation expenditures, and transportation analysts closely follow changes in the bill and its components. (BTS1)
Transportation Research Information Services (TRIS) The Transportation Research Board-maintained computerized storage and retrieval system for abstracts of ongoing and completed research, development, and technology transfer (RD&T) activities, including abstracts of RD&T reports and articles. (23CFR420)
Transport Movement of natural, synthetic, and/or supplemental gas between points beyond the immediate vicinity of the field or plant from which produced except 1) For movements through well or field lines to a central point for delivery to a pipeline or processing plant within the same state or 2) Movements from a citygate point of receipt to consumers through distribution mains. (DOE5)
Travel Advisory Program The Department of State manages a travel advisory program which publicizes 1) Travel warnings which are issued when State decides to recommend that Americans avoid travel to a certain country and 2) Consular information sheets, issued for every country, which advise travelers of health concerns, immigration and currency regulations, crime and security conditions, areas of unrest or instability, and the location of U.S. embassies or consulates. (USTTA1)
Travel Agencies Establishments primarily engaged in furnishing travel information and acting as agents in arranging tours, transportation, rental of cars, and lodging for travelers. (BOC1)
Transportation Administration and Support All activities associated with transportation administration, revenue vehicle movement control and scheduling including supervision and clerical support. (FTA1)
Tribal Control Schedule The implementing document for the Tribal TIP. The ITG may elect to develop the tribal control schedule under Self-Governance compact or Indian Self-Determination contract. The tribal control schedule is an accounting and project management tool that is developed from the tribal TIP. It contains detailed project and tasks information for all projects identified in the tribal TIP. Project information is included in the areawide control schedule without changing the total dollar amounts.
Tribal Lands Land held in trust for Indian people, restricted Indian land which is not subject to fee title alienation without the approval of the Federal Government, and fee lands owned by tribal governments.
Tribal Priority List A list of transportation projects which the ITG considers a high priority.
Tribal Technical Assistance Program Center (TTAP) These centers are responsible for providing transportation assistance to native Americans that includes, but is not limited to, circuit rider programs, providing training on intergovernmental transportation planning and project selection, and tourism recreation travel.
Tribal TIP A multi-year, financially constrained, list of proposed transportation projects to be implemented within or providing access to Indian country during the next 3-5 years. It is developed from the tribal priority list.
Total Benefit/Cost Ratio The sum of five categories of quantifiable project benefits divided by the anualized cost of the project.

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