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Keyword Definition
School Bus A passenger motor vehicle that is designed or used to carry more than 10 passengers, in addition to the driver, and, as determined by the Secretary of Transportation, is likely to be significantly used for the purpose of transporting pre-primary, primary, or secondary school students between home and school.
State-Designated Route A preferred route selected in accordance with U.S. DOT "Guidelines for Selecting Preferred Highway Routes for Highway Route Controlled Quantities of Radioactive Materials" or an equivalent routing analysis which adequately considers overall risk to the public. (49CFR171)
State Infrastructure Bank (SIB) A revolving fund mechanism for financing a wide variety of highway and transit projects through loans and credit enhancement. SIBs are designed to complement traditional Federal-aid highway and transit grants by providing States increased flexibility for financing infrastructure investments.
Smart Growth A set of policies and programs design to protect, preserve, and economically develop established communities and valuable natural and cultural resources.
State Transportation Improvement Program (STIP) A staged, multi-year, statewide, intermodal program of transportation projects, consistent with the statewide transportation plan and planning processes as well as metropolitan plans, TIPs, and processes.
Statewide Comprehensive Outdoor Recreation Plan (SCORP) A statewide recreation plan required by the Land and Water Conservation Fund Act of 1965. Addresses the demand for and supply of recreation resources (local, State, and Federal) within a State, identifies needs and new opportunities for recreation improvements, and sets forth an implementation program to meet the goals identified by its citizens and elected leaders. [National Park Service] NOTE: Metropolitan and statewide transportation plans plans should be coordinated with SCORPs.
Safety Management System A systematic process that has the goal of reducing the number and severity of transportation related accidents by ensuring that all opportunities to improve safety are identified, considered and implemented as appropriate.
Self-Propelled Vessel A vessel that has its own means of propulsion. Includes tankers, containerships, dry bulk cargo ships, and general cargo vessels.
Sub-Allocation An administrative distribution of funds from BIA Central Office down to the BIA area.
State Routing Agency An entity (including a common agency of more than one state such as one established by Interstate compact) which is authorized to use state legal process pursuant to 49 CFR 177.825 to impose routing requirements, enforceable by State agencies, on carriers of radioactive materials without regard to intrastate jurisdictional boundaries. This term also includes Indian tribal authorities which have police powers to regulate and enforce highway routing requirements within their lands. (49CFR171)
Serious Injury (Air Carrier/General Aviation) An injury that requires hospitalization for more than 48 hours, commencing within 7 days from the date when the injury was received; results in a bone fracture (except simple fractures of fingers, toes, or nose); involves lacerations that cause severe hemorrhages, or nerve, muscle, or tendon damage; involves injury to any internal organ; or involves second- or third-degree burns or any burns affecting more than 5 percent of the body surface.
Sponsor Any private owner of a public-use airport or any public agency (either individually or jointly with other public agencies) that submit to the Secretary of Transportation, in accordance with the Airport & Airway Improvement Act of 1982, an application for financial assistance. (FAA2)
State As defined in chapter 1 of Title 23 of the United States Code, any of the 50 States, comprising the United States, plus the District of Columbia and the Commonwealth of Puerto Rico. However, for some purposes (e.g., highway safety programs under 23 U.S.C. 402), the term may also include the Territories (the U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands) and the Secretary of the Interior (for Indian Reservations). For the purposes of apportioning funds under sections 104, 105, 144, and 206 of Title 23, United States Code, the term "State" is defined by section 1103(n) of the TEA-21 to mean any of the 50 States and the District of Columbia.
Surface Transportation Program (STP) Federal-aid highway funding program that funds a broad range of surface transportation capital needs, including many roads, transit, sea and airport access, vanpool, bike, and pedestrian facilities.
Shortline Railroad Freight railroads which are not Class I or Regional Railroads, that operate less than 350 miles of track and earn less than $40 million.
Stakeholders Individuals and organizations involved in or affected by the transportation planning process. Include federal/state/local officials, MPOs, transit operators, freight companies, shippers, and the general public.
Small Particulate Matter (PM-10) Particulate matter which is less than 10 microns in size. A micron is one millionth of a meter. Particulate matter this size is too small to be filtered by the nose and lungs.
Stakeholder Person or goup affected by a transportation plan, program or project. Person or group believing that are affected by a transportation plan, program or project. Residents of affected geographical areas.
State Planning and Research Funds (SPR) Primary source of funding for statewide long-range planning.
State Implementation Plan (SIP) Produced by the state environmental agency, not the MPO. A plan mandated by the CAA that contains procedures to monitor, control, maintain, and enforce compliance with the NAAQS. Must be taken into account in the transportation planning process.
Sources Refers to the origin of air contaminants. Can be point (coming from a defined site) or non-point (coming from many diffuse sources).[Stationary sources include relatively large, fixed facilities such as power plants, chemical process industries, and petroleum refineries. Area sources are small, stationary, non-transportation sources that collectively contribute to air pollution, and include such sources as dry cleaners and bakeries, surface coating operations, home furnaces, and crop burning. Mobile sources include on-road vehicles such as cars, trucks, and buses; and off-road sources such as trains, ships, airplanes, boats, lawnmowers, and construction equipment.
Stationary Source Relatively large, fixed sources of emissions (i.e. chemical process industries, petroleum refining and petrochemical operations, or wood processing).
Streetcars Relatively lightweight passenger railcars operating singly or in short trains, or on fixed rails in rights-of-way that are not always separated from other traffic. Streetcars do not necessarily have the right-of-way at grade crossings with other traffic.
Statewide Transportation Plan The official statewide intermodal transportation plan that is developed through the statewide transportation planning process.
State Transportation Agency The State highway department, transportation department, or other State transportation agency to which Federal-aid highway funds are apportioned. (23CFR420)
Sprawl Urban form that connotatively depicts the movement of people from the central city to the suburbs. Concerns associated with sprawl include loss of farmland and open space due to low-density land development, increased public service costs, and environmental degradation as well as other concerns associated with transportation.

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Updated: 03/21/2012
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