The National Academies of Sciences, Engineering, and Medicine (NASEM), also known as the National Academies, is a congressionally chartered organization that serves as the collective scientific national academy of the United States. The name is used interchangeably in two senses: (1) as an umbrella term or parent organization for its three sub-divisions that operate as quasi-independent honorific learned society member organizations known as the National Academy of Sciences (NAS), the National Academy of Engineering (NAE), and the National Academy of Medicine (NAM); and (2) as the brand for studies and reports issued by the unified operating arm of the three academies originally known as the National Research Council (NRC). The National Academies also serve as public policy advisors, research institutes, think tanks, and public administration consultants on issues of public importance or on request by the government.
The United States Department of Transportation is one of the executive departments of the U.S. federal government. It is headed by the secretary of transportation, who reports directly to the president of the United States and is a member of the president's Cabinet.
The American Association of State Highway and Transportation Officials (AASHTO) is a standards setting body which publishes specifications, test protocols, and guidelines that are used in highway design and construction throughout the United States. Despite its name, the association represents not only highways but air, rail, water, and public transportation as well.
The Texas A&M Transportation Institute (TTI) in Bryan/College Station, Texas is a transportation research agency in the United States. The institute was created in 1950, primarily in response to the needs of the Texas Highway Department. TTI is a state agency and a member of the Texas A&M University System.
The American Public Transportation Association (APTA) is a nonprofit group of approximately 1,500 public and private sector member organizations that promotes and advocates for the interests of the public transportation industry in the United States.
The Federal Highway Administration (FHWA) is a division of the United States Department of Transportation that specializes in highway transportation. The agency's major activities are grouped into two programs, the Federal-aid Highway Program and the Federal Lands Highway Program. Its role had previously been performed by the Office of Road Inquiry, Office of Public Roads and the Bureau of Public Roads.
The Federal Transit Administration (FTA) is an agency within the United States Department of Transportation (DOT) that provides financial and technical assistance to local public transportation systems. The FTA is one of ten modal administrations within the DOT. Headed by an Administrator who is appointed by the President of the United States, the FTA functions through Washington, D.C. headquarters office and ten regional offices which assist transit agencies in all states, the District of Columbia, and the territories. Until 1991, it was known as the Urban Mass Transportation Administration (UMTA).
The National Bridge Inventory (NBI) is a database, compiled by the Federal Highway Administration, with information on all bridges and tunnels in the United States that have roads passing above or below them. That is similar to the grade-crossing identifier number database, compiled by the Federal Railroad Administration, which identifies all railroad crossings. The bridge information includes the design of the bridge and the dimensions of the usable portion. The data is often used to analyze bridges and to judge their condition. The inventory is developed for the purpose of having a unified database for bridges to ensure the safety of the traveling public, as required by the Federal Aid Highway Act of 1968. It includes identification information, bridge types and specifications, operational conditions, bridge data including geometric data and functional description, and inspection data. Any bridge more than 20 ft long used for vehicular traffic is included.
The Harmer E. Davis Transportation Library —also known as the Institute of Transportation Studies Library (ITSL), the Berkeley Transportation Library, or simply as the Transportation Library— is a transportation library at the University of California, Berkeley, devoted to transportation studies.
The Highway Capacity Manual (HCM) is a publication of the Transportation Research Board (TRB) of the National Academies of Sciences, Engineering, and Medicine in the United States. It contains concepts, guidelines, and computational procedures for computing the capacity and quality of service of various highway facilities, including freeways, highways, arterial roads, roundabouts, signalized and unsignalized intersections, interchanges, rural highways, and the effects of mass transit, pedestrians, and bicycles on the performance of these systems.
The Transportation Research Information Services online was a bibliographic database funded by sponsors of the United States Transportation Research Board (TRB), primarily the USA state departments of transportation and selected US federal transportation agencies. TRIS Online was hosted by the National Transportation Library under a cooperative agreement between the Bureau of Transportation Statistics and TRB. TRIS provided access to over 300,000 bibliographic records covering transportation research published in books, journal articles, technical reports and the media.
The National Transportation Library (NTL) maintains and facilitates access to information necessary for transportation decision-making in government and coordinates with public and private transportation libraries and information providers to improve information sharing among the transportation community. It is currently under the administration of the Bureau of Transportation Statistics (BTS).
The National Cooperative Highway Research Program (NCHRP) conducts research in problem areas that affect highway planning, design, construction, operation, and maintenance in the United States. Spearheaded by the Transportation Research Board (TRB), part of the National Academies of Sciences Engineering and Medicine, it is jointly supported by federal agencies, state departments of transportation (DOTs), and other nonprofit organizations.
The Surface and Air Transportation Program Extension Act of 2011 became a United States law when President Barack Obama signed the Act on September 16, 2011. The law extends taxes which fund federal highway expenditures through March and the Federal Aviation Administration through January. The Surface and Air Transportation Programs Extension Act of 2011 is a direct result of an agreement which was reached by the House and Senate majority leaders. This extension act was a top priority to Congress because federal highway and FAA funding was about to expire.
The Center for Transportation Research (CTR) is a research center affiliated with the Cockrell School of Engineering's Department of Civil, Architectural, and Environmental Engineering at The University of Texas at Austin in Austin, Texas. CTR is a research institution focused on transportation research and education.
Airport-to-airport mutual aid programs provide expert assistance and material support to an airport that has been affected by a natural or manmade disaster on a voluntary basis from other airports. The concept has been described as "airports helping airports."
The flail space model (FSM) is a model of how a car passenger moves in a vehicle that collides with a roadside feature such as a guardrail or a crash cushion. Its principal purpose is to assess the potential risk of harm to the hypothetical occupant as he or she impacts the interior of the passenger compartment and, ultimately, the efficacy of an experimental roadside feature undergoing full-scale vehicle crash testing.
An offset T-intersection is an at-grade road intersection where a conventional four leg intersection is split into two three-leg T-intersections to reduce the number of conflicts and improve traffic flow. Building the offset T-intersections as continuous green T-intersections, there is a single stop on the arterial road, only. A higher volume of through traffic on the cross road, or on unsignalized intersections, a rebuild to a conventional four-leg intersection may be adequate, also when the offset is a few feet only like staggered junctions causing slower traffic for a longer time on the arterial road.
The TRID Database is a database that combines the records from USA Transportation Research Board's Transportation Research Information Services (TRIS) database and the Organisation for Economic Co-operation and Development's (OECD) Joint Transport Research Centre's International Transport Research Documentation (ITRD) Database. The merging of these databases formed the world's largest and most comprehensive bibliographic resource on transportation research information. As of July 2020 TRID contains more than 1.25 million records of published and ongoing research, covering all modes and disciplines of air, ground, and water transportation—books, technical reports, conference proceedings, and journal articles. Many records contain links to full-text documents. The records in TRID are indexed with a standardized vocabulary from the Transportation Research Thesaurus (TRT) which has integrated both the TRIS and ITRD thesauri. Aspects of the Australian Road Research Board's ATRI and ROAD Thesauri are also incorporated.
Transportation in the United States is governed by laws and regulations of the federal government. The Department of Transportation is responsible for carrying out federal transportation policy, and the Department of Homeland Security is responsible for security in transportation.
