The US Transportation Collection consists of documents from across all transportation modes with specific focus on research reports from US DOT, state DOTs, and other transportation organizations.
Bookmark this collection: https://rosap.ntl.bts.gov/collection_ust or https://doi.org/10.21949/1530857.
Like many agencies, the Alabama Department of Transportation (ALDOT) uses the AASHTO 1993 Design Guide as the basis for pavement thickness design in Alabama. The design software, DARWin, is no longer supported by AASHTO, causing a need for an Alabama-specific version of the software that can be used by ALDOT and its consultants in modern Windows-ba
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United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
2024-06-01
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Motor vehicle traffic crashes are a leading cause of death of children. Of the 42,514 traffic fatalities in 2022 in the United States, 1,129 (3%) were children 14 and younger. Child traffic fatalities decreased by 6 percent from 2021 (1,200) to 2022 (1,129). An estimated 156,502 children were injured in traffic crashes in 2022, a 4-percent decrease
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The United States (U.S.) inland waterways system (also known as the backbone of the transportation logistic system) directly connects 28 states and plays a crucial role in our nation’s competitiveness and economic growth supporting efficient, safe, and sustainable transport for multiple commodities including agriculture, chemicals, and building mat
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The report is designed to be put into action to enable field staff through the digital transformation. In preparing for the report, the project team was guided by an understanding that the success of MDOT’s digital delivery efforts is about more than introducing new technology into everyday use. Just as important are considerations about people and
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There is strong evidence to support incorporating arts, culture, and creative placemaking into transportation practices to improve engagement outcomes, mitigate impacts to communities, and build trust between communities and institutions. However, general confusion around the role arts and culture can and should play in transportation planning, plu
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Connected vehicles (CVs) are equipped with advanced technologies that allow them to communicate with infrastructure, other vehicles, and external systems. Meanwhile, transportation agencies maintain networks of road weather information systems (RWIS) that monitor weather and pavement surface conditions and communicate these conditions to agency per
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Massachusetts is home to millions of trees located not only in forests but also along streets and roadways in urban, suburban, and rural environments. The people living in these communities rely on street trees to provide necessary ecosystem services, such as shading and cooling, or stormwater mitigation. MassDOT has developed a comprehensive capit
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Asphalt concrete pavement surrounding utility structure covers is prone to settlement, cracking, breaking up over time, and potholing, and these distresses are particularly common in wet-freeze climates (e.g., Minnesota). Several factors contribute to their formation, including design requirements, collar material type and cut shape, construction p
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This report investigates the restraint at the top of the column of non-integral intermediate bents with closed diaphragms, a common connection configuration utilized by the MoDOT. Although closed diaphragms inherently possess some level of rotational restraint, the current design approach considers this type of connection as free, resulting in the
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Public transportation plays a fundamental role in the livability of communities of all sizes. The Rural Transit Fact Book provides information on transit service availability and cost to help the transit industry in the United States provide efficient and effective service to meet rural community mobility needs. Financial and operating statistics c
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United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
2024-06-01
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There were 716 fewer people killed in motor vehicle traffic crashes on U.S. roadways during 2022, a 1.7-percent decrease from 43,230 in 2021 to 42,514 in 2022. The fatality rate per 100 million vehicle miles traveled (VMT) decreased by 3.6 percent from 1.38 in 2021 to 1.33 in 2022. The estimated number of people injured on our roadways decreased in
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This report investigates the restraint at the top of the column of non-integral intermediate bents with closed diaphragms, a common connection configuration utilized by the MoDOT. Although closed diaphragms inherently possess some level of rotational restraint, the current design approach considers this type of connection as free, resulting in the
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The New Jersey Department of Transportation (NJDOT) engaged Cambridge Systematics to research Complete Streets best practices and assess New Jersey’s existing Complete Streets activities. The Complete Streets concept is comprised of approaches to planning, designing, and operating roadways and rights-of-way with all road users in mind, making the t
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Thin fiber reinforced concrete (FRC) pavements and overlays can be economical for low- and moderate-traffic volume roads. Due to insufficient concrete cover thickness, thin concrete pavements or overlays cannot accommodate dowel bars that are typically used in conventional thick concrete pavements. The critical distress for such applications is the
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Weathering steel enhances corrosion-resistant steel features over conventional steel when a patina properly forms on the weathering steel surface. Weathering steel is a low-carbon steel of less than 0.3 percent carbon by weight. The steel material’s chemical composition includes other alloying elements such as nickel, copper, and chromium. These co
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A traffic impact study may be required for proposed development projects that generate significant vehicular traffic as a result of the development. The purpose of the Traffic Impact Analysis (TIA) is to identify the adequacy of the existing transportation infrastructure to accommodate any changes in trips generated by a proposed development/redeve
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Alabama Highway 5 is a farm-to-market road built over an expansive clay subgrade. Moisture fluctuations cause the soil to shrink and swell, resulting in severe pavement distress. The purpose of this study was to recommend and evaluate remediation strategies that can be implemented on AL 5 and other similar roadways that are affected by swelling cla
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This project developed a cement-treated base (CTB) thickness design procedure for the Illinois Department of Transportation based on CTB fatigue (stress ratio criterion). The researcher developed a comprehensive ILLI-PAVE database for a range of thickness design inputs (7-day compressive strength, CTB thickness, and subgrade modulus). A CTB flexura
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This report is written in response to the State of California Department of Transportation (Caltrans), Division of Aeronautics, relating to the need to update the 2011 version of the California Airport Land Use Planning (ALUP) Handbook. The purpose of this technical report and its supplementary materials is to provide a robust scientific foundation
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For the Nebraska Department of Transportation (NDOT), the Nebraska Winter Severity Index (NEWINS) provided an independent framework to calculate a winter season’s severity by categorizing individual winter storms. However, one of the greatest limitations of NEWINS is that it is not predictive. Thus, this study builds on the previously developed NEW
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