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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.

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Showing 1521 - 1540 of 36873 results
  • Bridge Column Footing Performance and Seismic Retrofit Evaluation Considering SoilStructure Interaction
    Bridge Column Footing Performance and Seismic Retrofit Evaluation Considering Soil-Structure Interaction
    Stuedlein, Armin W. ;
    Higgins, Christopher C.
    2024-06-01 | PDF
    This project investigated a new seismic retrofitting technique for bridge column-footing substructure components considering the influence of soil-structure interactions (SSI). The seismic retrofitting technique uses titanium alloy bars to provide both confinement of the concrete column and a supplemental flexural tension load path. Laboratory and ...
  • Evaluation of Static and Dynamic No Right Turn on Red Signs at Traffic Signals
    Evaluation of Static and Dynamic No Right Turn on Red Signs at Traffic Signals
    Day, Christopher ;
    Sharma, Anuj
    2024-06-01 | PDF
    This study examined the operation of static and dynamic no right turn on red (NRTOR) signs at eight signalized intersections in Minnesota (six dynamic and two static). Driver compliance with the NRTOR indications were measured using video data. Most dynamic NRTOR sign locations were pedestrian-activated, with one location having additional time-of- ...
  • Evaluation of ALDOT Erosion Control Practices using Rainfall Simulation on Various Soil Types and Slope Gradients
    Evaluation of ALDOT Erosion Control Practices using Rainfall Simulation on Various Soil Types and Slope Gradients
    Cater, Jack R ;
    Ethridge, Jacob A
    2024-06-01 | PDF
    Construction sites rely on erosion control practices to protect bare slopes and prevent soil loss. This study used large scale rainfall simulators to evaluate various erosion control methods used by the Alabama Department of Transportation (ALDOT) on construction sites. The study included the construction of 12 rainfall simulators at the Auburn Uni ...
  • Development of a New Tool for Evaluating Infrastructure and Planning Impacts Related to Changes in Truck Traffic and Truck Technologies Final Report
    Development of a New Tool for Evaluating Infrastructure and Planning Impacts Related to Changes in Truck Traffic and Truck Technologies: Final Report
    Morgan, Curtis ;
    Warner, Jeffery
    2024-06-01 | PDF
    Researchers developed a set of integrated infrastructure-based and economic models to evaluate the infrastructure and planning impacts of increased numbers of automated trucks and truck platoons operating on Texas highways. As automated and platooned truck technologies evolve and their use in Texas highway corridors continues to grow, it is critica ...
  • Stormwater BMP Inspection and Maintenance Resource Guide
    Stormwater BMP Inspection and Maintenance Resource Guide
    Erickson, Andrew J ;
    Gulliver, John S.
    2024-06-01 | PDF
    Stormwater treatment practices, often referred to as stormwater best management practices (BMPs), require a substantial commitment to maintenance, including regular inspections and assessments. Existing regulations require governmental units to develop a systematic approach for ongoing inspection and maintenance to ensure that they are achieving th ...
    Supporting Files
  • Pavement Rehabilitation Analysis A LifeCycle Cost and LongTerm Performance Comparison of Full Depth Reclamation and Overlays Research Brief
    Pavement Rehabilitation Analysis: A Life-Cycle Cost and Long-Term Performance Comparison of Full Depth Reclamation and Overlays [Research Brief]
    Torres-Machi, Cristina ;
    Evers, Elijah
    2024-06-01 | PDF
    To reduce the environmental impact of transportation, Departments of Transportation (DOTs) are incorporating cold-recycling technologies such as Full-Depth Reclamation (FDR) as an alternative for pavement rehabilitation. One of the limitations hindering the deployment of FDR is the limited information available on the material properties of these m ...
  • Load and Resistance Factor Rating Methodology Recommendations for Missouri Bridges Research Summary
    Load and Resistance Factor Rating Methodology Recommendations for Missouri Bridges [Research Summary]
    Thiagarajan, Ganesh ;
    Myers, John
    2024-06-01 | PDF
    Traditionally, the Missouri Department of Transportation (MoDOT) has performed bridge load ratings using a method called load factor rating (LFR). With changes to bridge design and heavier vehicles traveling Missouri’s highways, MoDOT is working to adopt an updated system called load and resistance factor rating (LRFR). The primary goal of this stu ...
  • Effect of Geotechnical and Environmental Properties of Maryland Compost and Compost Amended Topsoils on Vegetation Establishment and Growth Summary
    Effect of Geotechnical and Environmental Properties of Maryland Compost and Compost Amended Topsoils on Vegetation Establishment and Growth [Summary]
    Aydilek, Ahmet
    2024-06-01 | PDF
    Poor structural properties and nutrient profiles of disturbed soils often require supplemental organic matter for promoting better vegetation establishment. Compost and compost-related products, when added to soils, have proven to enhance plant growth and improve infiltration of rainwater, thereby mitigating soil erosion and excess nutrient release ...
  • Implementation of SemiCircular Bend SCB Test for QCQA of Asphalt Mixtures
    Implementation of Semi-Circular Bend (SCB) Test for QC/QA of Asphalt Mixtures
    Mohammad, Louay ;
    Liu, Jun
    2024-06-01 | PDF
    The growing use of recycled asphalt materials in asphalt pavement poses durability concerns due to the replacement of virgin asphalt binder with recycled binder. The current volumetric-based Superpave mixture design is insufficient in addressing these concerns. To supplement conventional volumetric design, performance-based testing was introduced t ...
  • Structural Pavement Design Advancement in Alabama Phase 1 Software Development and Design Input Assessment
    Structural Pavement Design Advancement in Alabama Phase 1: Software Development and Design Input Assessment
    Bowers, Benjamin F. ;
    Timm, David H.
    2024-06-01 | PDF
    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 ...
  • Traffic Safety Facts 2022 Data Children
    Traffic Safety Facts 2022 Data: Children
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-06-01 | PDF
    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 ...
  • Data Analytics and Support Tools for Inland Waterways
    Data Analytics and Support Tools for Inland Waterways
    Golias, Mihalis ;
    Kaisar, Evangelos I.
    2024-06-01 | PDF
    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 ...
  • Construction Digital Delivery Technology Scan
    Construction Digital Delivery Technology Scan
    Ketterl, Mona ;
    Wilkerson, John
    2024-06-01 | PDF
    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 ...
  • Utilizing Arts and Culture to Mitigate the Negative Impacts of Transportation Infrastructure on Communities
    Utilizing Arts and Culture to Mitigate the Negative Impacts of Transportation Infrastructure on Communities
    Cidell, Julie L. ;
    Kayzar, Brenda
    2024-06-01 | PDF
    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 ...
  • Integration of Connected Vehicle and RWIS Technologies Summary
    Integration of Connected Vehicle and RWIS Technologies [Summary]
    Nlenanya, Inya
    2024-06-01 | PDF
    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 ...
  • Tree Protection for Street Corridor Development in Massachusetts
    Tree Protection for Street Corridor Development in Massachusetts
    Mahoney, Delia ;
    Kane, Brian
    2024-06-01 | PDF
    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 ...
  • Pavement Design Around Utilities Best Practice
    Pavement Design Around Utilities – Best Practice
    Lopez, Sarah ;
    Stempihar, Jeff
    2024-06-01 | PDF
    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 ...
  • Intermediate Bents Calculation of Restraint Factor Research Summary
    Intermediate Bents— Calculation of Restraint Factor [Research Summary]
    University of Missouri--Columbia
    2024-06-01 | PDF
    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 ...
  • Rural Transit Fact Book 2024
    Rural Transit Fact Book 2024
    Mattson, Jeremy ;
    Mistry, Dilip
    2024-06-01 | PDF
    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 ...
  • Overview of Motor Vehicle Traffic Crashes in 2022 Traffic Safety Facts Research Note
    Overview of Motor Vehicle Traffic Crashes in 2022 [Traffic Safety Facts - Research Note]
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-06-01 | PDF
    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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