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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 861 - 880 of 35448 results
  • 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 ...
  • MobileDevice Data NonMotorized Traffic Monitoring and Estimation of Annual Average Daily Bicyclist and Pedestrian Flows
    Mobile-Device Data, Non-Motorized Traffic Monitoring, and Estimation of Annual Average Daily Bicyclist and Pedestrian Flows
    Barman, Simanta ;
    Levin, Michael W.
    2024-06-01 | PDF
    People who walk and bike are the most vulnerable road users. However, understanding where they walk and bike requires continual data monitoring. Traditional methods rely on physical sensors in the infrastructure to detect the presence of pedestrians and bicyclists. However, these are expensive to deploy and only detect road users at the specific lo ...
  • 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 ...
  • 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 ...
  • Evaluating Arkansas Weathering Steel Bridge Performance
    Evaluating Arkansas Weathering Steel Bridge Performance
    Gonzalez, Yessenia ;
    Heymsfield, Ernie.
    2024-06-01 | PDF
    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 ...
  • Thickness Design for CementTreated Base Pavements
    Thickness Design for Cement-Treated Base Pavements
    Thompson, Marshall
    2024-06-01 | PDF
    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 ...
  • 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 ...
  • Intermediate Bents Calculation of Restraint Factor
    Intermediate Bents— Calculation of Restraint Factor
    Orton, Sarah ;
    Elsisi, Alaaeldin
    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 ...
  • Design Coefficients of Friction for MoDOT PTFE Bearings
    Design Coefficients of Friction for MoDOT PTFE Bearings
    Nejad, Saeed ;
    McGormley, Jonathan C.
    2024-06-01 | PDF
    This report evaluates the design coefficients of friction for polytetrafluoroethylene (PTFE) bearings, identifying key influencing parameters through a literature review and a detailed test program. Seven parameters were studied: PTFE material and surface types, size, contact pressure, temperature, sliding speed, and surface contamination. The anal ...
  • 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 ...
  • Design Coefficients of Friction for MoDOT PTFE Bearings Brief
    Design Coefficients of Friction for MoDOT PTFE Bearings [Brief]
    Wiss, Janney, Elstner Associates, Inc.
    2024-06-01 | PDF
    This report evaluates the design coefficients of friction for polytetrafluoroethylene (PTFE) bearings, identifying key influencing parameters through a literature review and a detailed test program. Seven parameters were studied: PTFE material and surface types, size, contact pressure, temperature, sliding speed, and surface contamination. The anal ...
  • Evaluate Geophysical Methods to Detect Underground Voids
    Evaluate Geophysical Methods to Detect Underground Voids
    Cai, Mingwei ;
    Li, Tairan
    2024-06-01 | PDF
    Four geophysical methods were comparatively assessed for their ability to detect subsurface anomalies/voids, namely, Electrical Resistivity Tomography (ERT), Multichannel Analysis of Surface Waves (MASW), Ground Penetrating Radar (GPR), and Full-Waveform Inversion (FWI). We found that: a. ERT is well-suited for detecting and localizing subsurface a ...
  • 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 ...
  • Evaluation of Remediation Strategies for ShrinkSwell Clays in Western Alabama
    Evaluation of Remediation Strategies for Shrink-Swell Clays in Western Alabama
    Anderson, J. Brian ;
    Jackson, Dan T
    2024-06-01 | PDF
    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 ...
  • 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 ...
  • 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 ...
  • Traffic Safety Facts 2021 Data Race and Ethnicity
    Traffic Safety Facts 2021 Data: Race and Ethnicity
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-06-01 | PDF
    This fact sheet reports data on traffic fatalities by race and ethnicity, which might help develop countermeasures for those at risk. The term “race-ethnicity” is used to refer to the combined classification of race and ethnicity data. Of the 43,230 traffic fatalities in 2021, White people accounted for 50 percent while Black or African American pe ...
  • 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 ...
  • Development of a SMS Rollout Plan and Evaluation
    Development of a SMS Rollout Plan and Evaluation
    Dadi, Gabriel B. ;
    Nassereddine, Hala
    2024-06-01 | PDF
    Many state transportation agencies have introduced safety management systems (SMSs) to improve employee safety and health programs. These systems let employees quickly access safety and health policies, procedures, training, responsibilities, resources, and incident reporting tools, often electronically. Instituting a SMS is a critical step in adop ...
  • Trip Generation Study FastFood with DriveThrough Coffee Shops with DriveThrough
    Trip Generation Study Fast-Food with Drive-Through & Coffee Shops with Drive-Through
    Roark, Drew ;
    Oliver, Bill
    2024-06-01 | PDF
    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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