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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 401 - 420 of 35811 results
  • Implementation of OMSBased Scour Prediction and RealTime Monitoring of Scour Processes for Alabama Bridges
    Implementation of OMS-Based Scour Prediction and Real-Time Monitoring of Scour Processes for Alabama Bridges
    Vasconcelos, Jose G. ;
    Anderson, J. Brian
    2025-04-01 | PDF
    This research compares the current methods used by ALDOT in developing bridge pier scour calculations, based on FHWA HEC-18, with alternative methods using the Observational Method for Scour and propose methods for pier scour real time monitoring. The work performed entailed the development of pier scour depth estimates in four Alabama bridges usin ...
  • Fuel Cell System Development for Heavy Duty Vehicles Brief
    Fuel Cell System Development for Heavy Duty Vehicles [Brief]
    Yang, Yu ;
    Yeh, Hen-Geul
    2025-04-01 | PDF
    As California advances its ambitious goals for transportation electrification to combat climate change, hydrogen-powered fuel cells are emerging as a viable solution for overcoming the challenges of heavy-duty vehicles, offering an efficient alternative to lithium-ion batteries because they produce minimal chemical, thermal, and carbon emissions. O ...
  • Evaluation of OneWay Flagging Operations
    Evaluation of One-Way Flagging Operations
    Larson, Shawn ;
    Runyan, Samuel L
    2025-04-01 | PDF
    One-way flagging operations in Utah are a balance between meeting the needs of UDOT and contractors by allowing time and space on the roadway for work to be done, while also meeting the needs of the traveling public. Currently, UDOT predicts queue lengths and travel time for such operations by using traffic models in order to effectively plan and m ...
  • Evaluating Roadway Trash and Migration to Receiving Water Task Order 2
    Evaluating Roadway Trash and Migration to Receiving Water - Task Order #2
    CDM Smith
    2025-04-01 | PDF
    The overall goal of this study was to obtain information on trash generation and discharge from Significant Trash Generating Areas (STGAs) to determine the effectiveness of selected controls and demonstrate full trash capture efficiency. The study monitored eight STGAs with on-land visual trash assessments for general trash accumulation. In additio ...
  • Proactive Planning Tool to Reduce Wildfire Sedimentation Risks
    Proactive Planning Tool to Reduce Wildfire Sedimentation Risks
    David, Scott R ;
    Belmont, Patrick
    2025-04-01 | PDF
    The geospatial modeling framework includes Direct Geohazard Impact Tools, which estimate debris flow triggering rainfall intensities and sediment erosion along transportation corridors based on predicted wildfire burn severity scenarios, and Downstream Impact Tools, which assess sediment delivery from hillslope erosion and debris flows to river net ...
  • Geospatial Toolkit for Rapid Assessment of PostWildfire Sedimentation Risks to Infrastructure
    Geospatial Toolkit for Rapid Assessment of Post-Wildfire Sedimentation Risks to Infrastructure
    David, Scott R ;
    Belmont, Patrick
    2025-04-01 | PDF
    The UDOT Post-Wildfire Geohazard Assessment Toolkit is a GIS-based toolset designed to evaluate post-wildfire sediment hazards. The toolkit integrates precompiled geospatial datasets with user-supplied burn severity data to estimate debris flow probability, sediment production, and sediment delivery to river networks. The geospatial toolkit include ...
  • School Start Times Impact on Students Walking or Biking to School Safe Routes to School
    School Start Times Impact on Students Walking or Biking to School: Safe Routes to School
    Levin, Michael W. ;
    Nie, Jaoting
    2025-04-01 | PDF
    Some school districts schedule elementary schools with early start times for various reasons. Such start times sometimes necessitate travel before sunrise during winter months. Intuitively, this could potentially conflict with a desire for increased use of active transportation, e.g. from the Safe Routes to School program, to reduce motor vehicle t ...
  • Impact of Start Time on Students Walking and Biking to School Research Summary
    Impact of Start Time on Students Walking and Biking to School [Research Summary]
    Levin, Michael W.
    2025-04-01 | PDF
    Some school districts schedule elementary schools with early start times for various reasons. Such start times sometimes necessitate travel before sunrise during winter months. Intuitively, this could potentially conflict with a desire for increased use of active transportation, e.g. from the Safe Routes to School program, to reduce motor vehicle t ...
  • Investigation and Assessment of Effective Patching Materials for Concrete Bridge Decks
    Investigation and Assessment of Effective Patching Materials for Concrete Bridge Decks
    Rangaraju, Prasad
    2025-04-01 | PDF
    Periodic maintenance of bridge decks through patching repairs is an essential strategy to maintain an effective transportation network. However, poor performance of patched sections needs to be studied to develop appropriate material selection methodology and proper construction practices to achieve durable repairs. The principal objective of this ...
  • Evaluation of BMD Surface Mixtures with Conventional and High RAP Contents Under LaboratoryScale and FullScale Accelerated Testing
    Evaluation of BMD Surface Mixtures with Conventional and High RAP Contents Under Laboratory-Scale and Full-Scale Accelerated Testing
    Habbouche, Jhony ;
    Tong, Bilin
    2025-04-01 | PDF
    Balanced Mix Design (BMD) is an asphalt mixture design method that replaces some aspects of traditional volumetric design with performance testing for the most common distresses, such as rutting and cracking. This approach provides an opportunity to properly design and produce engineered asphalt mixtures, including those with higher reclaimed aspha ...
  • Development of a Database for Successfully Performing Pavement Sections in Louisiana Brief
    Development of a Database for Successfully Performing Pavement Sections in Louisiana [Brief]
    Liu, Jun
    2025-04-01 | PDF
    Louisiana Transportation Research Center (LTRC) is frequently tasked with conducting forensic investigations of asphalt concrete (AC) pavement sections that have failed to meet performance expectations. However, thus far there have been limited efforts to identify and extract insights from pavement sections that have consistently surpassed expectat ...
  • Influence of Internal Curing on Concretes Permeability in Simulated Field Conditions
    Influence of Internal Curing on Concrete’s Permeability in Simulated Field Conditions
    Liu, Zhen ;
    Milla, Jose
    2025-04-01 | PDF
    The curing conditions stated in the AASHTO T358 standard require that concrete specimens remain fully saturated at all times in a moist room or cabinet prior to testing. These curing conditions obscure the true impact of internal curing. In order to assess the benefits of internal curing under more realistic condition, this study compared internall ...
  • Field Performance of FiberReinforced Concrete Overlays
    Field Performance of Fiber-Reinforced Concrete Overlays
    King, Daniel ;
    Yang, Bo
    2025-04-01 | PDF
    An increasing number of concrete overlay projects in Iowa and around the United States have used fiber-reinforced concrete (FRC) mixtures. Fibers provide residual strength to concrete mixtures, and concrete overlay design procedures currently assume that fiber reinforcement enhances fatigue life. A number of studies have suggested that fibers may o ...
  • Ahead of the Curve Course Updates and Conversions Summary
    Ahead of the Curve: Course Updates and Conversions [Summary]
    Bittner, Jason J.
    2025-04-01 | PDF
    The objective of this project is to update and transfer existing information into the AASHTO TTS format and make all courses 508 compliant. As part of the updates, it has been determined that it is necessary to develop an additional elective course on 508 compliance and accessibility.
  • An Investigation of the Factors Surrounding Crashes and Near Crashes of ADASEquipped Vehicles
    An Investigation of the Factors Surrounding Crashes and Near — Crashes of ADAS-Equipped Vehicles
    Reyes, Michelle L. ;
    Roe, Cheryl A
    2025-04-01 | PDF
    This project aimed to investigate the impact of advanced driver assistance systems (ADAS) in real-world crashes and near-crashes. The project considered the perspectives of motorists and law enforcement officers. A survey and interviews gathered information about the motorist's understanding of ADAS and the characteristics of the incident and the v ...
  • Job Access Agency Cost and VMT Impacts of Offering Microtransit Alongside Fixedroute Transit
    Job Access, Agency Cost, and VMT Impacts of Offering Microtransit Alongside Fixed-route Transit
    Hyland, Michael ;
    Pike, Susan
    2025-04-01 | PDF
    Public transit ridership has declined in major US cities over the past decade. Integrating traditional fixed-route transit with flexible microtransit has been proposed to enhance ridership, mobility, accessibility, and sustainability. This project surveyed California transit agencies on their microtransit services to identify challenges to integrat ...
  • The Effects of the COVID19 Pandemic on Transit in the San Francisco Bay Area
    The Effects of the COVID-19 Pandemic on Transit in the San Francisco Bay Area
    Lee, Richard W. ;
    Reinke, David B.
    2025-04-01 | PDF
    This report presents the findings from our study for the California State Assembly Transportation Committee on the effects of the COVID-19 pandemic on Bay Area Transit. The study consisted of a review of the literature on the effects of the pandemic on transit in the US, a detailed look at changes in ridership and economics for Bay Area transit age ...
  • The Effects of the COVID19 Pandemic on Transit in the San Francisco Bay Area Summary
    The Effects of the COVID-19 Pandemic on Transit in the San Francisco Bay Area [Summary]
    Lee, Richard W. ;
    Reinke, David B.
    2025-04-01 | PDF
    This report presents the findings from our study for the California State Assembly Transportation Committee on the effects of the COVID-19 pandemic on Bay Area Transit. The study consisted of a review of the literature on the effects of the pandemic on transit in the US, a detailed look at changes in ridership and economics for Bay Area transit age ...
  • Synthesis of Feasibility Analysis of UltraHigh Performance Concrete for Prestressed Concrete Bridge Application
    Synthesis of Feasibility Analysis of Ultra-High Performance Concrete for Prestressed Concrete Bridge Application
    Wan, Zhe ;
    Newtson, Craig M.
    2025-04-01 | PDF
    UHPC is an advanced construction material characterized by exceptional compressive strength, enhanced tensile properties, and superior durability. Where prestressed concrete girders are used in New Mexico’s bridge infrastructure, integrating UHPC offers a cost-effective and sustainable solution to enhance structural strength, longevity, and resilie ...
  • Volumetric Measurement of Salt Piles Using Photogrammetry LiDAR and Depth Cameras
    Volumetric Measurement of Salt Piles Using Photogrammetry, LiDAR, and Depth Cameras
    Mohammadi, Abbas ;
    Mohammadi, Pouria
    2025-04-01 | PDF
    This report presents the findings of a study conducted by the Utah Department of Transportation (UDOT) to evaluate advanced volumetric measurement technologies for accurately assessing road salt piles. The motivation for this study stems from the limitations of traditional methods, such as visual estimation and truckload weighing, which are prone t ...
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