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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 661 - 680 of 35440 results
  • A Preliminary EvidenceBased Approach for Forecasting Cut Slope Deterioration
    A Preliminary Evidence-Based Approach for Forecasting Cut Slope Deterioration
    Werley, Keara ;
    Walton, Gabriel
    2024-09-01 | PDF
    Constructed rock slopes may physically deteriorate over time, which can be represented with increasing rockfall frequency. Physical deterioration leads to performance deterioration, which corresponds to changes in slope risk through time. Thus, forecasting physical slope deterioration and therefore slope performance deterioration is critical to the ...
  • Impact of Imperfections Residual Stresses Erection FitUp and Distortion on Curved Steel Bridge Service Life
    Impact of Imperfections, Residual Stresses, Erection Fit-Up and Distortion on Curved Steel Bridge Service Life
    Hammett, Stephen T ;
    Moghadam, Sayed Mohamad Jalali
    2024-09-01 | PDF
    Curved steel girders experience large deflection and rotations during construction and service that can intensify the web breathing effect. In addition, the curvature-induced lateral forces in slender curved webs can lead to critical web boundary stresses that do not typically occur in straight bridges. These distortion mechanisms are amplified by ...
  • Motorcycle Helmet Use in 2023 Overall Results Traffic Safety Facts Research Note
    Motorcycle Helmet Use in 2023 – Overall Results [Traffic Safety Facts - Research Note]
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-09-01 | PDF
    Use of DOT-compliant motorcycle helmets was 73.8 percent in 2023, not statistically different at the 0.05 level from 66.5 percent in 2022. The 2023 estimate is the highest ever recorded. The 2023 data collection occurred during the usual timeframe of early June, immediately following the Click It or Ticket campaign. There were 945 motorcyclists obs ...
  • CrossModal Impact Assessment for Sustainable Transportation Networks
    Cross-Modal Impact Assessment for Sustainable Transportation Networks
    Boakye, Jessica ;
    Okte, Egemen
    2024-09-01 | PDF
    It is often difficult to compare different travel modes when it comes to assessing sustainability. That is because there are many factors guiding investment to different modes of transportation and these factors may not always be comparable from one mode to another. This study aims to develop a holistic impact measurement (HIM) methodology incorpor ...
  • ReUse Of Minnesota Waste Material In Sustainably Design Soils Part 2
    Re-Use Of Minnesota Waste Material In Sustainably Design Soils: Part 2
    Saftner, David ;
    Cai, Meijun
    2024-09-01 | PDF
    Minerals, forestry, agriculture, and industrial activities in Minnesota generate substantial by-products and waste. Strategies to reuse or recycle these can reduce landfill waste, enhance public health, conserve resources, and cut costs and emissions. Building on the frameworks by Johnson et al. (2017), Saftner et al. (2019), and Saftner et al. (20 ...
  • Roadway Cross Section Reconfiguration Responses to 14 Commonly Asked Questions
    Roadway Cross Section Reconfiguration: Responses to 14 Commonly Asked Questions
    Knapp, Keith ;
    Veneziano, David
    2024-09-01 | PDF
    The project described in this report was developed in response to a documented need for more readily available guidance related to decision-making about roadway cross section reconfigurations. More specifically, there was a need for information that might help during the decision-making process involved in converting four-lane undivided roadway cro ...
  • Roadway Cross Section Reconfiguration Responses to 14 Commonly Asked Questions Tech Brief
    Roadway Cross Section Reconfiguration: Responses to 14 Commonly Asked Questions [Tech Brief]
    Iowa State University. Institute for Transportation
    2024-09-01 | PDF
    This summary addresses some of the access management measures that might be considered when a four- to three-lane or other cross section conversion project is being implemented. Several access issues identified and discussed in the Road Diet Informational Guide (Knapp et al. 2014) are listed, and other measures included in the Iowa DOT Access Manag ...
  • OSTR Research Roundup September 2024
    OST-R Research Roundup: September 2024
    United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology
    2024-09-01 | OST-R Research Roundup | PDF
    News from across OST-R and its research community.
  • ActivityBased Model Implementation and Analysis Considerations
    Activity-Based Model Implementation and Analysis Considerations
    Macfarlane, Gregory S ;
    Atchley, Hayden
    2024-09-01 | PDF
    Tour-based and activity-based travel demand models are generally considered more theoretically robust compared to their trip-based counterparts, as activity-based models (ABMs) explicitly model individuals making travel choices in contrast to the aggregate nature of trip-based models. There have been a number of comparisons between trip- and activi ...
  • LowShrinkage UltraHighPerformance Concrete
    Low-Shrinkage Ultra-High-Performance Concrete
    Aljawad, Yasmeen ;
    Lequesne, Remy D.
    2024-09-01 | PDF
    Ultra-high-performance concrete (UHPC) has been used increasingly in the past decade due to its high strength, rapid strength gain, and enhanced durability. UHPC is a cement-based material that typically has a low w/cm ratio, high paste content, and a 2% volume fraction of 0.5-in. long, straight, high-strength steel fibers. Most commercially availa ...
  • Effectiveness of Automated Pavement Restriping Systems Phase I Cost Comparison Between Manual and Automated Systems
    Effectiveness of Automated Pavement Restriping Systems, Phase I: Cost Comparison Between Manual and Automated Systems
    Schrock, Steven D. ;
    Liu, Lanxi
    2024-09-01 | PDF
    The Kansas Department of Transportation (KDOT) is interested in finding a more efficient and accurate restriping system than the current system in use in order to save costs and/or accomplish the same work using fewer field personnel. Therefore, this report details the potential financial advantages for KDOT to deploy an automated pavement restripi ...
  • LowShrinkage UltraHighPerformance Concrete Summary
    Low-Shrinkage Ultra-High-Performance Concrete [Summary]
    Aljawad, Yasmeen ;
    Lequesne, Remy D.
    2024-09-01 | PDF
    Ultra-high-performance concrete (UHPC) has been used increasingly in the past decade due to its high strength, rapid strength gain, and enhanced durability. UHPC is a cement-based material that typically has a low w/cm ratio, high paste content, and a 2% volume fraction of 0.5-in. long, straight, high-strength steel fibers. Most commercially availa ...
  • Effectiveness of Automated Pavement Restriping Systems Phase I Cost Comparison Between Manual and Automated Systems Summary
    Effectiveness of Automated Pavement Restriping Systems, Phase I: Cost Comparison Between Manual and Automated Systems [Summary]
    Schrock, Steven D. ;
    Liu, Lanxi
    2024-09-01 | PDF
    The Kansas Department of Transportation (KDOT) is interested in finding a more efficient and accurate restriping system than the current system in use in order to save costs and/or accomplish the same work using fewer field personnel. Therefore, this report details the potential financial advantages for KDOT to deploy an automated pavement restripi ...
  • Understanding AI Risks in Transportation AI Assurance for Transportation Whitepaper Series
    Understanding AI Risks in Transportation: AI Assurance for Transportation Whitepaper Series
    United States. Department of Transportation. Highly Automated Systems Safety Center of Excellence
    2024-09-01 | PDF
    Our first AI Assurance (AIA) whitepaper, An Overview of AI Assurance for Transportation, was published in April 2024. One of the identified key areas for AIA research is AI risk assessment and mitigation, which has not been explored sufficiently in the past. To promote and accelerate research efforts to address AI risks, this whitepaper—as the seco ...
  • Evaluating Sedimentation Impacts to Freshwater Mussels
    Evaluating Sedimentation Impacts to Freshwater Mussels
    Zhu, Wenyu ;
    Deng, Baolin
    2024-09-01 | PDF
    Transportation system construction activities can cause increased suspended and redeposited solids in adjacent water systems, which may adversely impact freshwater mussels. The objectives of this study are to evaluate the impacts of suspended solids on juvenile mussels including to establish the impact thresholds, to assess the effects of sediment ...
  • First and Last Mile Connectivity for Missourians
    First and Last Mile Connectivity for Missourians
    Villagran, Alvaro ;
    Lauer, Peter
    2024-09-01 | PDF
    By closing gaps in transit systems or by complementing transportation services, first-last mile transportation services are integral in enabling access to employment opportunities as well as other key destinations. This research study examined first-last mile service programs across the United States and assessed existing conditions in Missouri to ...
  • Evaluating Sedimentation Impacts to Freshwater Mussels Research Summary
    Evaluating Sedimentation Impacts to Freshwater Mussels [Research Summary]
    Baolin, Deng
    2024-09-01 | PDF
    This project was to 1) evaluate the impacts of suspended solids on juvenile mussels, 2) assess the effects of sediment deposition on adult and subadult mussels, 3) develop a particle tracking model, and 4) evaluate the existing and potential mitigation approaches for mussel protection. The comprehensive research included a literature review, a Depa ...
  • First and Last Mile Connectivity for Missourians Research Summary
    First and Last Mile Connectivity for Missourians [Research Summary]
    Villagran, Alvaro
    2024-09-01 | PDF
    This report discusses first-last mile transportation with a focus on access to employment. The Project Team examined first-last mile transportation services in other states in a variety of contexts, as well as the existing transportation landscape in Missouri.
  • Grand Forks East Grand Forks Regional ITS Architecture Update Version 50
    Grand Forks - East Grand Forks Regional ITS Architecture Update: Version 5.0
    Hasan, MD Sharijad
    2024-09-01 | PDF
    The Grand Forks-East Grand Forks Regional Intelligent Transportation Systems (ITS) Architecture was developed under the leadership of the Grand Forks-East Grand Forks Metropolitan Planning Organization (GF-EGF MPO). This architecture has been updated three times since its original development—in 2008, 2014, and 2019. The goal of the GF-EGF regional ...
  • Lessening Density Requirement and Adjusting Density Pay Factors for Asphalt Pavements in Poor Sublayer Conditions
    Lessening Density Requirement and Adjusting Density Pay Factors for Asphalt Pavements in Poor Sublayer Conditions
    Kang, Kyubyung ;
    Lee, Jinwoong
    2024-09-01 | PDF
    Current quality control and quality assurance practices for asphalt pavements rely heavily on density (%Gmm) measurements, which are directly linked to pay adjustments. However, these practices can inadvertently encourage over-compaction, leading to issues such as aggregate segregation, crushing, and reduced pavement quality, especially under poor ...
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