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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 241 - 260 of 36336 results
  • Incident Management in Interstate Work Zones
    Incident Management in Interstate Work Zones
    Cottrell Jr Benjamin H.
    2025-10-01 | PDF
    Incidents in interstate work zones can create challenges for incident management, especially when temporary traffic barriers and limited shoulder pull-off areas are present. This project identified best practices for incident management in interstate work zones, including strategies to provide for the detection, response, and clearance of incidents ...
  • NondestructiveNoncontact Inspection Protocols and Technologies for Aging Mechanically Stabilized Earth and Modular Block Retaining Walls Volume II
    Nondestructive/Noncontact Inspection Protocols and Technologies for Aging Mechanically Stabilized Earth and Modular Block Retaining Walls, Volume II
    Maghiar, Marcel ;
    Maldonado, Gustavo O.
    2025-10-01 | PDF
    This volume is the second in a series. The other volume in the series is FHWA-GA-25-2217 Volume I. As Mechanically Stabilized Earth and Modular Block retaining walls age within Georgia's highway infrastructure, their stability and safety are critical concerns. Currently, unlike bridges, these retaining walls lack standardized inspection protocols, ...
  • Using Advanced Binder Rheological Parameters to Predict Cracking Potential of HotMix Asphalt Mixtures with Modified Binders
    Using Advanced Binder Rheological Parameters to Predict Cracking Potential of Hot-Mix Asphalt Mixtures with Modified Binders
    Al-Qadi, Imad L. ;
    Sulaiman, Abdulgafar O.
    2025-10-01 | PDF
    This study provides insights into the complexities of asphalt binder modifications and their impact on hot-mix asphalt (HMA)cracking potential. An experimental program was developed to assess the cracking potential of HMA from binder characteristics. Various binder types, including polymer-softener-modified binders, were considered. Rheological tes ...
  • Evaluation of Safety Performance of Rural Roundabouts Technical Summary
    Evaluation of Safety Performance of Rural Roundabouts [Technical Summary]
    Roy, Shibasish Dutta ;
    Schrock, Steven
    2025-10-01 | PDF
    The primary goal of this study was to assess how rural roundabouts in Kansas impact roadway safety. The study utilized comparison groups and a before-and after study as well as a thorough benefit-cost analysis to determine the return on investment for roundabouts in rural areas. This research also aimed to assess crash frequency at rural roundabout ...
  • Systematic and Quantitative Approaches to Assess the Probability of Extreme Weather and Resilience Risks for TxDOT Highways and Bridges
    Systematic and Quantitative Approaches to Assess the Probability of Extreme Weather and Resilience Risks for TxDOT Highways and Bridges
    Birt, Andrew ;
    Prozzi, Jorge
    2025-10-01 | PDF
    This research develops a quantitative framework to assess flood-related risks and resilience for Texas highways and bridges. The study reviewed current practices and gaps, applied GIS-based methods with statewide flood datasets, and evaluated exposure of pavements and bridges across multiple return periods and climate scenarios. Risk assessments qu ...
  • Equity in Transportation Payments A Study for the California Department of Transportation
    Equity in Transportation Payments: A Study for the California Department of Transportation
    Mata, Stacy ;
    Hamilton, Madi
    2025-10-01 | PDF
    This study identifies equity challenges in current transportation payment systems, specifically for transit, parking, and vehicle tolls. The methodology included comprehensive literature reviews, an inventory of 49 global transit systems, seven case studies, and expert interviews to assess payment accessibility, technical rules, interoperability, a ...
  • Phase II High Resolution Digital Elevation Models DEMs and StreetLevel Imagery for Rock Cut Slope Inventory and Rockfall Hazard Rating
    Phase II: High Resolution Digital Elevation Models (DEMs) and Street-Level Imagery for Rock Cut Slope Inventory and Rockfall Hazard Rating
    Admassu, Yonathan
    2025-10-01 | PDF
    Proactive management of geotechnical assets such as rock cut slopes along highways includes performing inventory and evaluating rockfall hazard ratings. Both activities are aimed at helping transportation agencies to proactively monitor and maintain rockfall prone rock cut slopes. Rock cut slope inventory involves locating rock cut slopes and colle ...
  • Modified Fiber Reinforced Concrete Repairs for Corroded Steel Beam Ends
    Modified Fiber Reinforced Concrete Repairs for Corroded Steel Beam Ends
    Provines, Jason T. ;
    Sharifi, Mary
    2025-10-01 | PDF
    One common form of costly bridge maintenance is repairing corroded steel beam ends under leaking joints. Recently, the University of Connecticut and the Connecticut Department of Transportation have developed a practical repair strategy in which shear studs are welded to undamaged sections of the corroded steel beam and then ultra-high-performance ...
  • 2025 Bringing Montanas History into the Future Modernizing MDTs Interpretive Marker System Data Management Plan
    2025 Bringing Montana’s History into the Future: Modernizing MDT’s Interpretive Marker System Data Management Plan
    Villwock-Witte, Natalie ;
    Clouser, Karalyn
    2025-10-01 | PDF
    Tabular and text data from fewer than 50 respondents were collected. The survey data was then exported from Qualtrics in CSV format. Forty-nine survey responses were then recorded in an Excel Spreadsheet, as Excel is a readily accessible file format for most users. The file size is 40 KB of data. No information about the respondents' names were inc ...
  • Reimagining Transportation as a Social Service to Build Resilience and Support Community Power
    Reimagining Transportation as a Social Service to Build Resilience and Support Community Power
    Pearce, Jeannine Marie ;
    Borowski, Elisa
    2025-10-01 | PDF
    This study develops guidance for public transit agencies in Los Angeles, California to better prepare for hazards and address challenges, including climate and safety concerns. Using a community-based participatory research methodology in partnership with the local non-profit organization Climate Resolve, we conducted three listening sessions with ...
  • NonCantilever Fatigue RemainingLife Simulation Software Using Probabilistic Wind Model for All Counties in Kansas
    Non-Cantilever Fatigue Remaining-Life Simulation Software Using Probabilistic Wind Model for All Counties in Kansas
    Al Shboul, Khalid W ;
    Rasheed, Hayder A.
    2025-10-01 | PDF
    This study presents a comprehensive tool to accurately predict the remaining fatigue life of full-span overhead highway sign support structures subjected to a long and sustained wind fluctuation. Synthetic wind time-histories were developed by superimposing cosine waves over frequencies of 3–300 Hz and randomly generated phase angles. The Kaimal sp ...
  • Evaluating the Potential Use of Traffic Speed Deflection DeviceBased Pavement Structural Data for Asphalt Pavements in VDOTs Pavement Management Processes
    Evaluating the Potential Use of Traffic Speed Deflection Device-Based Pavement Structural Data for Asphalt Pavements in VDOT’s Pavement Management Processes
    Katicha, Samer W. ;
    Flintsch, Gerardo W.
    2025-10-01 | PDF
    This report describes the evaluation of a proposed approach to incorporate structural condition information obtained from a traffic speed deflection device into the Virginia Department of Transportation (VDOT) pavement management system’s pavement treatment selection process for asphalt pavement sections, which are denoted within the VDOT pavement ...
  • Mitigating Concentrated Sheet Flow of Water at Ends of Superelevated Curves
    Mitigating Concentrated Sheet Flow of Water at Ends of Superelevated Curves
    Alani, Adam ;
    Roundy, Joshua
    2025-10-01 | PDF
    Superelevated highway transitions experience an area of zero-cross slope as one side of the roadway transitions from a normal crown cross slope to superelevation. These areas of minimal transverse cross slope combined with minimal longitudinal grade can cause an increase in water accumulation on highways, which can increase the likelihood for hydro ...
  • Evaluation of Structural Fillers for Steel Grouting in Steel Bridge Preventive Maintenance and Repairs
    Evaluation of Structural Fillers for “Steel Grouting” in Steel Bridge Preventive Maintenance and Repairs
    Provines, Jason T. ;
    Starr, Joshua
    2025-10-01 | PDF
    In some instances, steel bridges can contain gaps between steel plates in bolted connections or between steel and concrete surfaces. In new bridges, these gaps may result from fabrication or assembly errors. In existing structures, the gaps often arise because of corrosion-related section loss. These gaps can also cause durability concerns because ...
  • Update on Evaluating the Magnitude and Time Rate of Consolidation Settlement of Embankments and Other Piezocone Penetration Tests PCPT Project Capsule
    Update on Evaluating the Magnitude and Time Rate of Consolidation Settlement of Embankments and Other Piezocone Penetration Tests (PCPT) [Project Capsule]
    Abu-Farsakh, Murad Y.
    2025-10-01 | PDF
    The construction of embankments and other infrastructure elements over saturated, compressible, cohesive soft soils in Louisiana presents significant geotechnical design challenges due to anticipated large magnitudes of consolidation settlement and slow rates of consolidation. Inaccurate estimation of these deformations can lead to significant diff ...
  • NonCantilever Fatigue RemainingLife Simulation Software Using Probabilistic Wind Model for All Counties in Kansas Technical Summary
    Non-Cantilever Fatigue Remaining-Life Simulation Software Using Probabilistic Wind Model for All Counties in Kansas [Technical Summary]
    Al Shboul, Khalid W ;
    Rasheed, Hayder A.
    2025-10-01 | PDF
    This study used finite element shape functions to conduct spatial interpolation of wind-speed records for all Kansas counties (Al Shboul et al., 2023). This method considered spatial correlations among boundary sites. Artificial wind-time histories were constructed for each day for the entire 45-year study period, and the number of cycles developed ...
  • Interstate 64 Pavement Recycling Instrumentation and Monitoring
    Interstate 64 Pavement Recycling Instrumentation and Monitoring
    Ruiz, Carolina Benavides ;
    Flintsch, Gerardo W.
    2025-10-01 | PDF
    During the past two decades, the implementation of pavement recycling techniques, such as cold central plant recycling and full-depth reclamation, for pavement rehabilitation and construction in the United States has been driven by positive performance and the opportunity for significant cost and environmental savings. However, these recycling tech ...
  • NondestructiveNoncontact Inspection Protocols and Technologies for Aging Mechanically Stabilized Earth and Modular Block Retaining Walls Volume I
    Nondestructive/Noncontact Inspection Protocols and Technologies for Aging Mechanically Stabilized Earth and Modular Block Retaining Walls, Volume I
    Maghiar, Marcel ;
    Maldonado, Gustavo O.
    2025-10-01 | PDF
    This volume is the first in a series. The other volume in the series is FHWA-GA-25-2217 Volume II. As Mechanically Stabilized Earth and Modular Block retaining walls age within Georgia's highway infrastructure, their stability and safety are critical concerns. Currently, unlike bridges, these retaining walls lack standardized inspection protocols, ...
  • Digital Delivery Roadmap for Implementing Building Information Model BIM for Infrastructure at GDOT
    Digital Delivery: Roadmap for Implementing Building Information Model (BIM) for Infrastructure at GDOT
    Ashuri, Baabak ;
    Lee, SeungYeon
    2025-10-01 | PDF
    As transportation agencies transition toward more data-driven and collaborative project delivery, the Georgia Department of Transportation (GDOT) has initiated a strategic effort to define and implement digital delivery. This research develops a comprehensive roadmap for GDOT based on an integrated methodology that combines internal interviews, a s ...
  • Scaling Matching and Variability Effects of Ground Motion Selection in Performance Uncertainty
    Scaling, Matching, and Variability: Effects of Ground Motion Selection in Performance Uncertainty
    Yang, Ya-Heng ;
    Becker, Tracy C.
    2025-10-01 | PDF
    The selection of ground motions for time series analysis of structures remains a topic of considerable debate. While both time domain method and spectral matching are permitted by the Caltrans Seismic Design Criteria (SDC), the implications of the choice are not fully understood. To explore and compare how these different modification methodologies ...
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