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rosaP Repository & Open Science Access Portal

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 321 - 340 of 36368 results
  • Assessment of UltraHigh Toughness Steel for Highway Bridges
    Assessment of Ultra-High Toughness Steel for Highway Bridges
    Collins, William ;
    Artmont, Frank A.
    2025-09-01 | PDF
    The objective of this study was to investigate the effectiveness of using ultra-high toughness (UHT) steel in bridges to improve the structural reliability for the fracture limit state. The work included literature review, identification of candidate UHT steels, initial material characterization of all candidate steels, in-depth material characteri ...
  • Urban Growth Congestion and Equity Leveraging MultiMobility and Active Infrastructure Investments for Livable Cities A Dissertation
    Urban Growth, Congestion, and Equity: Leveraging Multi-Mobility and Active Infrastructure Investments for Livable Cities: A Dissertation
    Raymer, Meredith
    ORCID ICON IMG
    2025-09-01 | PDF
    Cities are dynamics centers of modern life, continually evolving through both growth and decline. While agglomeration and associated amenities are benefits of growing global urbanization, congestion and the resulting pollution, delays, and inequity are common negative externalities of increasing urbanization. This study evaluates growth and congest ...
  • Development of a Simplified Methodology to Assess the Internal Redundancy of BoltedBuiltUp Tied Arch Members
    Development of a Simplified Methodology to Assess the Internal Redundancy of Bolted-Built-Up Tied Arch Members
    Farooq, Shah Zaib ;
    Korkmaz, Cem
    2025-09-01 | PDF
    Tied arch bridges represent a vital component of the nation's infrastructure, valued for their structural efficiency and aesthetic qualities. These bridges rely on arch ribs to transfer vertical loads into horizontal thrusts, which are counteracted by the tie beams (TBs) acting in axial tension. In addition to this axial tension, TBs are also subje ...
  • LongTerm Corrosion Monitoring in Mechanically Stabilized Earth MSE Walls Summary
    Long-Term Corrosion Monitoring in Mechanically Stabilized Earth (MSE) Walls [Summary]
    Kulesza, Stacey ;
    Parsons, Robert
    2025-09-01 | PDF
    Mechanically stabilized earth (MSE) walls often contain galvanized steel reinforcement. Because galvanized steel eventually corrodes, however, the corrosion process must be closely monitored to accurately determine where structures are in their life cycle and to improve specifications to lengthen the lifespan of future MSE walls. This report is a c ...
  • Effective Coordination with Towing Companies for Incident Response and Clearance Tech Brief
    Effective Coordination with Towing Companies for Incident Response and Clearance [Tech Brief]
    Brown, Henry ;
    Sun, Carlos
    2025-09-01 | PDF
    Tow truck operators are exposed to traffic when responding to incidents. Stalled vehicles on the highway can hinder safety and operations on the highway and can create a risk of secondary incidents. Fast and effective removal of stalled vehicles on the highway can improve traffic operations and safety for tow truck operators and all users of the tr ...
  • Traffic DisruptionFree Bridge Inspection Initiative with Robotic Systems Research Summary
    Traffic Disruption-Free Bridge Inspection Initiative with Robotic Systems [Research Summary]
    Chen, Genda ;
    Harper, Jennifer
    2025-09-01 | PDF
    The research team evaluated 59 bridges in diverse types, age groups, and geographical locations. Best practices of the technologies were developed and summarized in inspection protocols and guidelines using commercial drones, structural crawlers, and hybrid uncrewed vehicles. Bridge inspection protocols and guidelines are presented in three parts: ...
  • Effects of Trucking Regulatory Relaxations on Freight Safety in Oregon
    Effects of Trucking Regulatory Relaxations on Freight Safety in Oregon
    Anderson, Jason C. ;
    McKenzie, William
    2025-09-01 | PDF
    This study explores the effects of pandemic-related trucking relaxations on freight safety in Oregon. A historical review of trucking relaxations before and during the pandemic is conducted and compared. Using traffic volume levels and key pandemic dates, three time periods were chosen for analysis: (1) pre-pandemic, (2) a low VMT pandemic period w ...
  • EndtoEnd Learning Framework for Transportation Network Equilibrium Modeling
    End-to-End Learning Framework for Transportation Network Equilibrium Modeling
    Liu, Zhichen ;
    Yin, Yafeng
    2025-09-01 | PDF
    This project introduces an end-to-end framework for constructing integrated traffic network equilibrium models, which can serve as lightweight travel demand models, directly from multi-day aggregate traffic state observations. Unknown components on both the supply and demand sides are parameterized with computational graphs and embedded in a variat ...
  • Evaluating Road Designs That Use Lower Quality Aggregate Research Summary
    Evaluating Road Designs That Use Lower Quality Aggregate [Research Summary]
    Tutumluer, Erol ;
    Velasquez, Raul
    2025-09-01 | PDF
    Aggregate materials used in the base and subbase layers of pavements provide structural support and drainability to Minnesota roads. But the supply of locally available high-quality aggregate material is becoming increasingly scarce. This project explored sustainable and cost-effective solutions for constructing durable flexible pavement roads with ...
  • Evaluation of Unbonded Jointed Concrete Overlays
    Evaluation of Unbonded Jointed Concrete Overlays
    Pérez, Jesús Castro ;
    Bhardwaj, Richa
    2025-09-01 | PDF
    Concrete overlays for existing concrete and asphalt roads have been shown to be a viable rehabilitation or replacement option. This research project evaluated three unbonded concrete overlay (UBOL) projects in Illinois with high, medium, and very low truck volumes. The project’s goal was to assess each overlay’s performance including the influence ...
  • Beyond the Conventional Exploring Pedestrian Safety on Interstates with Bayesian and Machine Learning Models
    Beyond the Conventional: Exploring Pedestrian Safety on Interstates with Bayesian and Machine Learning Models
    Usman, Sheikh M. ;
    Khattak, Asad J.
    2025-09-01 | PDF
    Despite being prohibited from walking on freeways per federal laws, 14% to 17% of all pedestrian crashes in the United States happen on the interstates. Examining these crashes within the context of the safe systems approach is essential, with an emphasis on mitigating safety risks for all road users. This study investigates the correlates of pedes ...
  • Towards a Centralized BIM Transportation Library
    Towards a Centralized BIM Transportation Library
    Costin, Aaron ;
    Ketterl, Mona
    2025-09-01 | PDF
    This report provides a comprehensive assessment and availability of the technical resources required in the development of a Central Building Information Modeling (BIM) Transportation Library (CBTL), outlining its foundational requirements based on past research, related projects, and stakeholder engagement. The CBTL is envisioned as a nationally a ...
  • Proceedings of the 33rd United States Japan Bridge Engineering Workshop
    Proceedings of the 33rd United States - Japan Bridge Engineering Workshop
    Yang, David Y.
    ORCID ICON IMG
    2025-09-01 | PDF
    This report summarizes the 33rd United States–Japan Bridge Engineering Workshop, an event that convenes bridge engineers from both countries. The workshop serves as a platform to exchange innovative ideas and technologies, as well as to share crucial knowledge and lessons learned, all with the aim of advancing bridge engineering. The 33rd workshop ...
  • Effects of Extreme Climate Shifts to Pavement Infrastructure in Tennessee
    Effects of Extreme Climate Shifts to Pavement Infrastructure in Tennessee
    Onyango, Mbakisya ;
    Fomunung, Ignatius
    2025-09-01 | PDF
    Resilient pavement infrastructure is a dream of every transportation agency. Many factors affect the health of pavement infrastructure to include extreme climate shifts. This study evaluated the effects of climate shifts to pavement infrastructure in Tennessee. The study used AASHTOWare PMED software to predict distresses on selected pavement secti ...
  • Field Study to Determine Salt Usage Efficiency and Transport to the Surrounding Environment on Two Pavement Types
    Field Study to Determine Salt Usage Efficiency and Transport to the Surrounding Environment on Two Pavement Types
    Mogawer, Walaa S. ;
    Austerman, Alexander J.
    2025-09-01 | PDF
    The purpose of this study was to collect and analyze field data to determine whether winter salt applications on Open Graded Friction Course (OGFC) and Dense Graded (DG) pavement types are appropriate, deficient, or excessive. The study aimed to provide the Massachusetts Department of Transportation (MassDOT) with evidence-based guidance for optimi ...
  • Whos to Blame for EScooter Collisions An Analysis of the Language Used in EScooter Collision Reporting
    Who’s to Blame for E-Scooter Collisions?: An Analysis of the Language Used in E-Scooter Collision Reporting
    Johnson, Milena
    ORCID ICON IMG
    2025-08-31 | PDF
    The growing popularity of electric scooters (e-scooters) in urban environments has led to increased media coverage on their perceived danger both to the rider and to other users of the roadway. Media surrounding traffic collisions has long been criticized by safety researchers and activists for implicitly assigning blame to more vulnerable road use ...
  • Select High Risk Pedestrian Midblock Crossings and Perform Safety Evaluations for Developing Pedestrian Crossings Project Summary
    Select High Risk Pedestrian Midblock Crossings and Perform Safety Evaluations for Developing Pedestrian Crossings [Project Summary]
    Sharif, Hatim O. ;
    Dessouky, Samer
    2025-08-31 | PDF
    The researchers conducted a comprehensive literature review to evaluate the current state of practice surrounding crash rates and severity at midblock crossings. They examined technical reports and publications from transportation agencies, FHWA, NCHRP, and peer-reviewed journals. Findings were synthesized into a detailed summary of risk factors, p ...
  • Develop Guidance for Sustainable Traffic Signal Operation Strategies to Support All Intersection Users Project Summary Report
    Develop Guidance for Sustainable Traffic Signal Operation Strategies to Support All Intersection Users [Project Summary Report]
    Machemehl, Randy ;
    Reynolds, Isabelle
    2025-08-31 | PDF
    The research team conducted a thorough review of the state of the art and state of the practice of complete street pedestrian and bicycle safety countermeasures. They developed a thorough review of techniques used to compute crash modification factors for safety countermeasures, including signal operations strategies. They produced a discussion of ...
  • Develop an Interactive Unit Price Estimation and Visualization Tool Project Summary Report
    Develop an Interactive Unit Price Estimation and Visualization Tool [Project Summary Report]
    Shahandashti, Mohsen ;
    Yasar, Mahmut
    2025-08-31 | PDF
    The primary objectives of this research project were to (1) conduct an overview analysis of factors affecting unit prices, (2) identify factors affecting unit prices in Texas, (3) create a unit price estimation database, (4) create a spatio-temporal unit price estimation model considering the factors affecting unit prices, (5) develop a GIS-based v ...
  • Connecting the First and Last Mile A Systematic Review of Student Use of EScooters for FirstLastMile Connections to Public Transit
    Connecting the First and Last Mile: A Systematic Review of Student Use of E-Scooters for First/Last-Mile Connections to Public Transit
    Wilcox, Micah
    ORCID ICON IMG
    2025-08-31 | PDF
    Students on university campuses have several available options for travel, including cars, buses, and micromobility, the latter of which encompasses bicycles and more recently, shared e-scooters (e-scooters). E-scooters are lightweight, electric vehicles which can be rented or purchased easily. They offer an ideal option to close the first/last-mil ...
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