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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 121 - 140 of 35811 results
  • 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 ...
  • Using Infrastructure to Boost Safety in a PNT World Balancing Reliability Overreliance Malfunction Risks and Cybersecurity to Improve Intersection Safety
    Using Infrastructure to Boost Safety in a PNT World: Balancing Reliability, Overreliance, Malfunction Risks, and Cybersecurity to Improve Intersection Safety
    Haddad, Angela J. ;
    Bhat, Chandra R.
    2025-09-30 | PDF
    Cooperative perception broadens the sensing range of an automated vehicle, especially in urban settings where other road users and infrastructure create occlusions. However, it raises safety concerns because received information can be incorrect due to faults or malicious attacks, which can lead to unsafe planning. We study object-level fusion stra ...
  • Slope Restoration on Urban Freeways
    Slope Restoration on Urban Freeways
    Cregg, Bert M.
    ORCID ICON IMG
    2025-09-30 | PDF
    Improving the diversity of roadside plantings can provide an array of benefits including improved aesthetics, improved driver safety, and increased biodiversity. However, establishing landscape plants along roadsides can often be difficult due to a variety of soil related and other environmental factors. In an earlier trial, researchers from Michig ...
  • 319 Detection and Monitoring of Material Aging and Structural Deterioration Using Electromagnetic and Mechanical Sensors with Virtual Reality and Machine Learning Modeling
    3.19 Detection and Monitoring of Material Aging and Structural Deterioration Using Electromagnetic and Mechanical Sensors with Virtual Reality and Machine Learning Modeling
    Yu, Tzuyang ;
    Wei, Jianqiang
    2025-09-30 | PDF
    The research problem we are trying to solve is the detection and monitoring of aging civil infrastructure components and systems in New England by using visual information and subsurface images in a virtual reality (VR) environment for data visualization and machine learning (ML) for data interpretation. The overall research objective is to study t ...
  • Capacity Prediction of Repaired and Unrepaired Bridge Beams with Deteriorated Ends
    Capacity Prediction of Repaired and Unrepaired Bridge Beams with Deteriorated Ends
    Attanayake, Upul ;
    Bhowmik, Sanjoy
    2025-09-30 | PDF
    The Michigan Department of Transportation (MDOT) identified significant deterioration at the ends of steel and prestressed concrete (PSC) beams, requiring systematic evaluation and improved decision-making protocols for Requests for Action (RFAs). This comprehensive study examined 431 steel beam ends and 267 PSC bridges to develop capacity-based as ...
  • Distributed Fiber Optic Sensing System for Bridge Monitoring
    Distributed Fiber Optic Sensing System for Bridge Monitoring
    Wang, Xingwei ;
    Yu, Tzuyang
    2025-09-30 | PDF
    The deterioration of infrastructure presents a major challenge for the economy of any country. Additionally, the risk factor of possible loss of life has made Structural Health Monitoring (SHM) an important approach to evaluate the status of any civil infrastructure. Among different methods, Fiber Optics Sensors have shown great potential to comple ...
  • Electromagnetic Detection and Identification of Concrete Cracking in Highway Bridges
    Electromagnetic Detection and Identification of Concrete Cracking in Highway Bridges
    Yu, Tzuyang
    2025-09-30 | PDF
    The primary focus of our research is to address the challenge of evaluating aging concrete bridges, both reinforced and prestressed, located in New England. We have developed a remote radar sensor capable of characterizing corroded reinforced concrete structures, as well as a predictive capability to generate artificial cracks and simulate radar im ...
  • Project Governance Best Practices for When State DOTs Deliver Transit Projects
    Project Governance & Best Practices for When State DOTs Deliver Transit Projects
    Nepstad, Jon ;
    Henneman, Jack
    2025-09-26 | PDF
    This research project explores the consequences of Utah H.B.322, passed by the Utah legislature in 2022. The research includes a synopsis of the bill that relates to delivery of fixed guideway projects. It includes national peer agency research to explore if there are similar mandated arrangements around the US. Last, the research conducted one-on- ...
  • Utilizing Connected Vehicle Data to Identify Impacts of Congestion on Adjacent Agencies
    Utilizing Connected Vehicle Data to Identify Impacts of Congestion on Adjacent Agencies
    Driscoll, Thomas M ;
    Sakhare, Rahul Suryakant
    2025-09-23 | PDF
    Most state agencies have good practices for monitoring congestion on roadways within their jurisdiction. Many urbanized areas span state boundaries, where incidents, work zones, and congestion often impact neighboring states or municipalities. States with urbanized borders that experience congestion often develop informal communication procedures a ...
  • Analyzing NPMRDS Using Advanced Machine Learning to Enhance Road Safety Public Health and System Performance
    Analyzing NPMRDS Using Advanced Machine Learning to Enhance Road Safety, Public Health and System Performance
    Faezipour, Miad ;
    Park, Sangho
    2025-09-12 | PDF
    This project aims to leverage NPMRDS data and machine learning techniques to analyze the relationships between speed variations, crash occurrences, weather conditions, and road geometry. The goal is to identify patterns that can measure the performance of road segments and inform targeted safety interventions and infrastructure improvements. The pr ...
  • 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 ...
  • RepairPreservation of Concrete Compression Members in Bridges Using UltraHighPerformance Concrete UHPC
    Repair/Preservation of Concrete Compression Members in Bridges Using Ultra-High-Performance Concrete (UHPC)
    Hedia, Mohammed ;
    Morcous, George
    2025-09-01 | PDF
    As of 2024, approximately 36% of bridges across the United States require repair or replacement, with 7% classified as structurally deficient. The estimated cost to address these deficiencies exceeds $260 billion. In recent years, Ultra-High-Performance Concrete (UHPC) has emerged as a repair material for infrastructure preservation, drawing increa ...
  • LongTerm Corrosion Monitoring in Mechanically Stabilized Earth MSE Walls
    Long-Term Corrosion Monitoring in Mechanically Stabilized Earth (MSE) Walls
    Kulesza, Stacey ;
    Parsons, Robert
    2025-09-01 | PDF
    This research is a continuation of K-TRAN: KSU-19-5. Mechanically stabilized earth (MSE) walls with metallic reinforcement are widely used as a cost-effective means of earth retention. Metallic reinforcement, which is susceptible to corrosion, is typically sized for a 75-year design life after allowing for a standard rate of corrosion. The Kansas D ...
  • Historical Streamflow Discharge Trends Considering Climate Change and Application
    Historical Streamflow Discharge Trends Considering Climate Change and Application
    Rossetti, Maria S.
    2025-09-01 | PDF
    Bridges and large culverts are designed using historical streamflow data. However, historical streamflow data are static and do not account for changes in precipitation, temperature, and watershed characteristics such as the percentage covered by impervious surface. This report details efforts to determine if streamflow peak discharges in Virginia ...
  • Use of Innovative Recycling Agents for Improving the Sustainability and Durability of Asphalt Pavement Summary
    Use of Innovative Recycling Agents for Improving the Sustainability and Durability of Asphalt Pavement [Summary]
    Mohammad, Louay N. ;
    Elnaml, Ibrahim
    2025-09-01 | PDF
    The use of reclaimed asphalt pavement (RAP) as a partial replacement for virgin aggregates and asphalt binders has received considerable attention in recent years due to its economic and environmental benefits. These benefits include a potential reduction in asphalt mixture cost and the promotion of sustainability. However, many state Departments o ...
  • Exploring the Impact of Driver Sex Driver Age Area Type and Lighting Conditions on RearEnd Collision Severity
    Exploring the Impact of Driver Sex, Driver Age, Area Type, and Lighting Conditions on Rear-End Collision Severity
    Naseralavi, Saber ;
    Soltanirad, Mohammad
    2025-09-01 | PDF
    This study investigates the factors influencing injury severity in rear-end collisions in California using data from the Highway Safety Information System (HSIS). A total of 569,386 rear-end crashes recorded between 2015 and 2017 are analyzed. The dataset is divided into 24 subgroups based on driver sex (male, female), driver age (under 25, 25–65, ...
  • Phase III Investigation and Guidelines for Best Practices of Thermal Control for Mass Concrete Construction Projects
    Phase III: Investigation and Guidelines for Best Practices of Thermal Control for Mass Concrete Construction Projects
    Cho, Yong Kwon ;
    Gentry, Russell
    2025-09-01 | PDF
    The objective of this research is to expand and validate decision-making tools and best practices for mass concrete thermal management, integrating emerging cementitious materials. Building on the foundations established in previous phases, this project evaluates an expanded range of concrete mix designs—including Type IL cement and reclaimed fly a ...
  • 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 ...
  • Development of a Geotechnical Asset Management System
    Development of a Geotechnical Asset Management System
    Parsons, Robert L. ;
    Kulesza, Stacey
    2025-09-01 | PDF
    Geotechnical asset management (GAM) systems are a critical element of Transportation Asset Management (TAM) plans. Geotechnical assets include walls, slopes, embankments, and subgrades within the right of way. Although the Kansas Department of Transportation (KDOT) has a TAM, it does not currently have a GAM. A fully developed GAM would allow retri ...
  • Development of a Geotechnical Asset Management System Summary
    Development of a Geotechnical Asset Management System [Summary]
    Parsons, Robert L. ;
    Kulesza, Stacey
    2025-09-01 | PDF
    Geotechnical asset management (GAM) systems are a critical element of Transportation Asset Management (TAM) plans. Geotechnical assets include walls, slopes, embankments, and subgrades within the right of way. Although the Kansas Department of Transportation (KDOT) has a TAM, it does not currently have a GAM. A fully developed GAM would allow retri ...
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