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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 501 - 520 of 36841 results
  • 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 ...
  • Mobile Electric Vehicle DCFC Infrastructure Deployment Opportunities
    Mobile Electric Vehicle DCFC Infrastructure Deployment Opportunities
    Motallebi, Farhang ;
    Sim, Evan
    2025-09-30 | PDF
    This research was conducted to identify and evaluate mobile and semi-permanent DC fast-charging (DCFC) solutions for the California Department of Transportation's (Caltrans) growing electric vehicle (EV) fleet. To address infrastructure gaps that delay charging station deployments and hinder fleet operations, a comprehensive evaluation framework wa ...
  • 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 ...
  • 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 ...
  • Demonstration of Zero Speed Inertial Profilers
    Demonstration of Zero Speed Inertial Profilers
    Harris, Dwayne ;
    Karamihas, Steven
    2025-09-10 | PDF
    The Indiana Department of Transportation (INDOT) currently uses inertial profilers for quality assurance and quality control (QA/QC) of newly constructed pavement. However, these profilers face limitations in urban environments characterized by low speeds and stop-and-go traffic. Specifically, their accelerometers struggle to accurately model vehic ...
  • 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 ...
  • 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 ...
  • Effect of Asphalt Binder Source on Asphalt Mixture Performance
    Effect of Asphalt Binder Source on Asphalt Mixture Performance
    Mogawer, Walaa S. ;
    Rowe, Geoffrey
    2025-09-01 | PDF
    This study aims to identify point and shape rheological parameters that can effectively differentiate between high and low-quality asphalt binders, particularly in their resistance to intermediate-temperature cracking, regardless of binder source or formulation changes. Point parameters assess binder hardness, while shape parameters describe the bi ...
  • Effective Coordination with Towing Companies for Incident Response and Clearance
    Effective Coordination with Towing Companies for Incident Response and Clearance
    Brown, Henry ;
    Sun, Carlos
    2025-09-01 | PDF
    Tow truck operators are directly exposed to traffic when responding to incidents. In addition, 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 a ...
  • Assessment and Repair of Prestressed Bridge Girders Subjected to OverHeight Truck Impacts
    Assessment and Repair of Prestressed Bridge Girders Subjected to Over-Height Truck Impacts
    AbdelMalek, Haitham ;
    Ashun, Francis
    2025-09-01 | PDF
    This research investigates the impact of over-height vehicle collisions on prestressed concrete bridge girders and explores effective repair strategies to restore their structural integrity. The study addresses a critical concern in bridge resilience, as vehicle impacts can cause varying degrees of damage and severe prestressing strands which compr ...
  • 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 ...
  • Research Summary Evaluating Taconite as a Lower Cost Friction Treatment Research Summary
    Research Summary: Evaluating Taconite as a Lower Cost Friction Treatment [Research Summary]
    Zanko, Lawrence M. ;
    Lund, Victor
    2025-09-01 | PDF
    Minnesota’s taconite (iron ore) mining industry can provide adequate or comparable skid resistance performance to calcined bauxite in high friction surface treatment (HFST)-type applications. Six pavement test sections approximately 1/10th of a mile (160 meters) in length were established at a low volume road location northwest of Duluth, Minnesota ...
  • 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 ...
  • Night Versus Day WorkBalancing Safety Operations and Constructability for ShortTerm Operations on TwoLane Roads
    Night Versus Day Work—Balancing Safety, Operations, and Constructability for Short-Term Operations on Two-Lane Roads
    Robartes, Erin M
    2025-09-01 | PDF
    Allowable work hours (AWH), also known as Allowable Closure Hours or Limitations on Operations, for a contract dictate which hours of the day construction and maintenance activities may occur and are known to affect operations, constructability, and safety. Individual districts set AWH for activities—including short-term maintenance, paving project ...
  • Sources and Substitutes for Fly Ash in Concrete
    Sources and Substitutes for Fly Ash in Concrete
    Mobasher, Barzin ;
    Neithalath, Narayanan
    2025-09-01 | PDF
    Fly ash, a by-product of coal combustion, improves the workability, mechanical properties, durability, and sustainability of concretes when added as a supplement. Dwindling supplies of fly ash led Arizona DOT (ADOT) to investigate the use of alternative cementitious materials (ACMs) in concrete mixture designs. This study drew from a review of lite ...
  • Effective Coordination with Towing Companies for Incident Response and Clearance Summary
    Effective Coordination with Towing Companies for Incident Response and Clearance [Summary]
    Brown, Henry ;
    Breeding, Scott
    2025-09-01 | PDF
    Tow truck operators are directly exposed to traffic when responding to incidents. Stalled vehicles can also hinder safety and operations on the highway and can create risk of secondary incidents. The objectives of this research study are to synthesize existing department of transportation (DOT) practices regarding coordination with towing companies ...
  • Balanced Mix Design Field Trial Projects in Alabama
    Balanced Mix Design Field Trial Projects in Alabama
    Sadeghi, Mohammad ;
    Hartzog, Zane
    2025-09-01 | PDF
    The Alabama Department of Transportation (ALDOT) is advancing Balanced Mix Design (BMD) to improve the durability, reliability, and cost-effectiveness of asphalt pavements. To support implementation, a field validation project was conducted on State Route 55 in Covington County, Alabama, using six asphalt mixtures designed to meet target thresholds ...
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