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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 41 - 60 of 35412 results
  • 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, ...
  • 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, ...
  • 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 ...
  • Field and Lab Evaluation of Compacted Concrete Pavement Mixtures
    Field and Lab Evaluation of Compacted Concrete Pavement Mixtures
    Roesler, Jeffery ;
    Ouellet, Jordan
    2025-10-01 | PDF
    This research evaluated compacted concrete pavement (CCP) constructed on a local road in Jerseyville, Illinois, and developed a future CCP mix based on a recently proposed roller-compacted concrete (RCC) mix design process using a gyratory compactor. The Jerseyville evaluation provided valuable insights into the batching, hauling, paving, compactin ...
  • 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 ...
  • 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 ...
  • Seat Belt Use in 2024 Overall Results Traffic Safety Facts Research Note
    Seat Belt Use in 2024 – Overall Results [Traffic Safety Facts - Research Note]
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2025-10-01 | PDF
    This Research Note briefly summarizes seat belt use in 2024. The national estimate of seat belt use by adult front-seat passengers of passenger vehicles in 2024 was 91.2 percent, nearly the same as the 91.9 percent observed in 2023. The seat belt use rate estimate represents the percentage of occupants who are belted during an average daylight mome ...
  • Bringing Montanas History into the Future Modernizing MDTs Interpretive Marker System
    Bringing Montana’s History into the Future: Modernizing MDT’s Interpretive Marker System
    Villwock-Witte, Natalie ;
    Clouser, Karalyn
    2025-10-01 | PDF
    The Montana Department of Transportation currently administers 295 interpretive markers along the state’s primary and secondary roads and in rest areas along interstates. Historically, travelers could stop to read the interpretive markers. Then, printable guidebooks were created, with some agencies still using these today. With contemporary technol ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Evaluation of Combining Heat Induction and Laser Ablation for the Removal of Potentially Hazardous Bridge Coatings
    Evaluation of Combining Heat Induction and Laser Ablation for the Removal of Potentially Hazardous Bridge Coatings
    Sharp, Stephen R ;
    Provines, Jason T.
    2025-09-01 | PDF
    This project aimed to evaluate whether combining induction coating removal (ICR) and laser ablation coating removal (LACR) could be combined to remove hazardous bridge coatings at practical rates. This study included evaluations of the coating removal rates, surface cleanliness, surface profile, steel substrate mechanical properties, recoating adhe ...
  • 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 ...
  • Automating Variable Speed Limits Using Weather Traffic and Friction Data
    Automating Variable Speed Limits Using Weather, Traffic and Friction Data
    Petzke, Bill ;
    Wang, Hao
    2025-09-01 | PDF
    Variable speed limits (VSL) are useful in promoting highway safety. According to the Federal Highway Administration (FHWA), “the use of VSLs during inclement weather or other less than ideal conditions can improve safety by decreasing the risks associated with traveling at speeds that are higher than appropriate for the conditions.” The project’s r ...
  • 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 ...
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