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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 621 - 640 of 36368 results
  • Synthesis of Feasibility Analysis of UltraHigh Performance Concrete for Prestressed Concrete Bridge Application
    Synthesis of Feasibility Analysis of Ultra-High Performance Concrete for Prestressed Concrete Bridge Application
    Wan, Zhe ;
    Newtson, Craig M.
    2025-04-01 | PDF
    UHPC is an advanced construction material characterized by exceptional compressive strength, enhanced tensile properties, and superior durability. Where prestressed concrete girders are used in New Mexico’s bridge infrastructure, integrating UHPC offers a cost-effective and sustainable solution to enhance structural strength, longevity, and resilie ...
  • The Effects of the COVID19 Pandemic on Transit in the San Francisco Bay Area
    The Effects of the COVID-19 Pandemic on Transit in the San Francisco Bay Area
    Lee, Richard W. ;
    Reinke, David B.
    2025-04-01 | PDF
    This report presents the findings from our study for the California State Assembly Transportation Committee on the effects of the COVID-19 pandemic on Bay Area Transit. The study consisted of a review of the literature on the effects of the pandemic on transit in the US, a detailed look at changes in ridership and economics for Bay Area transit age ...
  • Assessment of Paved Road Dust Emissions Road Dust Modeling
    Assessment of Paved Road Dust Emissions (Road Dust) Modeling
    Hopkins, Francesca M ;
    Bahreini, Roya
    2025-04-01 | PDF
    Under this project a novel road dust collection system has been designed that utilizes a modified van with a vacuum collection system that samples road dust on freeways. The project has also developed a new mechanistic model for particulate matter (PM) emission estimates as an alternative approach to the EPA's AP-42 model. The test for the road dus ...
  • Establishing PostConstruction Roadside Vegetation Growth Research Summary
    Establishing Post-Construction Roadside Vegetation Growth [Research Summary]
    Cetin, Bora
    ORCID ICON IMG
    2025-04-01 | PDF
    Post-construction roadside soils often suffer from compaction, low fertility, and poor structure, challenging vegetation establishment and stormwater management. This study evaluates the effectiveness of organic amendments (OAs) and proprietary amendments as alternatives to traditional methods. The study involves greenhouse experiments (pot and mes ...
  • Investigation and Assessment of Effective Patching Materials for Concrete Bridge Decks
    Investigation and Assessment of Effective Patching Materials for Concrete Bridge Decks
    Rangaraju, Prasad
    2025-04-01 | PDF
    Periodic maintenance of bridge decks through patching repairs is an essential strategy to maintain an effective transportation network. However, poor performance of patched sections needs to be studied to develop appropriate material selection methodology and proper construction practices to achieve durable repairs. The principal objective of this ...
  • Asset Characterization Using Automated Methods
    Asset Characterization Using Automated Methods
    Kim, Sungyop ;
    Baker, Donald
    2025-04-01 | PDF
    Increasing and intensifying flood events pose serious challenges to highway agencies in maintaining water crossing assets and assessing potential flood hazards. This project aimed to develop an automated flood risk assessment program for small water crossing assets, focusing on culverts with less than a 20-foot span not listed in the 2023 National ...
  • Implementation of OMSBased Scour Prediction and RealTime Monitoring of Scour Processes for Alabama Bridges
    Implementation of OMS-Based Scour Prediction and Real-Time Monitoring of Scour Processes for Alabama Bridges
    Vasconcelos, Jose G. ;
    Anderson, J. Brian
    2025-04-01 | PDF
    This research compares the current methods used by ALDOT in developing bridge pier scour calculations, based on FHWA HEC-18, with alternative methods using the Observational Method for Scour and propose methods for pier scour real time monitoring. The work performed entailed the development of pier scour depth estimates in four Alabama bridges usin ...
  • Influence of Internal Curing on Concretes Permeability in Simulated Field Conditions Summary
    Influence of Internal Curing on Concrete’s Permeability in Simulated Field Conditions [Summary]
    Liu, Zhen
    2025-04-01 | PDF
    The curing conditions stated in the AASHTO T358 standard require that concrete specimens remain fully saturated at all times in a moist room or cabinet prior to testing. These curing conditions obscure the true impact of internal curing. In order to assess the benefits of internal curing under more realistic condition, this study compared internall ...
  • 2024 Revisions To 2 CFR 200
    2024 Revisions To 2 CFR 200
    White, Enid
    2025-04-01 | PDF
    The 2024 revision to 2 CFR 200 updated clauses and renamed the document as the OMB Guidance for Federal Assistance. [Effective 10-1-2024] The revisions also include changes to 2 CFR 1, 25, 170, 175, 180, 182, and 183.
  • Fuel Cell System Development for Heavy Duty Vehicles Brief
    Fuel Cell System Development for Heavy Duty Vehicles [Brief]
    Yang, Yu ;
    Yeh, Hen-Geul
    2025-04-01 | PDF
    As California advances its ambitious goals for transportation electrification to combat climate change, hydrogen-powered fuel cells are emerging as a viable solution for overcoming the challenges of heavy-duty vehicles, offering an efficient alternative to lithium-ion batteries because they produce minimal chemical, thermal, and carbon emissions. O ...
  • Assessment of Laboratory Friction Testing Equipment and Validation of Pavement Friction Characteristics with Field and Accelerated Friction Testing Summary
    Assessment of Laboratory Friction Testing Equipment and Validation of Pavement Friction Characteristics with Field and Accelerated Friction Testing [Summary]
    Wu, Zhong ;
    Zhang, Zhongjie “Doc”
    2025-04-01 | PDF
    This report reviews the research and advancements in using the Three-Wheel Polishing Device (TWPD) for aggregate polishing and the Dynamic Friction Tester (DFT) to measure the polishing resistance of coarse aggregates in asphalt wearing course mixes. The Louisiana Department of Transportation and Development (DOTD) currently employs the British Pol ...
  • Assessment of Laboratory Friction Testing Equipment and Validation of Pavement Friction Characteristics with Field and Accelerated Friction Testing
    Assessment of Laboratory Friction Testing Equipment and Validation of Pavement Friction Characteristics with Field and Accelerated Friction Testing
    Wu, Zhong ;
    Hungria, Ricardo
    2025-04-01 | PDF
    This report reviews the research and advancements in using the Three-Wheel Polishing Device (TWPD) for aggregate polishing and the Dynamic Friction Tester (DFT) to measure the polishing resistance of coarse aggregates in asphalt wearing course mixes. The Louisiana Department of Transportation and Development (DOTD) currently employs the British Pol ...
  • Experimental and Analytical Evaluation of Residual Capacity of CorrosionDamaged Prestressed Concrete Bridge Girders
    Experimental and Analytical Evaluation of Residual Capacity of Corrosion-Damaged Prestressed Concrete Bridge Girders
    Alfailakawi, Ali ;
    Roberts-Wollmann, C L
    2025-04-01 | PDF
    The durability of infrastructure components, such as prestressed concrete bridge beams, can be significantly affected by long-term deterioration associated with corrosion. Corrosion is a major concern for bridges in Virginia, due to the frequent use of deicing salts during the winter, as well as the number of structures in marine environments. The ...
  • Summary Report for Pooled Fund Program TPF 5343
    Summary Report for Pooled Fund Program TPF 5(343)
    Sheikh, Nauman M. ;
    Bligh, Roger P.
    2025-04-01 | PDF
    Established in 2016, the Roadside Safety Pooled Fund Program TPF 5(343) facilitated collaborative research among State Departments of Transportation (DOTs) to address challenges related to roadside safety features. The program prioritized research to support State DOTs in the implementation of the American Association of State Highway and Transport ...
  • Evaluation of Electronic Enforcement of Motor Carrier Compliance and Safety
    Evaluation of Electronic Enforcement of Motor Carrier Compliance and Safety
    Hernandez, Salvador ;
    Anderson, Jason C.
    2025-04-01 | PDF
    This study evaluates the implementation of electronic enforcement. A review of electronic enforcement technology was conducted, and best practices of electronic enforcement were documented. Using inspection and violation data, a statewide and site-specific analysis were conducted to determine violations that occurred most often. Upon identification ...
  • Safe System Research and Implementation Final Report
    Safe System Research and Implementation: Final Report
    Banerjee, Ipsita ;
    Luo, Qianhua
    2025-03-31 | PDF
    Fatal and serious injury (FSI) crashes in California have increased by 51.9% in the past decade. To curb this growth, Director’s Policy 36 was issued for Caltrans to adopt the Safe System Approach, an approach that has proven to reduce FSI crashes by large margins in countries and cities that have adopted it. Following this, two Safe System-aligned ...
  • Orange Contrasted Temporary Pavement Delineation in Construction Zones
    Orange Contrasted Temporary Pavement Delineation in Construction Zones
    Linke, Barbara ;
    White, Wilderich A.
    2025-03-31 | PDF
    The California Department of Transportation (Caltrans) needs to maintain safety on its roads, including during construction in work zones. Orange temporary striping promises to increase driver awareness of construction work zones. This project collected and analyzed quantitative and subjective data about driver behavior and traffic incidents over t ...
  • Battery Technologies for Current and Future HeavyDuty and Transit Electric Vehicles
    Battery Technologies for Current and Future Heavy-Duty and Transit Electric Vehicles
    Burke, Andrew F. ;
    Zhao, Jingyuan
    2025-03-14 | PDF
    This report examines the electrification of buses, vocational trucks, and construction machinery, as well as the impact of advancements in battery technology on this transition. The electrification of these vehicles and machinery, alongside rapid progress in battery development, is accelerating. This study provides a comprehensive review of current ...
  • Chemical Incident Reports Events Reported to the CSB Under the Accidental Release Reporting Rule Volume 2
    Chemical Incident Reports: Events Reported to the CSB Under the Accidental Release Reporting Rule [Volume 2]
    U.S. Chemical Safety and Hazard Investigation Board
    2025-03-12 | PDF
    Volume 2 covers 25 serious chemical incidents in 14 states: Arkansas, Alabama, California, Colorado, Connecticut, Illinois, Louisiana, Mississippi, Nebraska, Nevada, New Mexico, Ohio, Oklahoma and Texas. These serious incidents resulted in 7 fatalities, 23 serious injuries, and approximately $1 billion in property damage. The reports give the publi ...
  • Project Summary Automated Truck Mounted Attenuator ATMA
    Project Summary: Automated Truck Mounted Attenuator (ATMA)
    Minnesota. Department of Transportation
    2025-03-11 | PDF
    Connected and automated vehicle (CAV) technology has the potential to significantly increase work zone safety. Each day, MnDOT maintenance employees and contractors are at risk of being involved in crashes when performing road work. To mitigate this risk, MnDOT uses truck mounted attenuators – or crash cushions – to help protect roadside workers).
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