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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 841 - 860 of 36841 results
  • Coarse Aggregate Deterioration in Granular Surfaces and Shoulders
    Coarse Aggregate Deterioration in Granular Surfaces and Shoulders
    Lamba, Kanika H ;
    Ashlock, Jeramy C.
    2025-04-01 | PDF
    The goal of this project was to characterize the relative performance and changes in microstructural and engineering properties for various types of coarse aggregates subjected to weathering as well as real and simulated traffic loads typical of granular surfaces and shoulders of Iowa roads. Through an extensive program of geotechnical laboratory t ...
  • Evaluation of BMD Surface Mixtures with Conventional and High RAP Contents Under LaboratoryScale and FullScale Accelerated Testing
    Evaluation of BMD Surface Mixtures with Conventional and High RAP Contents Under Laboratory-Scale and Full-Scale Accelerated Testing
    Habbouche, Jhony ;
    Tong, Bilin
    2025-04-01 | PDF
    Balanced Mix Design (BMD) is an asphalt mixture design method that replaces some aspects of traditional volumetric design with performance testing for the most common distresses, such as rutting and cracking. This approach provides an opportunity to properly design and produce engineered asphalt mixtures, including those with higher reclaimed aspha ...
  • Performance Acceptance and Performance Monitoring of Pavement Using Falling Weight Deflectometer FWD and International Roughness Index IRI
    Performance Acceptance and Performance Monitoring of Pavement Using Falling Weight Deflectometer (FWD) and International Roughness Index (IRI)
    Khajehvand, Maya ;
    Mamun, Abdulah Al
    2025-04-01 | PDF
    The Indiana Department of Transportation (INDOT) utilizes the International Roughness Index (IRI) and Falling Weight Deflectometer (FWD) data to prioritize pavement maintenance across interstates, state roads, and U.S. highways. While IRI measures ride quality and FWD assesses structural integrity, their threshold values vary by road type, reflecti ...
  • Develop a Tool for Sight Distance Analysis Using GIS and LiDAR Data
    Develop a Tool for Sight Distance Analysis Using GIS and LiDAR Data
    Zhou, Huaguo ;
    Yang, Fangjian
    2025-04-01 | PDF
    Intersection Sight Distance (ISD) plays a critical role in ensuring roadway safety, particularly at unsignalized intersections where the lack of adequate visibility can result in severe accidents. Traditional ISD assessment methods often rely on manual measurements, which can be time-consuming, costly, and prone to inaccuracies. This study aims to ...
  • Laboratory Investigation of Concretes for PartialDepth Link Slabs
    Laboratory Investigation of Concretes for Partial-Depth Link Slabs
    Sharifi, Mary ;
    Ozyildirim, Celik
    2025-04-01 | PDF
    Bridge deck joints frequently leak, leading to the infiltration of harmful chlorides and other solutions that accelerate the deterioration of beam ends, bearings, and substructures. To mitigate this costly maintenance issue and extend the service life of conventional bridges, the Virginia Department of Transportation has been using full-depth link ...
  • Safety Performance of Pavement Marking Retroreflectivity in Alabama
    Safety Performance of Pavement Marking Retroreflectivity in Alabama
    Zhou, Huaguo ;
    Hossain, Md Mahmud
    2025-04-01 | PDF
    The evaluation of pavement marking materials primarily relies on their retroreflectivity (RL) — a measure of how effectively they reflect vehicle headlights back toward the driver. State DOTs typically contract private firms to measure RL, often without accurate records of when markings were installed or restriped. Additionally, establishing the st ...
  • Impact of Start Time on Students Walking and Biking to School Research Summary
    Impact of Start Time on Students Walking and Biking to School [Research Summary]
    Levin, Michael W.
    2025-04-01 | PDF
    Some school districts schedule elementary schools with early start times for various reasons. Such start times sometimes necessitate travel before sunrise during winter months. Intuitively, this could potentially conflict with a desire for increased use of active transportation, e.g. from the Safe Routes to School program, to reduce motor vehicle t ...
  • Evaluating Roadway Trash and Migration to Receiving Water Task Order 2
    Evaluating Roadway Trash and Migration to Receiving Water - Task Order #2
    CDM Smith
    2025-04-01 | PDF
    The overall goal of this study was to obtain information on trash generation and discharge from Significant Trash Generating Areas (STGAs) to determine the effectiveness of selected controls and demonstrate full trash capture efficiency. The study monitored eight STGAs with on-land visual trash assessments for general trash accumulation. In additio ...
  • I24 Smart Corridor V2X Roadmap
    I-24 Smart Corridor V2X Roadmap
    Hill, Terrance ;
    Smith, Matthew
    2025-04-01 | PDF
    The I-24 SMART Corridor takes a comprehensive approach to improving the safety and travel time reliability along the corridor utilizing existing infrastructure and emerging technology. Vehicle-to-Everything (V2X) technologies are a key initiative of Tennessee Department of Transportation (TDOT) by aligning with several strategic goals of TDOT inclu ...
  • 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 ...
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