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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 301 - 320 of 35438 results
  • Job Access Agency Cost and VMT Impacts of Offering Microtransit Alongside Fixedroute Transit
    Job Access, Agency Cost, and VMT Impacts of Offering Microtransit Alongside Fixed-route Transit
    Hyland, Michael ;
    Pike, Susan
    2025-04-01 | PDF
    Public transit ridership has declined in major US cities over the past decade. Integrating traditional fixed-route transit with flexible microtransit has been proposed to enhance ridership, mobility, accessibility, and sustainability. This project surveyed California transit agencies on their microtransit services to identify challenges to integrat ...
  • 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 ...
  • The Effects of the COVID19 Pandemic on Transit in the San Francisco Bay Area Summary
    The Effects of the COVID-19 Pandemic on Transit in the San Francisco Bay Area [Summary]
    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 ...
  • 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 ...
  • Volumetric Measurement of Salt Piles Using Photogrammetry LiDAR and Depth Cameras
    Volumetric Measurement of Salt Piles Using Photogrammetry, LiDAR, and Depth Cameras
    Mohammadi, Abbas ;
    Mohammadi, Pouria
    2025-04-01 | PDF
    This report presents the findings of a study conducted by the Utah Department of Transportation (UDOT) to evaluate advanced volumetric measurement technologies for accurately assessing road salt piles. The motivation for this study stems from the limitations of traditional methods, such as visual estimation and truckload weighing, which are prone t ...
  • 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 ...
  • Asset Characterization Using Automated Methods Research Summary
    Asset Characterization Using Automated Methods [Research Summary]
    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 ...
  • 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 ...
  • A Fatigue Assessment Framework for Steel Bridges Using Fiber Optic Sensors and Machine Learning
    A Fatigue Assessment Framework for Steel Bridges Using Fiber Optic Sensors and Machine Learning
    Soliman, Mohamed ;
    Mahmoud, Ahmed
    2025-04-01 | PDF
    This report discusses the results of a research project aiming at developing data-driven approaches for damage detection in steel bridges. The developed approaches utilize machine learning (ML) models coupled with strain data obtained from fiber optic sensors or traditional foil-type strain gauges to detect the damage. The report discusses the expe ...
  • 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 ...
  • 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 ...
  • Automated Assessment of Defects in Bridge Structures
    Automated Assessment of Defects in Bridge Structures
    Shafei, Behrouz ;
    Odeh, Ibrahim
    2025-04-01 | PDF
    Effective and timely bridge inspections are crucial for extending bridge lifespans and preventing catastrophic failures. Traditional inspection methods often involve manual visual assessments and can be time-consuming, labor-intensive, and prone to human error. Recent technological advancements in unmanned aerial vehicles (UAVs), artificial intelli ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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).
  • Leveraging Mobility Data Analytics to Inform Mobility Hub Development in Florida Brief
    Leveraging Mobility Data Analytics to Inform Mobility Hub Development in Florida [Brief]
    Yan, Xiang Jacob
    2025-03-01 | PDF
    Mobility hubs (MHs) can facilitate seamless transitions between various transportation modes, such as transit, ridehailing, and micromobility, enhancing multimodal travel and delivering socioeconomic benefits. To inform mobility hub planning and development in Florida cities and beyond, this project develops a multi-criteria, GIS-based MH site sele ...
  • Inspection of Flexible Filler Tendons Summary
    Inspection of Flexible Filler Tendons [Summary]
    Brown, Jeff R.
    2025-03-01 | PDF
    This research focused on developing an inspection protocol for post-tensioning (PT) ducts employing flexible filler materials for corrosion protection in bridge applications. Historically, cementitious grouts (CG) have been used to provide corrosion protection and bonding in PT systems. In contrast, flexible filler systems use wax or grease to main ...
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