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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 261 - 280 of 35438 results
  • Testing Analysis and Load Rating of Precast Prestressed Concrete Deck Beams with Transverse Cracks
    Testing, Analysis, and Load Rating of Precast Prestressed Concrete Deck Beams with Transverse Cracks
    Andrawes, Bassem ;
    Gunasekaran, Dachina
    2025-05-01 | PDF
    This study focused on understanding the impact of transverse cracks on the residual capacity and load rating analysis of in-service precast prestressed concrete (PPC) deck beams. Two decommissioned (33 × 36 and 21 × 36) PPC deck beams were tested under four-point bending loads to assess the impact of transverse cracks on the structural performance ...
  • Evaluation of Rock Check Dam Performance using LargeScale Testing Techniques
    Evaluation of Rock Check Dam Performance using Large-Scale Testing Techniques
    Roche, Brian G ;
    Perez, Michael A
    2025-05-01 | PDF
    Conveyance channels are commonly used on highway construction projects to manage the flow of water through the project to downstream discharge points or stormwater detention practices. However, these channels can be at risk of erosion before stabilization due to high-velocity flows. A common erosion control practice in channels is a rock check dam, ...
  • Asset Condition Assessment Using AI and Computer Vision
    Asset Condition Assessment Using AI and Computer Vision
    Mashhadi, Ali ;
    Black, Clancy W.
    2025-05-01 | PDF
    UDOT faces significant challenges in manually inspecting roadside safety assets across its extensive roadway network, prompting the need for automated condition assessment solutions. This project leverages street-level image data to develop an AI-driven framework for assessing primary assets (guardrails, cable barriers, concrete barriers) and secon ...
  • Supplementary Cementitious Materials for Chloride Resistance of Bridge Decks
    Supplementary Cementitious Materials for Chloride Resistance of Bridge Decks
    Bordelon, Amanda C ;
    Clyde, Madison
    2025-05-01 | PDF
    The purpose of this report is to present the measured properties and comparison between concrete mixtures consisting of different available supplementary cementitious materials (SCMs) for the purpose of understanding which SCM provides the best chloride resistance for bridge decks in Utah. The concrete batches were created in the Utah Valley Univer ...
  • Determining Percentage of Recycled Asphalt Pavement in Asphalt Mixtures Summary
    Determining Percentage of Recycled Asphalt Pavement in Asphalt Mixtures [Summary]
    Gao, Ya ;
    Jones, Christopher
    2025-05-01 | PDF
    Drum mix plants are the primary hot-mix asphalt (HMA) production plants for most Kansas Department of Transportation (KDOT) projects. In drum mix plants, a totalizer controls the input rate of virgin aggregates and recycled asphalt pavement (RAP). In current practice, the RAP percentage is determined by the input rate shown on the totalizer. Howeve ...
  • Illinois Department of Transportations Seeding Standards and Best Management Practices
    Illinois Department of Transportation’s Seeding Standards and Best Management Practices
    Bollinger, Wesley ;
    Bhattarai, Rabin
    2025-05-01 | PDF
    To provide evidence-based revisions to Section 250 of the Illinois Department of Transportation roadside specifications manual, we conducted a literature review, an experimental planting, and a survey of previously planted roadsides. We created newly designed native seed mixes and field tested these mixes in comparison with existing IDOT mixes. Aft ...
  • Determining Percentage of Recycled Asphalt Pavement in Asphalt Mixtures
    Determining Percentage of Recycled Asphalt Pavement in Asphalt Mixtures
    Gao, Ya ;
    Jones, Christopher
    2025-05-01 | PDF
    Drum mix plants are the primary hot-mix asphalt (HMA) production plants for most Kansas Department of Transportation (KDOT) projects. In drum mix plants, a totalizer controls the input rate of virgin aggregates and recycled asphalt pavement (RAP). In current practice, the RAP percentage is determined by the input rate shown on the totalizer. Howeve ...
  • Sustainable Application of TDA in Stormwater Infiltration and Treatment
    Sustainable Application of TDA in Stormwater Infiltration and Treatment
    Natarajan, Poornima ;
    Gulliver, John S.
    2025-05-01 | PDF
    The objective of this research was to determine the efficacy and cost-effectiveness of the application of tire-derived aggregate (TDA) in stormwater treatment and management systems. We reaffirmed that TDA is an excellent means of retaining phosphate (soluble reactive phosphorus) in stormwater runoff. In addition, we found that biofilms grow on TDA ...
  • Trends and Challenges Posed by MediumDuty Trucks to the Operation and Safety of Oregon Highways
    Trends and Challenges Posed by Medium-Duty Trucks to the Operation and Safety of Oregon Highways
    Hernandez, Salvador ;
    Velasquez, Brianna
    2025-05-01 | PDF
    This study evaluates medium-duty vehicle operations and safety in Oregon to understand impact of e-commerce growth and logistics changes. The objectives were to analyze trends, assess safety risks, and provide policy recommendations. Data from the Oregon Department of Transportation (ODOT) Crash Data System, the Commercial Motor Vehicle crash datab ...
  • A Pavement Marking Inventory and Retroreflectivity Condition Assessment Method Using Mobile LiDAR Phase 2
    A Pavement Marking Inventory and Retroreflectivity Condition Assessment Method Using Mobile LiDAR – Phase 2
    Hou, Qing ;
    Remache-Patino, Bryan
    2025-05-01 | PDF
    FHWA has recently released the new MUTCD, which includes requirements for maintaining minimum levels of retroreflectivity for pavement marking. Such regulatory compliance poses a challenge to agencies because conventional visual inspection methods are labor-intensive, and the results can be subjective. MassDOT has recently completed Phase 1 of this ...
  • NETC AtaGlance Phase VII 2018 2025
    NETC At-a-Glance (Phase VII 2018 – 2025)
    Seeber, Kirsten ;
    Pulver, Jeff
    2025-05-01 | PDF
    The New England Transportation Consortium (NETC) is a research cooperative among the six New England transportation agencies: Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island and Vermont. Since its inception in 1990, NETC has been a Federal Highway Administration (FHWA) pooled fund supported by federal State Transportation and Researc ...
  • Assess Driver Distraction in an Era of Rapid Technological Change for Digital Advertising Billboards Technical Report
    Assess Driver Distraction in an Era of Rapid Technological Change for Digital Advertising Billboards: Technical Report
    Pike, Adam ;
    Shirinzad, Maryam
    2025-05-01 | PDF
    Outdoor advertising signs impact millions of travelers around the world every day. These signs are designed to attract driver attention, thus taking it away from the driving task. Driver inattention and distraction are two critical factors for road safety. Regulation of outdoor advertising signs must deal with changing technologies, including digit ...
  • 07199 Identification of Needs and Strategies for First Responder Interactions with Automated Vehicles Summary
    0-7199: Identification of Needs and Strategies for First Responder Interactions with Automated Vehicles [Summary]
    Trefz, Bradley ;
    Ivie, Ray
    2025-04-30 | PDF
    The rapid deployment of automated vehicles (AVs) presents both opportunities and challenges, especially for first responders tasked with ensuring public safety during emergencies. This project addressed critical needs and strategies for interactions between first responders and AVs. The project sought to identify the needs and strategies for Texas ...
  • Investigating the Longterm Frictional Properties and Establishing Aggregate Polishness Guidelines for Asphalt Surface Mixtures in Tennessee
    Investigating the Long-term Frictional Properties and Establishing Aggregate Polishness Guidelines for Asphalt Surface Mixtures in Tennessee
    Huang, Baoshan ;
    Zhong, Jingtao
    2025-04-30 | PDF
    The frictional properties of aggregates play a significant role in determining pavement skid resistance. To preserve natural aggregates, reclaimed asphalt pavement (RAP) has been widely used for decades. However, its application in pavement surface courses is restricted due to uncertainties about its frictional properties and other mechanical perfo ...
  • Impacts of Changing Agriculture Supply Chains on California Roads and Bridges
    Impacts of Changing Agriculture Supply Chains on California Roads and Bridges
    Chandra, Shailesh ;
    Herrera, Benny
    2025-04-28 | PDF
    Agriculture is a significant contributor to national, state, and regional economies. In 2020, California generated approximately $49.1 billion in agricultural cash receipts, comprising 13.7 percent of the nation (CA number 1). During the same year, agricultural production and processing industries accounted for 2.8 percent of the state's gross dome ...
  • Point Cloud Feature Extraction for ADA Ramp Compliance Assessment
    Point Cloud Feature Extraction for ADA Ramp Compliance Assessment
    Ghafourian, Amin ;
    Lee, Andrew
    2025-04-28 | PDF
    Automation can play a prominent role in improving efficiency, accuracy, and scalability in infrastructure surveying and assessing construction and compliance standards. This report presents a comprehensive framework for automation of geometric measurements and compliance assessment using point cloud data. The proposed approach integrates deep learn ...
  • Caltrans Risk Based Seismic Design RBSD Seismic Demand Parameters for Ordinary Bridge Columns in California
    Caltrans Risk Based Seismic Design (RBSD) – Seismic Demand Parameters for Ordinary Bridge Columns in California
    Singhal, Saurabh ;
    Zareian, Farzin
    2025-04-20 | PDF
    The Caltrans Risk-Based Seismic Design (CT-RBSD) framework is a performance-based bridge design methodology that uses reliability theory to assess the probability of seismic damage in bridge columns. Building on experimental fragility curves and statistical modeling, the approach enables engineers to design with explicit consideration of post-earth ...
  • Evaluation of Remote Operation of TruckMounted Attenuator TmaEquipped Shadow Vehicles for Use in Caltrans Operations
    Evaluation of Remote Operation of Truck-Mounted Attenuator (Tma)-Equipped Shadow Vehicles for Use in Caltrans’ Operations
    Akbari, Ali ;
    Ravani, Bahram
    2025-04-08 | PDF
    This research project investigated the application of remote driving technology for Truck Mounted Attenuator (TMA) operations. TMAs are necessary to protect the working crew from errant vehicles in support of various maintenance functions. The problem is that the driver of the TMA is susceptible to injury in high-speed crashes. The motivation is to ...
  • 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 ...
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