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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 321 - 340 of 36585 results
  • Polymer Concrete Joints for Precast Bridge Elements in Accelerated Construction
    Polymer Concrete Joints for Precast Bridge Elements in Accelerated Construction
    Pokharel, Sammelan ;
    Moustafa, Mohamed A.
    2025-12-01 | PDF
    Accelerated Bridge Construction (ABC) relies on prefabricated bridge element systems (PBES) to reduce construction time and minimize traffic disruption. In such systems, closure joints play a critical role in ensuring structural continuity and long-term durability. Conventional cementitious closure materials often require extended curing times and ...
  • Asphalt Pavement Industry Survey on Recycled Materials and WarmMix Asphalt Usage 2024 15th Annual Asphalt Pavement Industry Survey
    Asphalt Pavement Industry Survey on Recycled Materials and Warm-Mix Asphalt Usage 2024 [15th Annual Asphalt Pavement Industry Survey]
    Willis, J. Richard ;
    Williams, Brett A.
    2025-12-01 | PDF
    A shared goal of the Federal Highway Administration (FHWA) and the National Asphalt Pavement Association (NAPA) is to support and promote resource efficient practices, such as the use of recycled materials and warm-mix asphalt (WMA). The use of recycled materials, primarily reclaimed asphalt pavement (RAP) and reclaimed asphalt shingles (RAS), in a ...
  • Development and Validation of a Methodology to Estimate Retroreflectivity of Pavement Markings Using LiDAR
    Development and Validation of a Methodology to Estimate Retroreflectivity of Pavement Markings Using LiDAR
    Mohammadi, Abbas ;
    Medina, Juan
    2025-12-01 | PDF
    Longitudinal pavement markings significantly affect traffic safety, particularly in adverse weather and nighttime conditions when crashes and fatalities are often overrepresented. Given the wide range of factors affecting the performance of pavement markings, periodic monitoring is needed to ensure their integrity and adequate retroreflectivity lev ...
  • MultiSource Comprehensive Program to Assess Monitor and Report Retroreflectivity of Pavement Markings
    Multi-Source Comprehensive Program to Assess, Monitor, and Report Retroreflectivity of Pavement Markings
    Mohammadi, Abbas ;
    Medina, Juan C.
    2025-12-01 | PDF
    This research investigates the feasibility of estimating retroreflectivity of durable longitudinal pavement markings using multi-source data to reduce UDOT's reliance on costly specialized field inspections. The study uses a combination of existing datasets, mobile LiDAR point clouds, street-level roadway imagery, and historical retroreflectivity m ...
  • Connected Vehicle Winter Safety Improvement With Infrared Thermography Technology
    Connected Vehicle Winter Safety Improvement With Infrared Thermography Technology
    Zhu, Xuan ;
    Yang, Xianfeng (Terry)
    2025-12-01 | PDF
    The primary objective of this research is to utilize dual-spectrum cameras, optical, and infrared thermography (IRT) cameras, to detect slippery road spots and high-crash-risk locations in winter seasons, using field evaluations and machine learning to improve detection algorithms. This capability can be used to detect road surface snow/ice pattern ...
  • Marketing and Education Budget for Implementation of New Transit Technology Guidebook
    Marketing and Education Budget for Implementation of New Transit Technology [Guidebook]
    Ketterl, Mona ;
    Dutta, Utpal
    2025-11-30 | PDF
    Michigan’s public transit agencies face increasing challenges in adopting new technologies due to limited funding, staffing constraints, and varying technical capacity. The purpose of this project was to identify practical strategies to support the planning, marketing, and implementation of new transit technologies across Michigan. The research met ...
  • Marketing and Education Budget for Implementation of New Transit Technology Report
    Marketing and Education Budget for Implementation of New Transit Technology [Report]
    Ketterl, Mona ;
    Dutta, Utpal
    2025-11-30 | PDF
    Michigan’s public transit agencies face increasing challenges in adopting new technologies due to limited funding, staffing constraints, and varying technical capacity. The purpose of this project was to identify practical strategies to support the planning, marketing, and implementation of new transit technologies across Michigan. The research met ...
  • Comprehensive Study on the Behavior of Steel Girder Bridges
    Comprehensive Study on the Behavior of Steel Girder Bridges
    Masoudi, Mohammad Javad ;
    Song, Wei
    2025-11-30 | PDF
    This research investigates the impact of cross-frame detailing on the behavior of horizontally curved and skewed steel I-girder bridges. An analysis procedure based on three-dimensional (3D) finite element (FE) method is developed to accurately capture the complex behavior of steel girder bridges with various cross-frame detailing methods. By follo ...
  • Barrier Striping for the Reduction of Accidents Project Summary Report
    Barrier Striping for the Reduction of Accidents [Project Summary Report]
    Kutela, Boniphace ;
    Geedipally, Srinivas
    2025-11-30 | PDF
    The research team reviewed past practices for barrier delineation and evaluated barrier striping at several locations in Texas. Five existing sites with barrier striping were analyzed using crash data. In addition, striping was installed at a high-crash location for before-and-after evaluation. The study considered crash history, roadway and traffi ...
  • Autonomous Drone Prototype for Bridge Inspection and Maintenance
    Autonomous Drone Prototype for Bridge Inspection and Maintenance
    Su,Gaofeng ;
    Yang, Teaya
    2025-11-30 | PDF
    This report presents a comprehensive pipeline for the autonomous visual inspection of bridges using drones. It details the architecture of a vision-based autonomous flight stack designed for operation without GPS, alongside the design of the custom drone prototype. The system’s performance is validated through three flight tests, including deployme ...
  • Best Practices for Implementing Driving Simulators in INDOT Driver Training
    Best Practices for Implementing Driving Simulators in INDOT Driver Training
    Chang, Soowon ;
    Debs, Luciana
    2025-11-26 | PDF
    This study supports the Indiana Department of Transportation’s (INDOT) initiative to enhance driver training through the strategic use of driving simulators. Traditional driving training methods are limited by seasonal variability and safety concerns. To address this, this project evaluated the role of simulators in improving driver preparedness, s ...
  • Framework and Methodology for RiskBased Bridge and Tunnel Asset Management RiskBased Asset Ranking and Corridor Prioritization
    Framework and Methodology for Risk-Based Bridge and Tunnel Asset Management: Risk-Based Asset Ranking and Corridor Prioritization
    Yang, David Y. ;
    Khosravifar, Arash
    2025-11-10 | PDF
    This report presents the results of Phase II of the project, "Framework and Methodology for Risk-based Bridge and Tunnel Asset Management". The research was carried out at Portland State University in collaboration with engineers and officials at the Oregon Department of Transportation (ODOT) and Federal Highway Administration (FHWA). Using the fra ...
  • Experimental Investigation of Development Length Required for LargeDiameter Headed Reinforcing Bars in Tension
    Experimental Investigation of Development Length Required for Large-Diameter Headed Reinforcing Bars in Tension
    Asgharpour, Naveed ;
    Raman, Rahul
    2025-11-10 | PDF
    The study presented in this report was to investigate the anchorage capacities of No. 14 and No. 18 headed bars, including the influence of the embedment length, concrete strength, head size, parallel tie reinforcement, and bar group on the anchorage strength, and evaluate the applicability of the development length requirements for No. 11 or small ...
  • Review and Evaluation of Concrete Pavement Design Method in Alabama
    Review and Evaluation of Concrete Pavement Design Method in Alabama
    Wu, Shenghua ;
    Kang, Min-wook
    2025-11-07 | PDF
    Concrete pavements constitute only about 2% of Alabama’s highway system, yet they provide durable and low-maintenance performance capable of handling heavy traffic and environmental challenges. The Alabama Department of Transportation (ALDOT) currently utilizes the AASHTO 1993 design guide, which, while reliable, often produces conservative and ove ...
  • Continued Deployment of Indiana Work Zone Analytics
    Continued Deployment of Indiana Work Zone Analytics
    Overall, Myles W. ;
    Mukai, Justin
    2025-11-07 | PDF
    Work zones along interstates often have increased congestion and crash rates when locations are close to or over capacity. Having agile monitoring methods to identifying emerging issues and challenges can provide data to transportation agency decision makers to refine maintenance of traffic plans and inform future designs. This study developed tech ...
  • Worksite Speed Control System WSCS
    Worksite Speed Control System (WSCS)
    Desai, Jairaj C. ;
    Sakhare, Rahul Suryakant
    2025-11-07 | PDF
    This study evaluates the effectiveness of Speed Safety Camera (SSC) deployments in reducing traffic speeds through four interstate work zones in Indiana in accordance with Indiana State Law House Enrolled Act (HEA) 1015. The initial deployment of SSC was along interstate I-70 in August 2024, with deployments on I-69, I-465, and I-65 subsequently fo ...
  • Research Support to INDOT on I465 Southeast Variable Speed Limit and Ramp Meter Project
    Research Support to INDOT on I-465 Southeast Variable Speed Limit and Ramp Meter Project
    Desai, Jairaj C. ;
    Gartner, Christopher
    2025-11-07 | PDF
    Traditionally, crash data, crash risk models, video recordings and user surveys have been utilized by agencies to measure the safety benefits of ramp metering technology. Connected vehicle data can now provide an agile evaluation alternative for quantifying impact of ramp meter deployments. Furthermore, in contrast to crash data, connected vehicle ...
  • Enhancing ADOT Communications to Reduce Highway Litter in Arizona
    Enhancing ADOT Communications to Reduce Highway Litter in Arizona
    Washburn, Lauren C. ;
    O’Callaghan, Nicholas
    2025-11-04 | PDF
    This report summarizes a statewide study commissioned by the Arizona Department of Transportation (ADOT) to inform and enhance anti-litter communications and operational litter remediation practices as they pertain to the Arizona state highway system. The project team conducted communications research, developed a highway visible litter characteriz ...
  • Evaluating the Virginia Department of Transportations Potential Use of Electric Pickup Trucks Using Field Test Data supplemental file
    Evaluating the Virginia Department of Transportation’s Potential Use of Electric Pickup Trucks Using Field Test Data [supplemental file]
    Virginia Transportation Research Council (VTRC)
    2025-11-01 | XLSX
    This Excel Spreadsheet contains the Electric Vehicle Decision Support Tool: The life cycle cost analysis tool allows for a life cycle cost analysis comparison of multiple vehicles, including electric vehicles (EV), hybrid electric vehicles (HEV), and internal combustion engine vehicles (ICEV). The tool requires inputs about how the vehicle will be ...
    Supporting Files
  • Development of a Design Methodology for Geosynthetic Reinforced Pavement Using Finite Element Numerical Modeling
    Development of a Design Methodology for Geosynthetic Reinforced Pavement Using Finite Element Numerical Modeling
    Abu-Farsakh, Murad Y. ;
    Zadehmohamad, Mehdi
    2025-11-01 | PDF
    This study was completed using finite element (FE) analysis to assess the benefits of using geosynthetic reinforcement in flexible pavements. A comprehensive parametric study was performed to determine the effect of different variables like asphalt layer thickness, base thickness, geosynthetic type and stiffness, and subgrade stiffness for low, med ...
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