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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 421 - 440 of 35811 results
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Counting Airport Operations Using Aircraft Transponder Signals andor Aircraft Automatic Dependent SurveillanceBroadcast ADSB Data Brief
    Counting Airport Operations Using Aircraft Transponder Signals and/or Aircraft Automatic Dependent Surveillance-Broadcast (ADS-B) Data [Brief]
    Yoshigoe, Kenji
    2025-03-01 | PDF
    Accurate estimation of daily and annual aircraft operations at airports is vital for various objectives, including airport planning, funding allocation, and aviation forecasts. However, obtaining precise operational data from airports without control towers has been challenging. In 2018, the Florida Department of Transportation (FDOT) published an ...
  • Modeling and Predicting the Deterioration of Pedestrian Assets Summary
    Modeling and Predicting the Deterioration of Pedestrian Assets [Summary]
    CTC & Associates LLC
    2025-03-01 | PDF
    Pedestrian assets, particularly sidewalks, are highly susceptible to aging, adverse weather conditions, and suboptimal construction practices, often leading to rapid deterioration. This deterioration is often ignored due to the widespread misconception that pedestrian assets are low risk, resulting in many deteriorated sidewalks being left untreate ...
  • Coastal Flood Roadway Vulnerability Assessment
    Coastal Flood Roadway Vulnerability Assessment
    Bilskie, Matthew V ;
    Kim, S. Sonny
    2025-03-01 | PDF
    Coastal flood data and maps were developed using an ADvanced CIRCulation (ADCIRC) hydrodynamic model with resolution as fine as 30 m on the coastline. Annual exceedance probability (AEP) still water levels caused by storm surges were taken from the United States Army Corps of Engineers (USACE) South Atlantic Coastal Study’s (SACS) publicly availabl ...
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