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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 1101 - 1120 of 35448 results
  • Evaluation of NDOTs Sediment Barrier Practices Using Performance Data
    Evaluation of NDOT’s Sediment Barrier Practices Using Performance Data
    Perez, Michael A ;
    Donald, Wesley N.
    2024-03-01 | PDF
    To protect waterways adjacent to construction projects with disturbed land, a 50 ft (15 m) vegetated buffer or equivalent sediment controls are required. However, there is little guidance on the effectiveness of vegetated buffers in removing sediment or how sediment barriers can aid shorter buffers or replace buffers. A modeling methodology was dev ...
  • Partially Grouted Revetment for LowVolume Road Bridges Tech Transfer Summary
    Partially Grouted Revetment for Low-Volume Road Bridges [Tech Transfer Summary]
    Phares, Brent ;
    Alipour, Alice
    2024-03-01 | PDF
    The Iowa secondary road system has a large number of scour-susceptible bridges or bridges with unknown foundation conditions. While scour countermeasures have historically included conventional riprap, fully grouted riprap, and other systems, a promising option is a partially grouted revetment (also known as partially grouted riprap). Partially gro ...
  • Impact of the New Context Functional Classifications for KYTC
    Impact of the New Context Functional Classifications for KYTC
    Sandlin, Arlen ;
    Asher, Jill
    2024-03-01 | PDF
    State transportation agencies are adopting an expanded context classification system to inform project development and delivery. This system classifies roadways into one of five categories based on factors such as level of development, building densities and setbacks, multimodal user patterns and requirements, network permeability, and speed. Compa ...
  • Online Instructional Tools for Motor Carriers
    Online Instructional Tools for Motor Carriers
    Howell, Brian ;
    Walton, Jennifer
    2024-03-01 | PDF
    Commercial motor carrier customers on Kentucky highways must register and pay taxes for licensing and credentialing requirements. The Kentucky Transportation Cabinet (KYTC) provides an online Motor Carrier Portal that offers information and instructions on meeting these requirements, but customers have increasingly resorted to calling into KYTC’s m ...
  • Strengthening the Deployment of Uncrewed Aerial Systems UAS at KYTC
    Strengthening the Deployment of Uncrewed Aerial Systems (UAS) at KYTC
    Catchings, Rachel ;
    Smith, Suzanne
    2024-03-01 | PDF
    The Kentucky Transportation Cabinet (KYTC) and transportation agencies around the United States increasingly depends on uncrewed aircraft systems (UAS — also commonly known as drones) to collect data and accelerate project development and delivery. Drones let transportation practitioners safely and efficiently perform many activities, including bri ...
  • Updating ArDOT Liquefaction Evaluation Procedures
    Updating ArDOT Liquefaction Evaluation Procedures
    Wood, Clinton M. ;
    Mitra, Suman
    2024-03-01 | PDF
    There is a significant amount of uncertainty when designing piles for bridge foundations in liquefiable soil. Currently, Arkansas Department of Transportation (ARDOT) engineers use a standard penetration test (SPT)-based liquefaction spreadsheet developed 10 years ago to evaluate liquefaction triggering. Since this spreadsheet was developed, update ...
  • Asphalt Mixture Automated Testing System with Zero Intervention AMAZE
    Asphalt Mixture Automated Testing System with Zero Intervention (AMAZE)
    Zhou, Fujie ;
    Roa, Jorge
    2024-03-01 | PDF
    The Texas Department of Transportation (TxDOT) is currently facing many challenges. Three such challenges in the areas of asphalt pavements and laboratory testing involve (a) cracking and rutting distresses, (b) hiring and retaining employees, and (c) laboratory safety. TxDOT has been addressing the cracking and rutting problems by implementing a b ...
  • Asphalt Mixture Automated Testing System with Zero Intervention AMAZE Revised Training Curriculum
    Asphalt Mixture Automated Testing System with Zero Intervention (AMAZE): Revised Training Curriculum
    Zhou, Fujie ;
    Roa, Jorge
    2024-03-01 | PDF
    State highway agencies including the Texas Department of Transportation (TxDOT) are currently facing many challenges. Three such challenges involve addressing (a) the cracking and rutting distresses that are costing taxpayers billions of dollars annually, (b) the loss of both the workforce and the skills associated with the workforce, and (c) labor ...
  • Asphalt Mixture Automated Testing System with Zero Intervention AMAZE Revised User Manual
    Asphalt Mixture Automated Testing System with Zero Intervention (AMAZE): Revised User Manual
    Zhou, Fujie ;
    Roa, Jorge
    2024-03-01 | PDF
    AMAZE is a cutting-edge solution designed to revolutionize the asphalt mixture testing process. The goal of the system is to increase consistency and accuracy of test results, eliminate human error, improve efficiency, and reduce testing times. AMAZE is engineered to automatically measure four essential asphalt mixture properties: bulk specific gra ...
  • Determination of the Resistance to Motion of a Cargo Train When Driving Without a Drive
    Determination of the Resistance to Motion of a Cargo Train When Driving Without a Drive
    Sawczuk, Wojciech ;
    Kołodziejski, Sławomir
    2024-03-01 | PDF
    This study investigates the resistance forces acting on a cargo train under real operating conditions using experimental methods. By analyzing motion parameters such as speed, acceleration, and traction forces obtained through onboard measurement systems, the authors establish empirical resistance curves across various operational scenarios. The re ...
  • Literature Review of IDEALCT and IDEALRT Test Methods for Balanced Mixed Design Research Project Capsule 234B
    Literature Review of IDEAL-CT and IDEAL-RT Test Methods for Balanced Mixed Design: Research Project Capsule [23–4B]
    Salari, Saman ;
    Rupnow, Tyson
    2024-03-01 | PDF
    The objective of this project is to evaluate published literature regarding the efficacy of IDEAL-CT and IDEAL-RT test methods to characterize the performance of asphalt mixtures in the field. Many agencies have used and researched these BMD methods, and reviewing their efficiency can provide the state of Louisiana with additional tools and help ag ...
  • Literature Review and Industry Survey of Recycled Fibers from Novel and Existing Source Materials for Concrete Use
    Literature Review and Industry Survey of Recycled Fibers from Novel and Existing Source Materials for Concrete Use
    Nassiri, Somayeh ;
    Roy, Souvik
    2024-03-01 | PDF
    Research has demonstrated the multiple benefits of fibers for the early and late-age performance of concrete pavements and bridge decks. Many research studies have also shown that the expected enhancements in properties of concrete with recycled fibers could be commensurate with those of concrete reinforced with virgin fibers. However, compared wit ...
  • Implementation of Safety Prediction Methods for Texas Highways Project Summary
    Implementation of Safety Prediction Methods for Texas Highways [Project Summary]
    Geedipally, Srinivas R. ;
    Pratt, Michael P.
    2024-02-29 | PDF
    In this implementation project, researchers first conducted a pilot testing of the safety prediction methodology. Researchers selected a sample of approximately 2 hours in duration containing multiple examples in the second session to demonstrate use of the spreadsheet tools.
  • Adaptive MultipleModel Kalman Filter for GNSS Carrier Phase and Frequency Estimation Through Wideband Interference
    Adaptive Multiple-Model Kalman Filter for GNSS Carrier Phase and Frequency Estimation Through Wideband Interference
    Zhao, Wengxiang ;
    Khanafseh, Samer
    2024-02-17 | PDF
    Interference events, both intentional and unintentional, are significant threats to global navigation satellite system (GNSS) service continuity. In the presence of interference, it can be difficult for GNSS receivers to maintain continuous tracking of carrier phase and frequency. To address this issue, in place of a traditional phase-locked loop ( ...
  • Actionable Flood Warnings Based on GroundTruth Data to Support Iowa DOT BridgeWatch Platform Functionality
    Actionable Flood Warnings Based on Ground-Truth Data to Support Iowa DOT BridgeWatch Platform Functionality
    Demir, Ibrahim ;
    Muste, Marian
    2024-02-15 | PDF
    The expectation of improved flood warnings has become critical for many agencies and communities at a time when flooding is increasingly severe and widespread. Formulation of flood warnings for a specific area entails three major steps: A) forecasting the flood hazards, B) delineation of the flood maps, and C) assessment of the threats to human saf ...
  • Assessing Safety and Mobility Benefits of Autonomous Ride Sharing Services
    Assessing Safety and Mobility Benefits of Autonomous Ride Sharing Services
    Classen, Sherrilene ;
    VandeWeerd, Carla
    2024-02-14 | PDF
    We examined the user perspective about autonomous ride sharing services among older adults (50+ years of age) in three different geographic areas in Florida (Lake Nona, Port St. Lucie, and The Villages). We utilized the Autonomous Ride Sharing Services Survey and participants’ lived experiences before and after exposure to the autonomous shuttle. O ...
  • A New Approach for Identifying Safety Improvement Sites on Rural Highways A Validation Study
    A New Approach for Identifying Safety Improvement Sites on Rural Highways: A Validation Study
    Dhakal, Bishal ;
    Al-Kaisy, Ahmed
    2024-02-08 | PDF
    The research presented in this paper examines a new proposed approach for identifying safety improvement sites on rural highways. Unlike conventional approaches, the proposed approach does not require crash history, but rather utilizes classified variables for traffic volume, geometric features, and roadside characteristics that do not require acce ...
  • Transportation Infrastructure Asset Monitoring Through the Industrial InternetofThings
    Transportation Infrastructure Asset Monitoring Through the Industrial Internet-of-Things
    Jordan, Patrick ;
    Moreno, John
    2024-02-01 | PDF
    The Internet-of-Things (IoT) is a rapidly growing area of wireless communication technology that allows devices to communicate with computers and humans via the Internet. This technology goes far beyond simply connecting devices to the internet, it creates opportunities to combine data from these devices with automated systems for the purpose of an ...
  • Hydrated Lime and Liquid AntiStrip Additives MoistureInduced Damage Resistance Study
    Hydrated Lime and Liquid Anti-Strip Additives: Moisture-Induced Damage Resistance Study
    Anderson, Howard ;
    Allen, Clark
    2024-02-01 | PDF
    Stripping is a critical surface and or subsurface pavement distress affecting asphalt pavements and is caused by moisture infiltration and stressed by freeze-thaw cycles and traffic loading, leading to the loss of bond or adhesion between the aggregate and the asphalt binder. UDOT has used 1 percent hydrated lime by slurry pugmill mixing in all our ...
  • Traffic Safety Evaluation at Jturns in Minnesota
    Traffic Safety Evaluation at J-turns in Minnesota
    Moreland, Max ;
    Leuer, Derek
    2024-02-01 | PDF
    Between 2010 and 2022, 83 J-turn intersections were installed on Minnesota Department of Transportation (MnDOT) roadways. The J-turn is an alternative intersection layout that is intended to provide safety benefits by limiting the number of points within an intersection that two or more vehicle paths might intersect. Before-after analyses at J-turn ...
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