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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 1221 - 1240 of 35448 results
  • Older Road Users Safety in Louisiana Understanding the Crash Contributing Factors Research Project Capsule 242SA
    Older Road Users Safety in Louisiana: Understanding the Crash Contributing Factors Research: Project Capsule [24–2SA]
    Mitran, Elisabeta ;
    Rupnow, Tyson
    2024-01-01 | PDF
    The objectives of this study are to investigate the factors contributing to older road user crashes in Louisiana and to recommend effective countermeasures to support the SHSP strategies in reducing traffic fatalities and severe injuries.
  • Modeling the Dynamic Modulus of Asphalt Mixtures Using Singlevalue Test Results Phase II Relation Between E Parameters and CT Index
    Modeling the Dynamic Modulus of Asphalt Mixtures Using Single-value Test Results Phase II: Relation Between E* Parameters and CT Index
    Romero-Zambrana, Pedro ;
    Stevens, David
    2024-01-01 | PDF
    This report outlines the development of relations between the IDEAL-CT test results and the dynamic modulus of asphalt mixtures. In this, the second phase of a four-phase study, the theoretical results obtained as part of Phase I were validated by measuring dynamic modulus and cracking tolerance index values on nine different mixtures; seven of the ...
  • Improved Load Rating Procedures for Deteriorated Unstiffened Steel Beam Ends
    Improved Load Rating Procedures for Deteriorated Unstiffened Steel Beam Ends
    Provost, Aidan ;
    Tzortzinis, Georgios
    2024-01-01 | PDF
    This report contains the contents of the project to enhance load rating methods for assessing corroded unstiffened steel beam ends for the six New England States. The first task of the project was to collect and compile inspection reports information provided by DOTs within New England. The research team was able to carefully identify trends and pa ...
  • Development of Deterioration Curves for Ohio Bridges
    Development of Deterioration Curves for Ohio Bridges
    Yoon, Yoojung ;
    Ahamed, Faysal
    2024-01-01 | PDF
    The objective of this research was to develop the deterioration curves of the primary bridge superstructure designs to understand their characteristics over time. The research methodologies involved a meticulous data collection and processing step, analyzing Ohio's historical bridge inventory dating back to the mid-1980s, followed by deterioration ...
  • Development of Deterioration Curves for Ohio Bridges Fact Sheet
    Development of Deterioration Curves for Ohio Bridges [Fact Sheet]
    Yoon, Yoojung ;
    Ahamed, Faysal
    2024-01-01 | PDF
    The objective of this research was to develop the deterioration curves of the primary bridge superstructure designs to understand their characteristics over time. The research methodologies involved a meticulous data collection and processing step, analyzing Ohio's historical bridge inventory dating back to the mid-1980s, followed by deterioration ...
  • The Future of Airports A Vision of 2040 and 2070
    The Future of Airports: A Vision of 2040 and 2070
    Le Bris, Gaël ;
    Nguyen, Loup-Giang
    2024-01-01 | PDF
    This document is the result of that five-year process, and it is the second version of the research report on the future of airports at the 20- and 50-year horizons. It should be read as a guide to understand the challenges and opportunities ahead. It features tools and technical contents documenting trends and emerging issues. Finally, it contains ...
  • Sidewalking A Toolkit for Engaging Youth in Planning and Designing Urban Mobility Futures
    Sidewalking: A Toolkit for Engaging Youth in Planning and Designing Urban Mobility Futures
    Nelischer, Claire ;
    Cuff, Dana
    2024-01-01 | PDF
    The Sidewalking toolkit supports youth mobility and youth agency by sharing effective, design-based strategies for engaging young people in envisioning their own mobility futures. We created this guide to help planners, designers, policymakers, and advocates who are already invested in supporting safe, social mobility options for youth, and who are ...
  • Investigating Heterogeneity in Private Vehicle Ownership Preferences towards Alternative Fuel Vehicles and Adoption of Shared Mobility Options
    Investigating Heterogeneity in Private Vehicle Ownership, Preferences towards Alternative Fuel Vehicles, and Adoption of Shared Mobility Options
    Iogansen, Xiatian
    ORCID ICON IMG
    2024-01-01 | PDF
    In recent decades, emerging technologies have significantly transformed the transportation sector, offering a wider range of vehicle options and mobility alternatives. However, the recent COVID-19 pandemic disrupted many aspects of daily life, likely leaving long-lasting effects that further complicate our understanding and prediction of individual ...
  • Development of a New Tool for Evaluating Infrastructure and Planning Impacts Related to Changes in Truck Traffic and Truck Technologies Project Summary
    Development of a New Tool for Evaluating Infrastructure and Planning Impacts Related to Changes in Truck Traffic and Truck Technologies [Project Summary]
    Morgan, Curtis ;
    Birgisson, Bjorn
    2023-12-31 | PDF
    This project builds on the findings of Texas Department of Transportation (TxDOT) Project 0-6984, Evaluate Potential Impacts, Benefits, Impediments, and Solutions of Automated Trucks and Truck Platooning on Texas Highway Infrastructure, completed by the Texas A&M Transportation Institute in 2020.
  • Implementation of Understanding the Impact of Autonomous Vehicles on LongDistance Travel Mode and Destination Choice in Texas Project Summary
    Implementation of Understanding the Impact of Autonomous Vehicles on Long-Distance Travel Mode and Destination Choice in Texas [Project Summary]
    Kockelman, Kara ;
    Vellimana, Maithreyi
    2023-12-31 | PDF
    As privately owned and shared autonomous vehicles (AVs and SAVs) and automated trucks (ATrucks) become available, TxDOT and partner agencies must anticipate their travel, trade, emissions, cost, and other implications. Introducing these modes can significantly alter mode choices for passenger travel and freight and impact traffic volumes and conges ...
  • 07001 Utilizing Steel Fiber Reinforced Concrete as a Substitute Reinforcement for CIPPCP Bridge Deck
    0-7001: Utilizing Steel Fiber Reinforced Concrete as a Substitute Reinforcement for CIP-PCP Bridge Deck
    Bayrak, Oguzhan ;
    Jeong, Soon Kwang
    2023-12-31 | PDF
    This research focuses on optimizing the design of cast-in-place, precast-panel (CIP-PCP) bridge decks by developing recommendations for standard ready-mix steel fiber reinforced concrete (SFRC) using domestically produced steel fibers. The project, stemming from the efficient and durable nature of CIP-PCP decks, builds upon prior work at the Univer ...
  • Development of IntegralSemiIntegral Abutments for TxDOT Bridges Project Summary Project
    Development of Integral/Semi-Integral Abutments for TxDOT Bridges [Project Summary Project]
    Zornberg, Jorge G. ;
    Mofarraj, Behdad
    2023-12-31 | PDF
    This study includes an initial comprehensive evaluation of the state-of-the-practice in the US regarding the adoption of integral and semi-integral bridges. It also involved a large-scale experimental study focusing on the effect of cyclic movements on the potential buildup of lateral earth pressures acting on the backwalls of a semi-integral bridg ...
  • Use of Rapid Setting Hydraulic Cements RSHCs for Structural Applications Project Summary
    Use of Rapid Setting Hydraulic Cements (RSHCs) for Structural Applications [Project Summary]
    Torres, Anthony ;
    Aguayo, Federico
    2023-12-31 | PDF
    This study showed that RSHC concrete can be designed to meet structural class specifications in terms of fresh (i.e., workability and working time) and hardened properties (early- and/or later-age strength). However, information is still needed to fully understand their performance in various durability-related distresses. In particular, more work ...
  • Development of a Maintenance Prioritization Assessment and Safety Tool
    Development of a Maintenance Prioritization Assessment and Safety Tool
    Swanston, Travis ;
    Soltani, Iman
    2023-12-14 | PDF
    Highway construction and maintenance work is one of the most hazardous occupations in the United States. In 2018, more than 7,000 work-zone collisions occurred on California roadways, about 2,300 resulting in injuries, and 46 involving fatalities. This research helped move toward reducing those numbers. The California Department of Transportation ( ...
  • Quantitative Performance Measures for the Caltrans System Investment Strategy
    Quantitative Performance Measures for the Caltrans System Investment Strategy
    Chandra, Shailesh ;
    Valencia, Robert
    2023-12-13 | PDF
    This research developed a robust set of quantitative performance metrics, measures, and methodologies to assess project alignment with the Climate Action Plan for Transportation Infrastructure (CAPTI). The literature review included documenting measures and metrics in published reports, peer-reviewed journals, textbooks, and presentations. Subseque ...
  • LowCement Concrete Mixture for Bridge Decks and Rails
    Low-Cement Concrete Mixture for Bridge Decks and Rails
    Das, Soumitra ;
    Morcous, George
    2023-12-08 | PDF
    Right after construction, drying shrinkage of restrained concrete bridge decks and rails causes early-age cracking, insertion of water and chemicals, and corrosion of reinforcing steel that eventually leads to delamination and spalling of concrete. The main objective of this research is to control early-age shrinkage cracking by reducing cementitio ...
  • Geographic Data for the Estimation of Peak Flow Statistics for Illinois [supporting dataset]
    Sharpe, Jennifer B ;
    Schafer, Lindsey A.
    2023-12-08 | ZIP
    The U.S. Geological Survey Central Midwest Water Science Center completed a report (Over and others, 2023) documenting methods, results, and applications of an updated flood-frequency study for the State of Illinois. The study developed regional regression equations that relate the peak-flow quantiles and the basin characteristics of selected strea ...
    Dataset
  • Elevation, Flow Accumulation, Flow Direction, and Stream Definition Data in Support of the Illinois StreamStats Upgrade to the Basin Delineation Database [supporting dataset]
    Sharpe, Jennifer B ;
    Schafer, Lindsey A.
    2023-12-08 | ZIP
    The U.S. Geological Survey (USGS), in cooperation with the Illinois Center for Transportation and the Illinois Department of Transportation, prepared hydro-conditioned geographic information systems (GIS) layers for use in the Illinois StreamStats application. These data were used to delineate drainage basins and compute basin characteristics for u ...
    Dataset
  • Roadside Safety Performance Measures for Specific Countermeasures to Protect Workers
    Roadside Safety Performance Measures for Specific Countermeasures to Protect Workers
    Duong, Anh ;
    Soltani, Iman
    2023-12-06 | PDF
    There is a need to develop new policies and practices for roadside features that support the California Department of Transportation’s (Caltrans’) safety and asset management goals. The goal is to assist highway designers in including maintenance planning strategies to improve worker safety and working conditions. Such policies and practices should ...
  • Construction of LowCracking HighPerformance Bridge Decks Incorporating New Technology Phase II
    Construction of Low-Cracking High-Performance Bridge Decks Incorporating New Technology Phase II
    Bahadori, Alireza ;
    Darwin, David
    2023-12-01 | PDF
    The construction, crack surveys, and evaluation of 12 bridge decks with internal curing provided by prewetted fine lightweight aggregate and supplementary cementitious materials following internally cured low-cracking high-performance concrete (IC-LC-HPC) specifications of Minnesota or Kansas are described, as well as those from two associated Cont ...
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