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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 1501 - 1520 of 36114 results
  • Utilizing Video Analytics With Connected Vehicles for Improved Safety Research Report
    Utilizing Video Analytics With Connected Vehicles for Improved Safety – Research Report
    Good, Amanda ;
    Butler, Sarah
    2024-01-01 | PDF
    Focus of this research was to assess the current capabilities of video analytics within the market and to validate the potential value for implementing the systems in Michigan. Multiple video analytic vendors partnered to demonstrate the technology in predefined use cases at a specific location in southeast Detroit. The data results implied the tec ...
  • Confinement Effect of Narrow Baseplates or Reaction Area on Anchor Breakout Part 3
    Confinement Effect of Narrow Baseplates or Reaction Area on Anchor Breakout, Part 3
    Suksawang, Nakin ;
    Nolan, Steven
    2024-01-01 | PDF
    The AASHTO Committee on Bridges and Structures has approved the updated ACI CODE-318, 2019 edition (ACI CODE 318-19,) into the 10th edition of the AASHTO LRFD Bridge Design Specifications. This would allow the adoption of screw anchor designs that benefit from rapid, reliable, and simplified installation procedures. However, the ACI CODE approach h ...
  • 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 ...
  • 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 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.
  • Evaluation of Bridge Deck Winter Weather Warning Systems
    Evaluation of Bridge Deck Winter Weather Warning Systems
    Gates, Timothy J. ;
    Keshari, Sagar
    2023-12-22 | PDF
    Warning signs are typically deployed at bridges to warn motorists of potential icy surface conditions on the bridge, although the effectiveness of these signs is questionable. One potential improvement is the bridge deck warning system (BDWS), which activates a flashing warning sign border or beacon based on real-time weather and bridge surface dat ...
  • 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 ...
  • 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
  • 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
  • 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 ...
  • Unticketing An UpsideDown Approach to Speed Compliance
    Unticketing: An Upside-Down Approach to Speed Compliance
    Shaw, John W ;
    Litteral, Theresa
    2023-12-01 | PDF
    Although research and practical experience show that penalties and incentives are both powerful motivators of human behavior, past approaches for addressing speeding and other routine traffic violations have almost always been punitive. Intercepting traffic violators is labor-intensive, is risky in terms of officer safety, and can amplify pre-exist ...
  • Effective Management and Emerging Best Practices of Geotechnical and Utilities Risks in Alternate Delivery
    Effective Management and Emerging Best Practices of Geotechnical and Utilities Risks in Alternate Delivery
    Ashuri, Baabak ;
    Macedo, Jorge
    2023-12-01 | PDF
    In recent decades, state transportation authorities (STAs) such as the Georgia Department of Transportation (GDOT) have increasingly relied upon alternative contracting methods (ACMs) to deliver complex surface transportation infrastructure projects. ACM delivery allocates greater levels of responsibility to the private sector for the completion of ...
  • Rapid Safety Assessment Tool for NonConventional Roadway Designs and Emerging Technologies Innovative Artificial Intelligence Application
    Rapid Safety Assessment Tool for Non-Conventional Roadway Designs and Emerging Technologies: Innovative Artificial Intelligence Application
    Ahmed, Mohamed ;
    Mohamed, Ahmed
    2023-12-01 | PDF
    Traditional safety assessment methodologies are profoundly dependent on reactive crash data. The Highway Safety Manual (HSM) approach recommends 3-5 worth of crash data before and after the implementation of safety countermeasures. Waiting for such a long period of time might not be feasible to address safety issues at various roadway facilities. F ...
  • Evaluation of Otta Seal Surfacing for LowVolume Roads in Iowa Phase II Study Comprehensive Laboratory Evaluation and Characterization and FullScale Field Implementation
    Evaluation of Otta Seal Surfacing for Low-Volume Roads in Iowa, Phase II Study: Comprehensive Laboratory Evaluation and Characterization and Full-Scale Field Implementation
    Jibon, Md ;
    Yang, Bo
    2023-12-01 | PDF
    Iowa has over 110,000 miles of roads, and they frequently support local residential vehicles as well as heavy trucks. Traditional bituminous surface treatments (BST) could be employed to maintain these roads properly, but these treatments typically require high-quality materials and standard construction equipment. Otta seal is a relatively new BST ...
  • Regional Emergency Evacuation Analysis in Traffic With Connected and Autonomous Vehicles Research Brief
    Regional Emergency Evacuation Analysis in Traffic With Connected and Autonomous Vehicles [Research Brief]
    Lu, Pan ;
    Huang, Ying
    2023-12-01 | PDF
    Researchers focused on three research issues: 1) predicting and making recommendations for future evacuations under wildfire conditions using connected vehicle data, 2) driving behaviors in wildfire evacuations, and 3) autonomous vehicle perceptions in winter conditions. This research addresses the urgent need for enhanced emergency evacuation stra ...
  • Development of Approach Transition From Box Beam Guardrail to Concrete Parapet
    Development of Approach Transition From Box Beam Guardrail to Concrete Parapet
    Bligh, Roger P. ;
    Sheikh, Nauman M.
    2023-12-01 | PDF
    This research is a step in the Wyoming Department of Transportation’s ongoing efforts to implement the Manual for Assessing Safety Hardware (MASH) to enhance roadside safety and reduce the severity of run-off-road crashes. The objective of this research was to develop a MASH Test Level 3 (TL-3) compliant stiffness transition from box beam roadside ...
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