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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 3321 - 3340 of 35958 results
  • Environmental Impacts on the Performance of Pavement Foundation Layers
    Environmental Impacts on the Performance of Pavement Foundation Layers
    Cetin, Bora ;
    Cetin, Kristen
    2021-08-01 | PDF
    Seasonal freeze-thaw weakening has a significant effect on pavement foundation performance. The seasonal freeze-thaw cycles cause extensive damage to the pavement from frost-related problems such as frost heave, frost boils, thaw weakening, total rutting, and degradation of mechanical properties. Changes in temperature of pavement foundation geomat ...
  • Analytical Investigation of Saddle Connections for Overhead Sign Trusses with Respect to Strength and Fatigue Performance
    Analytical Investigation of Saddle Connections for Overhead Sign Trusses with Respect to Strength and Fatigue Performance
    Yu, Danqing ;
    Bennett, Caroline
    2021-08-01 | PDF
    Bridge-type overhead truss sign structures (OHTSS) are widely used over active highways across the United States. An OHTSS is comprised of a 3D truss and two support frames at each end. The structures are usually made of steel or aluminum. Many state DOTs use their own types of connections that are not documented in specifications. Since 2015, the ...
  • A New Method for Estimating Truck Queue Length at Marine Terminal Gates
    A New Method for Estimating Truck Queue Length at Marine Terminal Gates
    Qi, Yi ;
    Tao, Tao
    2021-08-01 | PDF
    No Description
  • Incorporating the 10th Edition Institute of Traffic Engineers ITE Trip Generation Rates Into Virginia Department of Transportation Guidelines
    Incorporating the 10th Edition Institute of Traffic Engineers (ITE) Trip Generation Rates Into Virginia Department of Transportation Guidelines
    Xie, Kun ;
    Cetin, Mecit
    2021-08-01 | PDF
    The Institute of Transportation Engineers (ITE) released the Trip Generation (TG) 10th edition in 2017, which significantly updated its database, and some of its trip generation rates were substantially lower than those of earlier editions. This study aims to investigate the applicability of the TG 10th edition in various Virginia contexts and to r ...
  • RealTime Traffic Analytics at Intersections
    Real-Time Traffic Analytics at Intersections
    Narasimhan, Srinivasa G. ;
    Tamburo, Robert
    2021-08-01 | PDF
    More and more city planners are taking into consideration smart mobility solutions to address transportation needs and central to smart transportation systems is access to real-time data. For example, self-driving cars offer independence for seniors and people with disabilities, greater road safety, cost savings through ride sharing, increased prod ...
  • Across Early Policy and Market Contexts Women and Men Show Similar Interest in Electric Vehicles
    Across Early Policy and Market Contexts Women and Men Show Similar Interest in Electric Vehicles
    Kurani, Kenneth S. ;
    Buch, Koral
    2021-08-01 | PDF
    While ownership and purchase of all vehicles approach gender parity, to date electric vehicles (EV) are being purchased by far more men than women. Prior analysis from California finds no reason in the available data why this difference persists. This report extends that analysis across 12 other U.S. states with varying, but generally less supporti ...
  • Spatial Modeling of Future Light and HeavyDuty Vehicle Travel and Refueling Patterns in California
    Spatial Modeling of Future Light- and Heavy-Duty Vehicle Travel and Refueling Patterns in California
    Acharya, Tri Dev ;
    Jenn, Alan T
    2021-08-01 | PDF
    A spatial optimization model was developed for deploying, over the next two decades, hydrogen refueling stations for heavy-duty zero-emission hydrogen vehicles. The model assigns trips to vehicles by applying a routing algorithm to travel demand data derived from another model—the California Statewide Travel Demand Model (developed by the Californi ...
  • DataDriven Mobility Strategies for Multimodal Transportation
    Data-Driven Mobility Strategies for Multimodal Transportation
    Wu, Yao-Jan ;
    Yang, Xianfeng (Terry)
    2021-08-01 | PDF
    Multimodal transportation systems (e.g., walking, cycling, automobile, public transit, etc.) are effective in increasing people’s travel flexibility, reducing congestion, and improving safety. Therefore, it is critical to understand what factors would affect people’s mode choices. With advanced technology, such as connected and automated vehicles, ...
  • Evaluation and Enhancement of the Florida Statewide Model Deliverable 6 Final Report
    Evaluation and Enhancement of the Florida Statewide Model: Deliverable 6 –Final Report
    Lee, Ming ;
    Li, Chen
    2021-08-01 | PDF
    This project developed a roadmap for future model enhancements of the Florida Statewide Model (FLSWM) in light of emerging planning issues and proposed enhancement strategies incorporating advanced demand modeling techniques. The roadmap was developed with accomplishment of three tasks: literature review, model evaluation with scenario analysis, an ...
  • Data Fusion for Nonmotorized Safety Analysis
    Data Fusion for Nonmotorized Safety Analysis
    Sener, Ipek N. ;
    Munira, Silvy
    2021-08-01 | PDF
    This project explored an emerging research territory, the fusion of nonmotorized traffic data for estimating reliable and robust exposure measures. Fusion mechanisms were developed to combine five bike demand data sources in Austin, Texas, and the fused estimate was applied in two crash analyses. The research was divided into three sequential stage ...
  • Capacity and Cost Benefits of Super 2 Corridors
    Capacity and Cost Benefits of Super 2 Corridors
    Brewer, Marcus A. ;
    Barrette, Timothy D
    2021-08-01 | PDF
    Super 2 corridors with passing lanes provide operational benefits to traditional two-lane highways by creating passing opportunities and reducing delay and crashes, leading to increased use of Super 2 corridors across Texas. However, as more passing lane length is added to a Super 2 corridor, the more it may resemble a traditional four-lane alignme ...
  • Using Topic Modeling To Identify Public Opinion on Public Transportation During the COVID19 Pandemic
    Using Topic Modeling To Identify Public Opinion on Public Transportation During the COVID-19 Pandemic
    Taleqani, Ali Rahim ;
    Ezekwem, Kenechukwu
    2021-08-01 | PDF
    This study examines public opinion toward transit during the COVID-19 pandemic. This was accomplished through topic modeling using social media posts on Twitter. Results showed how discussion regarding public transit changed during the first several months of 2020. This study also shared lessons learned while developing the problem statement and me ...
  • Impact of COVID19 on Disadvantaged Business Enterprises in Minnesota
    Impact of COVID-19 on Disadvantaged Business Enterprises in Minnesota
    Gaidzanwa, Moira ;
    Stewart, Rebecca
    2021-08-01 | PDF
    Minnesota’s Office of Civil Rights at the Minnesota Department of Transportation administers the Disadvantaged Business Enterprise (DBE) program. The DBE program is intended to remedy past and current discrimination against disadvantaged business enterprises, ensure a level playing field and foster equal opportunity in DOT-assisted contracts, impro ...
  • Seasonal Use of Ohio Department of Transportation Bridges by Bats
    Seasonal Use of Ohio Department of Transportation Bridges by Bats
    Environmental Solutions & Innovations, Inc.  ...
    2021-08-01 | PDF
    The Ohio Department of Transportation (ODOT) is required to inspect bridge structures for presence of bats prior to repair, maintenance, or removal. Many bridges inspected do not contain bats, but evidence of bat presence can result in project delays, added costs, and increased impacts to listed species. This study aimed to facilitate understanding ...
  • Exploration of CorridorBased Tolling Strategies for Virginias Express Toll Lanes
    Exploration of Corridor-Based Tolling Strategies for Virginia’s Express Toll Lanes
    Zhu, Shanjiang ;
    Cetin, Mecit
    2021-08-01 | PDF
    Virginia has invested significant resources in the development of express toll lanes (ETLs), which adjust toll rates dynamically based on the level of toll lane usage. A tool is needed to investigate the potential impact of the I-66 Outside-the-Beltway (OTB) ETLs on regional traffic patterns. This study developed a microscopic traffic simulation mo ...
  • How do Environmental Factors Affect Drivers Gaze and Head Movements
    How do Environmental Factors Affect Drivers’ Gaze and Head Movements?
    Tavakoli, Arash ;
    Balali, Vahid
    2021-08-01 | PDF
    Studies have shown that environmental factors affect driving behaviors. For instance, weather conditions and the presence of a passenger have been shown to significantly affect the speed of the driver. As one of the important measures of driving behavior is the gaze and head movements of the driver, such metrics can be potentially used towards unde ...
  • Evaluation of LongTerm Impacts of Early Opening of Concrete Pavements
    Evaluation of Long-Term Impacts of Early Opening of Concrete Pavements
    Khazanovich, Lev ;
    Kosar, Katelyn
    2021-08-01 | PDF
    Due to an increase in demand to shorten construction time as much as possible, the purpose of this project was to determine the optimum strength for concrete pavement before opening it to traffic and without jeopardizing long-term performance. Six test cells in MnDOT’s MnROAD project were constructed in 2017 with varying degrees of early loading. V ...
  • Technical and Financial Feasibility Study for Installation of Solar Panels at IDOTOwned Facilities
    Technical and Financial Feasibility Study for Installation of Solar Panels at IDOT-Owned Facilities
    Rusk, Todd ;
    Siegel, Ryan
    2021-08-01 | PDF
    The Smart Energy Design Assistance Center assessed the administrative, technical, and economic aspects of feasibility related to the procurement and installation of photovoltaic solar systems on IDOT-owned buildings and lands. To address administrative feasibility, we explored three main ways in which IDOT could procure solar projects: power purcha ...
  • Evaluation of Geosynthetics Use in Pavement Foundation Layers and Their Effects on Design Methods
    Evaluation of Geosynthetics Use in Pavement Foundation Layers and Their Effects on Design Methods
    Qamhia, Issam I. A. ;
    Tutumluer, Erol
    2021-08-01 | PDF
    This report presents findings of a research effort aimed at reviewing and updating existing Illinois Department of Transportation (IDOT) specifications and manuals regarding the use of geosynthetic materials in pavements. The project consisted of three tasks: evaluate current IDOT practice related to the use of geosynthetics; review research and st ...
  • Round Robin Testing Program for the Indirect Tensile Cracking Test at Intermediate Temperature Phase I
    Round Robin Testing Program for the Indirect Tensile Cracking Test at Intermediate Temperature: Phase I
    Habbouche, Jhony ;
    Boz, Ilker
    2021-08-01 | PDF
    The indirect tensile cracking test (referred to herein as “the IDT-CT”) was recommended for use in balanced mix design (BMD) specifications to address cracking susceptibility of dense-graded surface mixtures with A and D designations in Virginia. The test method for the IDT-CT, ASTM D8225-19, does not currently contain a precision statement for the ...
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