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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 3781 - 3800 of 36908 results
  • Green Charging of Electric Vehicles Under a NetZero Emissions Policy Transition in California
    Green Charging of Electric Vehicles Under a Net-Zero Emissions Policy Transition in California
    Jenn, Alan ;
    Brown, Austin
    2021-08-01 | PDF
    California has many aggressive climate policies, primarily aimed at individual sectors. This study explores untapped policy opportunities for interactions between sectors, specifically between the transportation and the electricity grid. As electric vehicles become more prevalent, their impact on the electricity grid is directly related to the aggr ...
  • Understanding Pedestrian Injuries and Social Equity
    Understanding Pedestrian Injuries and Social Equity
    Roll, Josh ;
    McNeil, Nathan
    2021-08-01 | PDF
    Past research and planning has highlighted the existence of pedestrian injury disparities throughout the US and some local agencies have performed cursory analysis in Oregon. However, no statewide analysis of pedestrian injuries in Oregon has been completed to see how these injury outcomes differ by race and income. This report aims to help better ...
  • Measuring Corrosion Conditions in Mechanically Stabilized Earth Walls
    Measuring Corrosion Conditions in Mechanically Stabilized Earth Walls
    Parsons, Robert ;
    Han, Jie
    2021-08-01 | PDF
    KDOT extensively utilizes mechanically stabilized earth (MSE) walls, typically with coarse aggregate backfill. Previous projects K-TRAN: KSU-15-6 and K-TRAN: KU-15-5 tested the aggregate material from MSE walls under construction. KU identified that several of the clean aggregate samples contained some fines, likely from crushing of the aggregate, ...
  • A Precast Pier System for Accelerated Bridge Construction ABC in Idaho
    A Precast Pier System for Accelerated Bridge Construction (ABC) in Idaho
    Mashal, Mustafa ;
    Acharya, Mahesh
    2021-08-01 | PDF
    Accelerated Bridge Construction (ABC) in seismic regions is currently a research focal point. ABC is bridge construction that uses innovative planning, design, materials, and construction methods in a safe and cost-effective manner to reduce the onsite construction time that occurs when building new bridges or replacing and rehabilitating existing ...
  • COVID19 Impacts on Speed and Safety for Minnesota Roads and Work Zones
    COVID-19 Impacts on Speed and Safety for Minnesota Roads and Work Zones
    Hawkins, Neal ;
    Hallmark, Shauna
    2021-08-01 | PDF
    Reduced traffic volumes resulting from COVID-19, along with the strain on enforcement during the pandemic, are thought to have produced higher speeds and more aggressive driving. Understanding the magnitude of speeding and other driver behaviors requires measurement and contrast. This project quantifies reductions in volume and the resulting differ ...
  • Reclaimed Stabilized Base Stabilizing Agent Selection and Design
    Reclaimed Stabilized Base: Stabilizing Agent Selection and Design
    Khorasani, Ali ;
    Ghazanfari, Ehsan
    2021-08-01 | PDF
    Reclaimed stabilized base (RSB) is a common technique utilized to rehabilitate roadways. RSB involves reclaiming the base material and adding a stabilizing agent to increase the strength and durability of the base/subbase structure. This technique involves pulverizing some of the existing pavement along with a portion of the underlying base materia ...
  • 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 ...
  • 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 ...
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