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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 941 - 960 of 36049 results
  • 07161 Develop Settlement Criteria and Design Approach for Embankments and Retaining Walls Built on Compressible Soils
    0-7161: Develop Settlement Criteria and Design Approach for Embankments and Retaining Walls Built on Compressible Soils
    Huang, Jie ;
    Bin-Shafique, Sazzad
    2024-08-31 | PDF
    The overarching objective of this project is to identify settlement criteria for embankments and retaining walls and develop a systematic soil improvement design tool to facilitate the method selection and construction time and cost estimation. There is a consensus that the post-construction settlement has profound impacts on the service conditions ...
  • Guidelines for Utilization of Field Sands in Superpave Mixtures of Texas Project Summary Report
    Guidelines for Utilization of Field Sands in Superpave Mixtures of Texas [Project Summary Report]
    Abdallah, Imad N. ;
    Nazarian, Soheil
    2024-08-31 | PDF
    The objectives of this project were to determine the upper limit of specific field sand in a mix given the amount of active clay present in it, define the process to determine the clay content, and measure how they affect the performance of the asphalt mixtures. To address these objectives, this study focused on developing and verifying the guideli ...
  • PostNEVI Electric Vehicle Infrastructure Research Freight Fleet and MultiFamily Housing Project Summary Report
    Post-NEVI Electric Vehicle Infrastructure Research (Freight, Fleet, and Multi-Family Housing) [Project Summary Report]
    Kraus, Edgar ;
    Kuzio, Jacqueline
    2024-08-31 | PDF
    Researchers conducted three stakeholder workshops to assess stakeholder needs and concerns, opportunities for stakeholder coordination, and long-term EV infrastructure strategy considerations. Researchers also conducted interviews with peer states and metropolitan planning organizations. These efforts resulted in the development of a prototype EV c ...
  • Integrated SiteManager and Pavement Analyst Database on an Online Platform Project Summary Report
    Integrated SiteManager and Pavement Analyst Database on an Online Platform [Project Summary Report]
    Bhasin, Amit ;
    Rahman, Syeda
    2024-08-31 | PDF
    The research team extracted material and project related information from the SMGR and DCIS databases, and pavement surface conditions, distress measures, and locations of all contracted and in-house construction and maintenance projects identified for four-year planning cycles from the Pavement Analyst database. The research team queried, integrat ...
  • Develop and Validate Precast Column Solutions for Texas Bridges Summary Report
    Develop and Validate Precast Column Solutions for Texas Bridges [Summary Report]
    Adediwura, Jade ;
    Bayrak, Oguzhan
    2024-08-31 | PDF
    The Texas Department of Transportation (TxDOT) initiated Project 0-7089 to explore the potential of using precast bridge substructures, particularly focusing on precast column solutions for multi- column bents. The project aimed to address the challenges and benefits associated with precast columns, which are known to expedite construction processe ...
  • Synthesis Pavement Widening Best Practices Project Summary Report
    Synthesis: Pavement Widening Best Practices [Project Summary Report]
    Wilson, Bryan ;
    Goehl, Darlene
    2024-08-31 | PDF
    The research team performed a literature review to determine the current state of the practice and emerging approaches on the following pavement widening topics: Pre-design pavement evaluation, sampling, and testing.• Pavement layer and cross-section design practices.• Material performance, availability, and selection practices.• Plans, specificati ...
  • 5704901 Implementation of Improving and Communicating Speed Management Practices Summary
    5-7049-01: Implementation of Improving and Communicating Speed Management Practices [Summary]
    Fitzpatrick, Kay ;
    Venglar, Steven P.
    2024-08-30 | PDF
    Posted speed limits (PSLs) are a highly complex issue involving engineering, human factors, and political and societal concerns. On a national level, recent research along with calls to change how speed limit are set, especially for city streets, have generated extensive discussion on future speed limit setting procedures. Recent Texas Department o ...
  • Pavement Deterioration Models for Pavement Management
    Pavement Deterioration Models for Pavement Management
    Woods, Mark ;
    Alam‐Khan, Shafkat
    2024-08-30 | PDF
    The Vermont Agency of Transportation (VTrans) oversees the ownership and maintenance of an extensive network comprising 3,100 centerline miles of paved public roads. In 2004, VTrans pioneered the development of pavement performance models, utilizing historical pavement performance data categorized by the underlying structure and paving surface trea ...
    Supporting Files
  • Illinois Highway Materials Sustainability Efforts 2023
    Illinois Highway Materials Sustainability Efforts 2023
    Senger, Kelly
    2024-08-28 | PDF
    The Illinois Department of Transportation (IDOT) continues to use a variety of reclaimed and recycled materials in highway construction. Recycled materials are used in highway construction to supplement aggregates, concrete, hot-mix asphalt (HMA), steel, and sealants, as well as for soil modification and pavement markings. This report summarizes th ...
  • Leveraging Mobility Data Analytics to Inform Mobility Hub Development in Florida Project BED31 TWO 97714
    Leveraging Mobility Data Analytics to Inform Mobility Hub Development in Florida Project BED31 TWO 977-14
    Yan, Xiang Jacob ;
    Lyu, Duanya
    2024-08-20 | PDF
    Mobility hubs (MHs) can facilitate seamless transitions between various transportation modes, such as transit, ridehailing, and micromobility, enhancing multimodal travel and delivering socioeconomic benefits. To inform mobility hub planning and development in Florida cities and beyond, this project develops a multi-criteria, GIS-based MH site sele ...
  • The Effectiveness of Longitudinal Rumble Strips on Indiana Roads
    The Effectiveness of Longitudinal Rumble Strips on Indiana Roads
    Barahona, Mario ;
    Guo, Qiming
    2024-08-15 | PDF
    Rumble strips are designed and deployed to reduce run-off-road and head-on crashes by alerting drivers about near-lane departures. Although they have been widely used, their operational safety effectiveness still needs to be investigated under various operational conditions. Rumble strips may have different widths and be installed on edge, shoulder ...
  • Geotechnical Asset Management GAM Phase II Project Capsule 244GT
    Geotechnical Asset Management (GAM) Phase II: Project Capsule [24-4GT]
    Ferguson, Nicholas ;
    Rupnow, Tyson
    2024-08-15 | PDF
    The research objectives for this project can be summarized as follows: 1. Grow Geotechnical Asset Management (GAM) in Louisiana. 2. Build/rebuild a culvert inventory database that will benefit multiple DOTD sections. 3. Establish condition and consequence criteria for culvert risk determinations and maintenance priorities. 4. Develop a roadmap for ...
  • Vermont Smart Growth Vehicle Miles Traveled and Greenhouse Gas Research
    Vermont Smart Growth, Vehicle Miles Traveled, and Greenhouse Gas Research
    Sentoff, Karen ;
    Mansfield, Theodore
    2024-08-12 | PDF
    The Global Warming Solutions Act (GWSA) set targets for Vermont to reduce greenhouse gas (GHG) emissions to 80% below 1990 levels by 2050. Recognizing that transportation accounts for the largest share of the State’s total GHG emissions, the Climate Action Plan identified reduction in vehicle miles traveled (VMT) as a key pathway to meet targets an ...
  • Initiating Seed Production for Effective Establishment of Native Plants on Roadsides in New England
    Initiating Seed Production for Effective Establishment of Native Plants on Roadsides in New England
    Campanelli, John ;
    Kuzovkina, Julia
    2024-08-09 | PDF
    This report provides guidance for the establishment of native habitats in New England. It describes the seed mixes of native plants for various soil conditions, establishment of native habitats using various techniques, guidelines for conservation mowing and ecotypic seed production in the region.
  • Framework and Methodology for RiskBased Bridge and Tunnel Asset Management Objective Risk Assessment and Network Level Evaluation
    Framework and Methodology for Risk-Based Bridge and Tunnel Asset Management: Objective Risk Assessment and Network Level Evaluation
    Yang, David Y. ;
    Khosravifar, Arash
    2024-08-02 | PDF
    This report presents the results of the project on establishing a general framework and methodology for risk-based bridge and tunnel asset management. The research was carried out at Portland State University in collaboration with engineers and officials at Oregon Department of Transportation (ODOT) and Federal Highway Administration (FHWA). The pr ...
  • Influencing Travel Behavior via an OpenSource Platform Phase 2 Brief
    Influencing Travel Behavior via an Open-Source Platform Phase 2 [Brief]
    Valdes, Didier M. ;
    Figueroa-Medina, Alberto M
    2024-08-01 | PDF
    This project uses the open-source platform OneBusAway (OBA) developed at USF to explore strategies that can influence travel behavior to increase transit ridership. OneBusAway currently provides real-time transit information to users on a full range of devices and communication platforms, such as mobile apps, and serves more than 400,000 individual ...
  • ODOTs Snow and Ice Performance Evaluation Tools A Student Transportation Advancement Research STAR Project Fact Sheet
    ODOT‘s Snow and Ice Performance Evaluation Tools - A Student Transportation Advancement Research (STAR) Project [Fact Sheet]
    Masanja, Ntemi Methusela ;
    Mihayo, Meshack P
    2024-08-01 | PDF
    Severe winter weather poses a significant threat to road users, primarily due to slippery road surfaces, which considerably increase the risk of crashes and injuries. Additionally, such conditions can disrupt traffic flow on highways, causing speed reductions, decreased highway capacity, or even complete traffic lockdowns. Most Departments of Trans ...
  • Business Processes to Prioritize Traffic Signal Retiming and Assess the Impact of Retiming Activities
    Business Processes to Prioritize Traffic Signal Retiming and Assess the Impact of Retiming Activities
    Saldivar-Carranza, Enrique Daniel ;
    Platte, Tom
    2024-08-01 | PDF
    The Indiana Department of Transportation (INDOT) manages over 2,000 traffic signals in the State. It is unfeasible to identify systemwide improvement opportunities by evaluating the performance of thousands of traffic signals on monitoring dashboards. This report describes how a scalable technique based on connected vehicle (CV) trajectory data sys ...
  • Countermeasures for Maintaining Safe and Effective Public Transit Service in the PostCOVID19 Era
    Countermeasures for Maintaining Safe and Effective Public Transit Service in the Post-COVID-19 Era
    Qi, Yi ;
    Zhao, Qun
    2024-08-01 | PDF
    During the COVID pandemic, to prevent the spread of the virus, countries adopted various safety measures, including masking, social distancing, and vaccination. However, there is a lack of methods that can quantitively evaluate the effectiveness of these countermeasures. To fill the gap, this research first develops a model to quantitively evaluate ...
  • Energy and Emissions Impacts of Atlantas Reversible Express Toll Lanes and HighOccupancy Toll Lanes
    Energy and Emissions Impacts of Atlanta’s Reversible Express Toll Lanes and High-Occupancy Toll Lanes
    Lu, Hongyu ;
    Liu, Haobing
    2024-08-01 | PDF
    This report summarizes the impact on corridor-level energy use and emissions associated with the 2018 opening of the I-75 Northwest Corridor (NWC) and I-85 Express Lanes in Atlanta, GA. The research team tracked changes in vehicle throughput on the managed lane corridors (extracted from GDOT’s Georgia NaviGAtor machine vision system after comprehen ...
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