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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 1321 - 1340 of 36873 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 ...
  • Improving Traffic Signal System Planning Design and Management With BigDataEnhanced ATSPM System Project Summary Report
    Improving Traffic Signal System Planning, Design, and Management With Big-Data-Enhanced ATSPM System [Project Summary Report]
    Li, Taylor ;
    Mattingly, Stephen
    2024-08-31 | PDF
    Automated Traffic Signal Performance Measures or ATSPM represent a state-of-the-art traffic signal management solution. After over 20 years of collaboration among federal agencies, state agencies, academia, and industry, the ATSPM system is increasingly being accepted and adopted by agencies. While the ATSPM deployment is scaling up, new challenges ...
  • 07139 Determination of Pavement Surface Type
    0-7139: Determination of Pavement Surface Type
    Prozzi, Jorge A. ;
    Sabillon, Christian
    2024-08-31 | PDF
    This study evaluated and developed machine learning models for pavement surface classification to enhance accuracy and reliability using advanced computational techniques. Initially, a detailed literature review on pavement texture and measurement methods provided a foundation for developing a prototype system. This system, integrating laser scanne ...
  • Develop Efficient Prediction Model of Highway Friction on an Annual Basis on Texas Network Project Summary Report
    Develop Efficient Prediction Model of Highway Friction on an Annual Basis on Texas Network [Project Summary Report]
    Prozzi, Jorge ;
    Sabillon-Orellana, Christian
    2024-08-31 | PDF
    Measuring network skid resistance annually is essential for the safety of the road users and the public. However, current skid resistance measurement equipment is inefficient due to the large volumes of water required, limiting TxDOT to assessing at most one-third of the state-maintained network on an annual basis. While past efforts to estimate sk ...
  • 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 ...
  • Investigation of Ferry Wait Time Technology Implementation
    Investigation of Ferry Wait Time Technology Implementation
    Coble, Daniel ;
    Yang, Guangchaun
    2024-08-28 | PDF
    The North Carolina Department of Transportation (NCDOT) Ferry Division operates vessels on seven routes along the eastern coast of North Carolina, catering to a variety of users, from tourists to daily commuters. Just like traffic signals on roadways, queuing and waiting are inherent at ferry terminals, and understanding wait times and queue length ...
  • 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 ...
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