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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 441 - 460 of 35440 results
  • Optimized Aggregate Gradations for Concrete Mixture Designs
    Optimized Aggregate Gradations for Concrete Mixture Designs
    Saykat, Sazzadul ;
    Napper, Caleb
    2025-01-01 | PDF
    Tennessee does not currently have procedures or specification requirements that fully support the use of optimized gradations in concrete mixtures. This research project focused on optimizing aggregate gradation for concrete mixtures used by the Tennessee Department of Transportation (TDOT), aiming to improve concrete durability, economy, and susta ...
  • Connected Autonomous Shuttle Supporting Innovation CASSI Program Development
    Connected Autonomous Shuttle Supporting Innovation (CASSI) Program Development
    Searcy, Sarah ;
    Good,Amanda R.
    2025-01-01 | PDF
    Led by the Integrated Mobility Division (IMD), the North Carolina Department of Transportation (NCDOT)'s Connected Autonomous Shuttle Supporting Innovation (CASSI) is the state's flagship automated shuttle pilot program. CASSI introduces the public to automated vehicle technology through free shared rides and showcases how the technology works for ...
  • Development of a Web Portal for the Management Visualization and Analysis of Collected Mobile LiDAR Data Along Indianas Transportation Corridors
    Development of a Web Portal for the Management, Visualization, and Analysis of Collected Mobile LiDAR Data Along Indiana’s Transportation Corridors
    Shin, Sang-Yeop ;
    Kim, Hanjin
    2025-01-01 | PDF
    Efficient road management requires collecting and analyzing various geospatial data related to transportation corridors. Mobile Mapping Systems (MMS), integrated with GNSS/INS units, RGB cameras, and LiDAR technology, enable the collection of geo-tagged imagery and 3D point cloud data across roadway networks. Acquired data helps in the inventory an ...
  • A New Approach to Accelerated Fabrication of Steel Bridges Design Optimization and Demonstration Summary
    A New Approach to Accelerated Fabrication of Steel Bridges: Design, Optimization, and Demonstration [Summary]
    Thrall, Ashley P
    2025-01-01 | PDF
    This research developed and demonstrated a new approach to the accelerated fabrication of resilient steel bridges—built-up press-brake formed tub girders (PBTGs). Built-up PBTGs are comprised of webs that are cold bent via a press brake and bolted to separate, flat bottom and top flanges. This investigation included (1) designing and building two d ...
  • Synthesis Study Review of Durability and Performance of the Latest EpoxyCoated Rebar
    Synthesis Study: Review of Durability and Performance of the Latest Epoxy-Coated Rebar
    Ramirez, Julio A. ;
    Jimenez, Luis A Quesada
    2025-01-01 | PDF
    The use of de-icing salts on roads during the winter months has caused corrosion damage to bridge reinforcements, which has increased maintenance costs. The corrosion protection system most widely used by various State Departments of Transportation is a combination of quality concrete, adequate cover, and fusion bonded epoxy-coated reinforcing bars ...
  • Synthesis Study Review of Durability and Performance of the Latest EpoxyCoated Rebar Summary
    Synthesis Study: Review of Durability and Performance of the Latest Epoxy-Coated Rebar [Summary]
    Ramirez, Julio A.
    2025-01-01 | PDF
    The use of de-icing salts on roads during the winter months has caused corrosion damage to bridge reinforcements, which has increased maintenance costs. The corrosion protection system most widely used by various State Departments of Transportation is a combination of quality concrete, adequate cover, and fusion bonded epoxy-coated reinforcing bars ...
  • Beneficial Use of Iowa Waste Ashes in Concrete through Carbon Sequestration Tech Transfer Summary
    Beneficial Use of Iowa Waste Ashes in Concrete through Carbon Sequestration [Tech Transfer Summary]
    Wang, Kejin
    ORCID ICON IMG
    2025-01-01 | PDF
    Certain types of waste ashes can increase the decarbonation of cement and concrete, providing a use for the waste ashes and promoting sustainability.
  • Assessment of the Mobility Energy Productivity MEP Metric for Transportation Applications in Florida Summary
    Assessment of the Mobility Energy Productivity (MEP) Metric for Transportation Applications in Florida [Summary]
    Matthews, Gabrielle ;
    Jin, Xia
    2025-01-01 | PDF
    The objective of this project was to evaluate the effectiveness of the Mobility Energy Productivity (MEP) metric—a qualitative framework that assesses the quality of mobility in transportation systems when considering accessibility, energy consumption, and productivity—as a tool to provide additional performance measures to enhance decision-making ...
  • Environment for Testing and Assessing Infrastructure Support of Connected Vehicle and Cooperative Highway Automation Summary
    Environment for Testing and Assessing Infrastructure Support of Connected Vehicle and Cooperative Highway Automation [Summary]
    Ponnaluri, Raj ;
    Hadi, Mohammed
    2025-01-01 | PDF
    The primary goal of this project was to provide recommendations on incorporating CDA into FDOT’s Transportation System Management and Operations (TSM&O). Specific objectives included developing a Concept of Operations (ConOps) for incorporating CDA features in traffic management; formulating methods to test and evaluate infrastructure support for C ...
  • Proposed Design of Internally Redundant Steel Box Straddle Caps
    Proposed Design of Internally Redundant Steel Box Straddle Caps
    Zecchin, Esteban ;
    Williams, Emma
    2025-01-01 | PDF
    Steel box straddle caps are classified as Fracture Critical Members, requiring stringent design, fabrication, and in-service inspections to comply with the provisions of the Fracture Control Plan. Providing internal redundancy to steel box straddle caps to remove the Fracture Critical inspection requirements is highly desirable. The research conduc ...
  • Evaluation of Recycled Plastic Modified Asphalt Mixtures and Pavements Phase I A Case Study in Virginia
    Evaluation of Recycled Plastic Modified Asphalt Mixtures and Pavements: Phase I - A Case Study in Virginia
    Habbouche, Jhony ;
    Lloyd, Lewis N.
    2025-01-01 | PDF
    The purpose of this study was to assess recycled plastic-modified (RPM) asphalt mixtures field trials constructed in Virginia. This study documented and evaluated the constructability and laboratory performance of two plant-produced RPM mixtures compared with the Virginia Department of Transportation (VDOT) typical D and E surface mixtures as refer ...
    Supporting Files
  • Beneficial Use of Iowa Waste Ashes in Concrete through Carbon Sequestration
    Beneficial Use of Iowa Waste Ashes in Concrete through Carbon Sequestration
    Wang, Kejin ;
    Lee, Yunsu
    2025-01-01 | PDF
    A significant amount of waste ash in the United States does not meet the necessary specifications for construction and other uses, and power plants are searching for a way to dispose of surplus waste ashes. To address this issue, this research aimed to treat waste ashes using CO2 injection in order to modify their properties and enable their benefi ...
  • Development of SemiIntegral Bridge Abutment Details for Texas Conditions
    Development of Semi-Integral Bridge Abutment Details for Texas Conditions
    Zornberg, Jorge G. ;
    Mofarraj, Behdad
    2025-01-01 | PDF
    Semi-integral bridges constitute a promising alternative to conventional TxDOT bridges because they eliminate the need for deck expansion joints, which may significantly reduce bridge maintenance costs and potentially result in significant savings over the bridge service life. Adopting semi-integral bridges is particularly relevant to Districts wit ...
  • Geosyntheticstabilized Roadways for Base Course Reduction
    Geosynthetic-stabilized Roadways for Base Course Reduction
    Zornberg, Jorge G. ;
    Sankaranarayanan, Subramanian
    2025-01-01 | PDF
    This project includes the instrumentation and post-construction monitoring of pavement test sections that incorporate geogrids for base stabilization along IH10 frontage roads east of San Antonio. Specifically, and as part of a full-depth frontage road rehabilitation, the test sections were constructed with an unbound aggregate base layer stabilize ...
  • Texas Electric Vehicle Charging Infrastructure Readiness Plan
    Texas Electric Vehicle Charging Infrastructure Readiness Plan
    Kraus, Edgar ;
    Kuzio, Jacqueline
    2025-01-01 | PDF
    With the growing adoption of electric vehicles (EVs) in the United States and by Texans, Texas needs adequate and comprehensive coverage of EV charging infrastructure. Although currently comprising slightly more than 1 percent of all registered vehicles in Texas, many projections forecast that EVs could comprise up to 55 percent of all vehicles by ...
  • LongTerm Statewide EV Infrastructure Plan
    Long-Term Statewide EV Infrastructure Plan
    Kraus, Edgar ;
    Kuzio, Jacqueline
    2025-01-01 | PDF
    This document is Product 0-7169-P3, Long-Term Statewide EV Infrastructure Strategic Plan, which the research team developed as part of Task 6 of Texas Department of Transportation (TxDOT) Project 0-7169, Post-NEVI Electric Vehicle Infrastructure Research (Freight, Fleet, and Multifamily Housing). The purpose of the long-term strategic plan is to gu ...
  • Evaluating Candidate Projects for Seal Coat Stability
    Evaluating Candidate Projects for Seal Coat Stability
    Goehl, Darlene ;
    Nyamuhokya, Tito
    2025-01-01 | PDF
    With investments in seal coats exceeding $250 million annually, it is critical to apply the right treatment to the right road at the right time. Projects are typically selected based on the time since the last seal coat (an average of 7 years) with little to no testing performed to ensure that the section is a good candidate for a seal coat. The ob ...
  • Updated Test Procedures
    Updated Test Procedures
    Arambula-Mercado, Edith ;
    Sebesta, Stephen
    2025-01-01 | PDF
    Test procedure to develop a laboratory mixture design for the full depth reclamation (FDR) of roadways using emulsified asphalt (emulsion). This procedure will determine a moisture-density curve, optimum emulsion content, and when necessary, a target additive content based on the indirect tensile (IDT) strength of unconditioned and moisture conditi ...
  • Evaluation of Mix Design Variables for Full Depth Reclamation FDR with Asphalt
    Evaluation of Mix Design Variables for Full Depth Reclamation (FDR) with Asphalt
    Arambula-Mercado, Edith ;
    Sebesta, Stephen
    2025-01-01 | PDF
    This study on full depth reclamation (FDR) with asphalt binders was aimed at updating FDR mix design procedures for the Texas Department of Transportation’s (TxDOT’s) 2024 Standard Specifications. The study included a literature review, a laboratory factors study, an interlaboratory study, and field evaluations. The literature review examined the u ...
  • Use of XRay Fluorescence XRF to Determine Tire Rubber Content in Asphalt Binders
    Use of X-Ray Fluorescence (XRF) to Determine Tire Rubber Content in Asphalt Binders
    Bhasin, Amit ;
    Filonzi, Angelo
    2025-01-01 | PDF
    This work involved making a portable X-Ray Fluorescence Spectroscopy device available to district personnel and training them to use the device on a routine basis to analyze tire rubber-modified asphalt binder for tire rubber content. The Performing Agency worked with the Receiving Agency and producers from around the state to develop calibration s ...
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