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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 101 - 120 of 35438 results
  • Improving Testing Requirements in Item 300 of TxDOT Standard Specifications Project Summary
    Improving Testing Requirements in Item 300 of TxDOT Standard Specifications [Project Summary]
    Bhasin, Amit ;
    Goehl, Darlene
    2025-08-31 | PDF
    The goal of this project was to identify and update the tests and specifications in Item 300 as needed to ensure that the test methods and specifications are relevant, not redundant, and up-to-date. A review of most materials in Item 300 was in the scope of this project; however, crack sealers, asphalt-rubber binders, and recycling agents were not ...
  • Evaluation of the Effect of Integral Waterproofing Agents Admixtures on Surface Resistivity Measurements Project Capsule
    Evaluation of the Effect of Integral Waterproofing Agents (Admixtures) on Surface Resistivity Measurements [Project Capsule]
    Hungria, Ricardo ;
    Rupnow, Tyson
    2025-08-27 | PDF
    The objectives of this study are to: 1. Determine the effect of incorporating waterproofing admixtures on the surface resistivity of concrete; and 2. Determine if the different admixture dosages can be optimized.
  • Youth Cruz Free: Fare Free Bus and Ridership Behavior among Santa Cruz County Teens [supporting dataset]
    Pike, Susan ;
    Affolter, Bailey
    2025-08-25 | ZIP
    Since the beginning of the twenty-first century, young people have become a considerable share of public transit users. However, younger representatives of this age group still face many barriers to access transit infrastructure and benefit from its service. This study examines a Youth Cruz Free program launched by the Santa Cruz METRO in March 202 ...
    Dataset
  • Illinois Highway Materials Sustainability Efforts 2024
    Illinois Highway Materials Sustainability Efforts 2024
    Senger, Kelly
    2025-08-25 | 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 ...
  • Streamlining Permitting and Mitigation Processes to Improve SCDOT Project Delivery
    Streamlining Permitting and Mitigation Processes to Improve SCDOT Project Delivery
    Huynh, Nathan N. ;
    Wang, Jing
    2025-08-08 | PDF
    The South Carolina Department of Transportation (SCDOT) identified three areas that have significant effect on its ability to deliver projects on time and on budget: (1) inconsistent permit application submittals among consultants that led to delay in approval by the U.S. Army Corp of Engineers, (2) inability to consistently identify “red flags” ea ...
  • Roundabout Construction Using Precast Concrete in Virginia
    Roundabout Construction Using Precast Concrete in Virginia
    Hossain, M. Shabbir ;
    Ozyildirim, H Celik
    2025-08-01 | PDF
    Roundabouts are a special type of intersection that ensures continuous vehicle movement while maintaining slow and safe speeds. Many state departments of transportation are converting existing intersections into roundabouts, but roundabout construction can create significant traffic closures and disruptions. Thus, accelerated construction can be ve ...
  • Use of Nuclear Gauge for Construction Quality Control of Unbound Base Course Containing Reclaimed Asphalt Pavement
    Use of Nuclear Gauge for Construction Quality Control of Unbound Base Course Containing Reclaimed Asphalt Pavement
    Hossain, M. Shabbir ;
    Hoppe, Edward J
    2025-08-01 | PDF
    A recent study determined that the Virginia Department of Transportation (VDOT) can use up to 30% reclaimed asphalt pavement (RAP) in a pavement base aggregate layer without adverse effects on pavement performance. However, an effective quality-control protocol to monitor construction is needed to implement the use of RAP in the base course. The st ...
  • Feasibility Assessment of Alternative Power Options for Roundabout Lighting in Georgia
    Feasibility Assessment of Alternative Power Options for Roundabout Lighting in Georgia
    Yang, Jidong J ;
    Bian, Jiachen
    2025-08-01 | PDF
    This report presents a comprehensive assessment of the technical and economic feasibility of deploying renewable energy - powered lighting systems at roundabouts across Georgia. Driven by the dual goals of enhancing nighttime traffic safety and advancing sustainable infrastructure, the study integrates high-resolution meteorological data, renewable ...
  • MechanisticBased Evaluation of Performance Thresholds for Balanced Mix Design Asphalt Surface Mixtures
    Mechanistic-Based Evaluation of Performance Thresholds for Balanced Mix Design Asphalt Surface Mixtures
    Habbouche, Jhony ;
    Boz, Ilker
    2025-08-01 | PDF
    As part of the Virginia Department of Transportation (VDOT) balanced mix design (BMD) implementation process, VDOT selected three quick, simple, and practical empirical tests to evaluate asphalt mixtures against different modes of distress for design and acceptance. These tests include the Cantabro test, with a mass loss limit of 7.5%; the indirect ...
  • Support for the ISTREET Implementing Solutions from Transportation Research and Evaluation of Emerging Technologies Testbed Summary
    Support for the I-STREET™ (Implementing Solutions from Transportation Research and Evaluation of Emerging Technologies) Testbed [Summary]
    Elefteriadou, Lily
    ORCID ICON IMG
    2025-08-01 | PDF
    Built on three pillars of economic development, innovation, and partnerships, I-STREET™ is a real-world transportation testbed developed to enhance transportation safety and mobility. The testbed allows researchers to develop, test, and evaluate emerging technologies in a live environment with real traffic, covering a variety of transportation mode ...
  • A Practical OvenAging Method for Evaluating LongTerm Cracking Performance of Asphalt Mixtures in Virginia
    A Practical Oven-Aging Method for Evaluating Long-Term Cracking Performance of Asphalt Mixtures in Virginia
    Boz, Ilker ;
    Hajj, Elie Y
    2025-08-01 | PDF
    The Virginia Department of Transportation (VDOT) has adopted the balanced mix design (BMD) framework to enhance the durability and service life of its dense-graded asphalt surface mixtures with A and D designations. VDOT’s BMD framework incorporates the indirect tensile cracking test to assess the cracking susceptibility of asphalt mixtures through ...
  • Investigation of ECommerce Enabled Freight Demand and Activities in Residential Areas
    Investigation of E-Commerce Enabled Freight Demand and Activities in Residential Areas
    Watts, Brian ;
    Jin, Xia
    2025-08-01 | PDF
    Online shopping has a large impact on Florida’s economy. It also has a significant effect on Florida’s freight systems.
  • Verification of Engineered Frameworks for Evaluating the Use of Recycling Agents in Surface Asphalt Mixtures
    Verification of Engineered Frameworks for Evaluating the Use of Recycling Agents in Surface Asphalt Mixtures
    Kuchiishi, Kazuo ;
    Habbouche, Jhony
    2025-08-01 | PDF
    The use of reclaimed asphalt pavement (RAP) in asphalt mixtures has been steadily increasing for years, nationally and internationally, given the economic and associated environmental benefits of using such material. However, using RAP in asphalt mixtures poses some challenges regarding durability and performance that are often associated with the ...
  • Evaluation of FiberModified Asphalt Mixtures Using BMD Tests
    Evaluation of Fiber-Modified Asphalt Mixtures Using BMD Tests
    Diefenderfer, Stacey D ;
    Nair, Harikrishnan
    2025-08-01 | PDF
    The Virginia Department of Transportation (VDOT) is interested in ways to improve asphalt mixture durability. These improvements can be accomplished through several approaches, including the use of performance-enhancing additives, such as fibers, and the incorporation of performance criteria in mixture design and acceptance. This project evaluated ...
  • Assessment of HighwayRailroad Grade Crossing Strategies Countermeasures and Technologies to Improve Traffic Safety and Mobility in Florida Summary
    Assessment of Highway-Railroad Grade Crossing Strategies, Countermeasures, and Technologies to Improve Traffic Safety and Mobility in Florida [Summary]
    Lin, Pei-Sung
    2025-08-01 | PDF
    Highway-rail grade crossings (HRGCs) are conflict areas for trains and road users, which present a significant safety concern in Florida. The HRGCs not only affect safety but also have a significant impact on traffic operations. FDOT explored several strategies to improve safety and mobility related to railroad grade crossings, including signage, p ...
  • Performance Evaluation of Safe Mobility for Life Coalitions Outreach Activities to Benefit Aging Road Users Summary
    Performance Evaluation of Safe Mobility for Life Coalition’s Outreach Activities to Benefit Aging Road Users [Summary]
    Alluri, Priyanka ;
    Mdimi, Odilo
    2025-08-01 | PDF
    As Florida’s aging population increases, the demand to ensure safe mobility for older adults also increases, especially since aging road users are vulnerable to serious and fatal crashes. Over 20% of Florida residents are aged 65 or older, and this number is projected to increase by 2045. Age is linked with a decline in vision, cognition, and react ...
  • Micromobility Analytics in Florida Usage Patterns Public Transit Synergies and Crash Insights Summary
    Micromobility Analytics in Florida: Usage Patterns, Public Transit Synergies, and Crash Insights [Summary]
    Peng, Zhong-Ren
    2025-08-01 | PDF
    Micromobility has become increasingly popular in cities across Florida and the nation, offering a convenient, flexible, and accessible alternative for short-distance travel, particularly for first-and last-mile transportation. However, most areas of Florida and even the nation currently lack a framework and established practices for micromobility a ...
  • Measuring Access to Improve Public Health Phase II
    Measuring Access to Improve Public Health – Phase II
    Gonzales, Eric J. ;
    Christofa, Eleni
    2025-08-01 | PDF
    This study advances transportation access metrics that support public health planning across Massachusetts. Building on Phase I, which focused on food access, Phase II expands the scope to include healthcare, higher education, and parks. The research improves methods to account for walkability, bikeability, and the role of microtransit alongside fi ...
  • Guidelines for Using Lightweight Fills in Transportation Infrastructure Applications
    Guidelines for Using Lightweight Fills in Transportation Infrastructure Applications
    Morsy, Amr M ;
    Zornberg, Jorge G.
    2025-08-01 | PDF
    This research investigated the use of lightweight fills as an alternative to conventional fills in transportation infrastructure, particularly for fill applications on soft, compressible soils. The study synthesized current practices through a literature review, survey of state DOTs, evaluation of case studies, and material costs. Through this rese ...
  • A Feasibility Study of Road CulvertBridge Deck Deicing Using Geothermal Energy
    A Feasibility Study of Road Culvert/Bridge Deck Deicing Using Geothermal Energy
    Khosravi, Mohammad ;
    Turner, Ethan
    2025-08-01 | PDF
    Montana's severe winters challenge bridge infrastructure with snow, ice, and concrete deterioration. Traditional deicing methods are often insufficient, harmful, and costly. This research explored using shallow geothermal energy for sustainable bridge deck deicing. Through lab tests, simulations, and machine learning, the system showed it could kee ...
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