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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 35412 results
  • 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 ...
  • Synthesis of Carbon Capture and Repurposing ByProducts
    Synthesis of Carbon Capture and Repurposing By-Products
    Rausch, Christopher ;
    Ferron, Raissa
    2025-08-01 | PDF
    Project 0-7231 evaluated the feasibility and readiness of Carbon Capture, Utilization, and Storage (CCUS) technologies for integration into Texas transportation infrastructure. The study provided a comprehensive review of CCUS methods, assessed material-based applications such as CO₂-injected concrete and bio-based alternatives, and developed a lif ...
  • Traffic Signal Operations Supporting All Users
    Traffic Signal Operations Supporting All Users
    Reynolds, Isabelle ;
    Qi, Yue
    2025-08-01 | PDF
    Common complete street traffic signal timing strategies include leading pedestrian intervals, exclusive bicycle and pedestrian phasing, transit and bicycle queue jumps, and more. These countermeasures are utilized to curb pedestrian and bicycle crashes with vehicles; however, they often come at the expense of decreased travel efficiency. Safety and ...
  • North Dakota Statewide Traffic Safety Survey 2025 Traffic Safety Performance Measures for State and Federal Agencies
    North Dakota Statewide Traffic Safety Survey, 2025: Traffic Safety Performance Measures for State and Federal Agencies
    Vachal, Kimberly ;
    Kubas, Andrew
    2025-08-01 | PDF
    The statewide driver traffic safety survey provides baseline and longitudinal metrics for the Highway Safety Division and others to use in understanding perceptions and self-reported behaviors related to focus issues. A core set of questions addresses nationally agreed upon priorities, including seat belts, impaired driving, and speeding. In additi ...
  • Use of Innovative Recycling Agents for Improving the Sustainability and Durability of Asphalt Pavement
    Use of Innovative Recycling Agents for Improving the Sustainability and Durability of Asphalt Pavement
    Mohammad, Louay N. ;
    Elnaml, Ibrahim
    2025-08-01 | PDF
    The use of reclaimed asphalt pavement (RAP) as a partial replacement for virgin aggregates and asphalt binders has received considerable attention in recent years due to its economic and environmental benefits. These benefits include a potential reduction in asphalt mixture cost and the promotion of sustainability. However, many state Departments o ...
  • Generation2 Fragility Models for California Highway Bridges
    Generation-2 Fragility Models for California Highway Bridges
    Zheng, Qiu ;
    Yang, Walter C.S.
    2025-08-01 | PDF
    This report provides a summary of the framework and methodology underlying the second-generation seismic fragility work (g2F) using selected concrete box-girder bridges in California. It outlines the key components and processes involved in the g2F project designed to improve earthquake risk assessment and mitigation strategies. The report first in ...
  • Traffic Control Device Analysis Testing and Evaluation Program FY 2024 Activities
    Traffic Control Device Analysis, Testing, and Evaluation Program: FY 2024 Activities
    Finley, Melisa D. ;
    Brewer, Marcus A.
    2025-08-01 | PDF
    Traffic control devices are a primary means of communicating highway information to road users and play a key role in highway automation. The design, application, and maintenance of traffic control devices are under constant transformation as new technologies, methodologies, and policies are introduced. In addition, vehicle technologies and the roa ...
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