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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 321 - 340 of 36841 results
  • Low and Intermediate Temperature Evaluation of Asphalt Binders Through Dynamic Shear Rheometer Technical Summary
    Low and Intermediate Temperature Evaluation of Asphalt Binders Through Dynamic Shear Rheometer [Technical Summary]
    Salari, Saman ;
    Cooper, Samuel B., III
    2026-01-01 | PDF
    The primary objective of this research was to evaluate the effectiveness of newly proposed methods (iCCL, UTFO, and WRI) for the low-temperature performance grading of asphalt binders by comparing them against the conventional Bending Beam Rheometer (BBR) test. Ultimately, this study aimed to determine whether these alternative methods can provide ...
  • Balanced Mix Design a 1Year Reality Check on Quality Control Testing and State DOT Adoption Technical Summary
    Balanced Mix Design- a 1-Year Reality Check on Quality Control Testing and State DOT Adoption [Technical Summary]
    Huang, Baoshan ;
    Huang, Kai
    2026-01-01 | PDF
    The objectives of this study were to synthesize BMD implementation and related research in the southeastern U.S. region on essential topics within the BMD framework through a comprehensive review of ongoing and completed studies on BMD procedures. The research team also conducted a two-round survey of current BMD practices to document the implement ...
  • Virginias 2024 Implementation of Balanced Mix Design
    Virginia’s 2024 Implementation of Balanced Mix Design
    Diefenderfer, Stacey D. ;
    Smith, Bryan C.
    2026-01-01 | PDF
    The Virginia Department of Transportation (VDOT) implemented balanced mix design (BMD) performance testing for asphalt mixture design and production in the 2024 paving season. The BMD approach seeks to achieve asphalt mixtures that have properties to resist both cracking and rutting distresses and to increase durability. This implementation of BMD ...
  • Develop a RealTime Decision Support Tool for Urban Roadway Safety Improvements
    Develop a Real-Time Decision Support Tool for Urban Roadway Safety Improvements
    Das, Subasish ;
    Liu, Jinli
    2026-01-01 | PDF
    Speed-related crashes remain a critical concern for Texas, identified as one of the seven key emphasis areas in the Texas Strategic Highway Safety Plan (SHSP) for 2018–2022. Traditional crash risk models often overlook essential real-time factors such as operating speed, traffic variability, and weather, limiting their effectiveness. To address thi ...
  • The Use of Recycled Plastic in Asphalt Pavements Feasibility Study
    The Use of Recycled Plastic in Asphalt Pavements: Feasibility Study
    Bueno, Isabella M. ;
    Teixeira, Jamilla E. S. L.
    2026-01-01 | PDF
    The plastics industry has been actively exploring new end-market opportunities for the more than 35 million tons of waste plastics generated annually. The use of recycled WP in asphalt presents an opportunity to improve pavement performance while reducing the growing amount of WP being landfilled or released into the environment. However, the use o ...
  • Evaluation of Critical Shear Strength of Soils in Nebraska Based on Revised CPT
    Evaluation of Critical Shear Strength of Soils in Nebraska Based on Revised CPT
    Song, Chung R. ;
    Al-Nimri, Bashar
    2026-01-01 | PDF
    This study evaluated the “Fully Softened Shear Strength (FSSS)” of soils in Nebraska based on a revised Cone Penetration Test(CPT) method. FSSS is a unique strength condition that soils show substantially reduced strength during rainy seasons, eventually causing failure of slopes and other structures. The revised CPT was adapted to inject water at ...
  • Development and Evaluation of Crashworthy Approach Guardrail Transition with Increased Span Length Between Concrete Bridge Rail and First Transition Post Phase I
    Development and Evaluation of Crashworthy Approach Guardrail Transition with Increased Span Length Between Concrete Bridge Rail and First Transition Post – Phase I
    Yosef, Tewodros Y. ;
    Alomari, Qusai A.
    2026-01-01 | PDF
    This study developed and evaluated a 34-in.-tall Nebraska Department of Transportation (NDOT) thrie-beam approach guardrail transition (AGT) with an increased span between the concrete buttress end and the first transition post. The objective was to accommodate a wide range of common obstructions near bridge ends, including abutments, wing walls, d ...
  • Emergency Management Strategies for Electric Vehicles
    Emergency Management Strategies for Electric Vehicles
    Goodall, Noah J.
    2026-01-01 | PDF
    Electric vehicle fires present unique challenges for roadway incident management due to lithium-ion battery thermal runaway characteristics that can result in extended suppression durations, toxic emissions, and reignition risks. This study assessed the prevalence and operational impacts of electric vehicle fires through analysis of vehicle fire in ...
  • Partnering With Transportation Network Companies to Serve LowDensity Communities
    Partnering With Transportation Network Companies to Serve Low-Density Communities
    Darling, Wesley ;
    Cassidy, Michael J.
    2026-01-01 | PDF
    This study addresses the persistent challenge of delivering cost-effective, high-quality on-demand transit in low-density communities. Traditional microtransit services often struggle in such areas due to high fixed costs and limited opportunities to consolidate trips, while community partnerships with transportation network companies (TNCs) like U ...
  • Development of Adjustment Factors and Load Ratings via Statistical Analyses of the National Bridge Inventory Database
    Development of Adjustment Factors and Load Ratings via Statistical Analyses of the National Bridge Inventory Database
    McVey, Isaac ;
    Husic, Admin
    2026-01-01 | PDF
    This study developed a new approach to establish baseline load ratings for bridges in Kansas without plans using data from the National Bridge Inventory (NBI). The approach is comprised of linear regression models to estimate load ratings for bridges with a condition rating of 8 or higher and adjustment factors to lower the estimated load rating to ...
  • MoDOT Work Zone Speed Study
    MoDOT Work Zone Speed Study
    Brown, Henry ;
    Edara, Praveen
    2026-01-01 | PDF
    Management of work zone speeds and ensuring driver compliance with work zone speed limits play an important role in reducing the number and severity of work zone crashes. The objective of this research study is to assess speeds driven by motorists in Missouri freeway work zones, including average speeds, 85th percentile speeds, maximum speeds, and ...
  • MoDOT Work Zone Speed Study Summary
    MoDOT Work Zone Speed Study [Summary]
    Brown, Henry ;
    Edara, Praveen
    2026-01-01 | PDF
    Management of work zone speeds and ensuring driver compliance with work zone speed limits play an important role in reducing the number and severity of work zone crashes. The objective of this research study is to assess speeds driven by motorists in Missouri freeway work zones, including average speeds, 85th percentile speeds, maximum speeds, and ...
  • Enhancing Accessibility for Individuals With Limited Mobility Leveraging AI and Cycling Data for an Inclusive Active Transportation Network
    Enhancing Accessibility for Individuals With Limited Mobility: Leveraging AI and Cycling Data for an Inclusive Active Transportation Network
    Thapa, Madhu Mausam ;
    Luitel, Sanjay
    2026-01-01 | PDF
    This study introduces a low-cost, scalable framework for monitoring and assessing the condition of paved trail infrastructure to enhance accessibility for all users, particularly those with limited mobility. The research utilizes a custom-built "Data Bike" with GPS and accelerometers embedded with high-resolution cameras to collect multimodal data ...
  • Assessment of Truck Parking Demand and Safety During Normal and Severe Weather Conditions in Nebraska
    Assessment of Truck Parking Demand and Safety During Normal and Severe Weather Conditions in Nebraska
    Huynh, Nathan ;
    Zhao, Li
    2026-01-01 | PDF
    This project examined truck parking capacity, demand, and utilization patterns along I-80 in Nebraska. The objectives were to (1) document the capacity of public and private truck parking facilities along I-80, (2) analyze spatial and temporal trends in parking demand, (3) develop models to predict occupancy at parking facilities, (4) identify clus ...
  • Evaluation of Different Curb Extension Treatments for Pedestrian Comfort and Safety at Intersections
    Evaluation of Different Curb Extension Treatments for Pedestrian Comfort and Safety at Intersections
    Kumfer, Wesley ;
    O’Brien, Sarah Worth
    2026-01-01 | PDF
    The purpose of this study was to examine the effect of different kinds of curb extensions in Washington, D.C. on both driver yielding behavior and on pedestrian crossing satisfaction. To explore these questions, we used a mixed methods approach of surveying pedestrians crossing the roads from 47 curb extensions and video data recording of driver yi ...
  • Report 26R38 Business Impacts of Access Changes Research Brief
    Report 26-R38: Business Impacts of Access Changes [Research Brief]
    Gillespie, James S. ;
    Batman, Isaiah E.
    2026-01-01 | PDF
    This study sought to determine whether a change in motor vehicle access to a commercial property had a measurable impact on year-to-year changes in the number of customers visiting or in the volume of customer transactions, while controlling for other influences.
  • Strategies for Improving the Cracking Resistance of Alabama Mixes
    Strategies for Improving the Cracking Resistance of Alabama Mixes
    Sadeghi, Mohammad ;
    Hartzog, Zane
    2026-01-01 | PDF
    This project evaluated practical strategies for improving the cracking resistance of asphalt surface mixtures in Alabama while ensuring adequate resistance to rutting. The study focused on Superpave surface mixtures commonly used by the Alabama Department of Transportation (ALDOT) and examined three types of adjustments: binder content and grade, a ...
  • What Makes a Good Transportation Demand Management Calculator Research Brief
    What Makes a Good Transportation Demand Management Calculator? [Research Brief]
    Scheib, Walter ;
    Kilpatrick, Ian
    2026-01-01 | PDF
    This study identified seventeen TDM calculators in use around the country. These calculators were evaluated on their interface, format, directions, methodology, validity, and versatility. The study then conducted two rounds of interviews. The first round was with some of the jurisdictions currently using these calculators to understand what went in ...
  • WebBased Tool to Advance Geotechnical Data Interchange and ReliabilityBased Site Characterization Technical Summary
    Web-Based Tool to Advance Geotechnical Data Interchange and Reliability-Based Site Characterization [Technical Summary]
    Gautreau, Gavin P.
    2026-01-01 | PDF
    This project expanded upon a prototype interface initially developed for large, data-rich projects and produced a functional tool that DOTD can use on any digital project within the Department. The new tool, named GDX-plorer, builds upon DOTD's ongoing efforts to modernize geotechnical data management and support the adoption of advanced techniques ...
  • Haul Road and Detour Maintenance
    Haul Road and Detour Maintenance
    Marasteanu, Mihai ;
    Levin, Michael W.
    2026-01-01 | PDF
    Highway construction projects frequently require detours and haul roads that divert traffic, including heavy trucks, onto local roads not originally designed for such loads. These temporary routes can accelerate pavement deterioration, reduce service life, and impose significant maintenance costs on local agencies. Current compensation practices, s ...
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