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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 121 - 140 of 36336 results
  • Development of Adjustment Factors and Load Ratings via Statistical Analyses of the National Bridge Inventory Database Technical Summary
    Development of Adjustment Factors and Load Ratings via Statistical Analyses of the National Bridge Inventory Database [Technical Summary]
    McVey, Isaac ;
    Husic, Admin
    2026-01-01 | PDF
    The primary objective of this study was to develop and evaluate a statistical model using the National Bridge Inventory (NBI) database to establish baseline load ratings for bridges in Kansas. A linear regression model was used to identify key variables, such as age and bridge condition, that correlate with recorded inventory and operating load rat ...
  • Computational Fluid Dynamics Investigation of High Mast Illumination Poles Influence of Light Fixtures
    Computational Fluid Dynamics Investigation of High Mast Illumination Poles: Influence of Light Fixtures
    Junge, Briceson ;
    Bennett, Caroline
    2026-01-01 | PDF
    High Mast Illumination Poles (HMIPs) are lighting towers that are taller than 55 ft (16.8 m) and are typically located along highways and rest stops. In March 2019, a wind event, referred to as a “bomb cyclone,” caused several HMIPs in Kansas to excite and experience large-amplitude deflections on the order of several feet called “lock-in” behavior ...
  • Effectiveness of Automated Speed Enforcement in School Zones and Guidance for Continuous Usage in Georgia
    Effectiveness of Automated Speed Enforcement in School Zones and Guidance for Continuous Usage in Georgia
    Dissanayake, Sunanda ;
    Bhavsar, Parth
    2026-01-01 | PDF
    One of the growing concerns for transportation agencies is speed management in school zones, as it is vital to children's safety. Automated Speed Enforcement (ASE) is one of the measures to address speed management concerns. As of January 2024, approximately 286 schools across Georgia were equipped with ASE cameras, aiming to improve traffic safety ...
  • Investigate the Impact of Rumble Strip on Motorcyclists
    Investigate the Impact of Rumble Strip on Motorcyclists
    Tsai, Yichang (James) ;
    Cabe, Reid
    2026-01-01 | PDF
    This research project evaluates how rumble strip design and placement affect motorcycle safety and comfort, with the goal of developing recommendations for the Georgia Department of Transportation (GDOT) to improve roadway design practices. Rumble strips are a proven countermeasure for roadway departure crashes; however, their vibration and geometr ...
  • Artificial Intelligence and Its Role and Use Within State DOTs
    Artificial Intelligence and Its Role and Use Within State DOTs
    Egge, Mark ;
    Tate, Syndney
    2026-01-01 | PDF
    Artificial Intelligence (AI) is increasingly shaping the way state Departments of Transportation (DOTs) approach both research and daily operations. This powerful technology creates new opportunities for improving efficiency, supporting decision-making, and streamlining agency workflows, but it also presents new challenges, including concerns about ...
  • Traffic Data for Network Level Pavement Structural Assessment and Performance Grade Asphalt Selection
    Traffic Data for Network Level Pavement Structural Assessment and Performance Grade Asphalt Selection
    Zhong, Jingtao ;
    Gu, Yangsong
    2026-01-01 | PDF
    Truck traffic is an important input for pavement design and analysis. Proper characterization of traffic patterns contributes to the design of reliable and cost-effective pavement structures. Axle load spectra obtained from the Long-Term Pavement Performance (LTPP) database, together with local Annual Average Daily Traffic (AADT) data from Tennesse ...
  • 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 ...
  • Creation of an Allweather Road Impact Prediction System ARIPS
    Creation of an All-weather Road Impact Prediction System (ARIPS)
    Reeves, Heather D. ;
    Rosenow, Andrew A.
    2026-01-01 | PDF
    This project is designed to examine the utility of using the database of flood-induced road closures collected by MoDOT to develop an Artificial Intelligence/Machine Learning (AI/ML) model. This was accomplished by assembling a database of predictors. These predictors include quantitative precipitation estimates, hydrologic model output, and a seri ...
  • Creation of an Allweather Road Impact Prediction System ARIPS Summary
    Creation of an All-weather Road Impact Prediction System (ARIPS) [Summary]
    Reeves, Heather D. ;
    Rosenow, Andrew A.
    2026-01-01 | PDF
    This project is designed to examine the utility of using the database of flood-induced road closures collected by MoDOT to develop an Artificial Intelligence/Machine Learning (AI/ML) model. This was accomplished by assembling a database of predictors. These predictors include quantitative precipitation estimates, hydrologic model output, and a seri ...
  • 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 ...
  • 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.
  • 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 ...
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