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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 781 - 800 of 35448 results
  • Moving Beyond the Colors The Full LifeCycle Emissions of Hydrogen Production Pathways for California
    Moving Beyond the Colors: The Full Life-Cycle Emissions of Hydrogen Production Pathways for California
    Lipman, Timothy ;
    Busch, Pablo
    2024-08-01 | PDF
    There is growing interest in the use of hydrogen as a transportation fuel but the environmental benefits of using hydrogen depend critically on how it is produced and distributed. Leading alternatives to using fossil natural gas to make hydrogen through the conventional method of steam methane reforming include using electrolyzers to split water in ...
  • Resources and Tools to Reduce Multiple Risky Driving Behaviors
    Resources and Tools to Reduce Multiple Risky Driving Behaviors
    Finley, Kari ;
    Hanson, Bridget
    2024-08-01 | PDF
    There is growing recognition that drivers involved in fatal crashes are often engaged in multiple risky behaviors – not wearing a seat belt, speeding, and driving impaired (FARS, 2020). Research has established associations between impulsivity and multiple risky driving behaviors (Bıçaksız & Özkan, 2016b). While the association between impulsivity ...
    Supporting Files
  • Evaluate the Safety Effects of Adopting a StopasYield Law for Cyclists in California
    Evaluate the Safety Effects of Adopting a Stop-as-Yield Law for Cyclists in California
    Mahdinia, Iman ;
    Griswold, Julia B
    2024-08-01 | PDF
    The escalating number of injuries and fatalities among cyclists is a pressing safety concern. In the United States, communities are actively seeking strategies to boost cyclist safety, with some states implementing bike-specific policies, such as stop-as-yield laws, to support cyclists. Stop-as-yield laws allow cyclists to treat stop signs as yield ...
  • Constructing HighDensity Longitudinal Joints To Improve Pavement Longevity
    Constructing High-Density Longitudinal Joints To Improve Pavement Longevity
    Chitnis, Vipul ;
    Sukhija, Mayank
    2024-08-01 | PDF
    In Oregon, asphalt cracking is the primary distress mode, necessitating costly rehabilitation and maintenance. Cracking failures around longitudinal joints (especially on roadway sections with centerline rumble strips) have been an important issue in Oregon, affecting the overall long-term performance of the Oregon roadway network. Longitudinal joi ...
  • Recommendations for Extension in Service Life of ASRAffected Concrete
    Recommendations for Extension in Service Life of ASR-Affected Concrete
    Kurtis, Kimberly E ;
    Stewart, Lauren K
    2024-08-01 | PDF
    Alkali–silica reaction (ASR), a chemical reaction occurring in concrete between reactive siliceous minerals in some aggregates and alkalis in the concrete pore solution, can produce an expansive gel that, in the presence of sufficient moisture, can lead to expansion and cracking. This not only decreases mechanical properties but also increases perm ...
  • Identifying Mental Frameworks Underlying Driver Behavior in Urban Contexts Summary
    Identifying Mental Frameworks Underlying Driver Behavior in Urban Contexts [Summary]
    Carver, DeWayne ;
    Eluru, Naveen
    2024-08-01 | PDF
    The objective of this research was to explore the social and psychological principles that uniquely apply to face-to-face urban transportation systems and apply those to the design of the roadway.
  • Enhanced Capabilities of the Illinois Accelerated Pavement Tester
    Enhanced Capabilities of the Illinois Accelerated Pavement Tester
    Renshaw, Greg ;
    Al-Qadi, Imad L.
    2024-08-01 | PDF
    After being in service for nearly 20 years, the Illinois Accelerated Pavement Tester (I-APT) was upgraded to provide enhanced capabilities for accelerated pavement testing. In addition to a new control system, the improvement included a newly designed load carriage, which allows for testing with a tandem half-axle, axle yaw, and shear loading (brea ...
  • Inventorying Documenting and Configuring Traffic Management System Assets and Resources Current Practices
    Inventorying, Documenting, and Configuring Traffic Management System Assets and Resources — Current Practices
    Lukasic, Daniel ;
    Belella, Paul
    2024-08-01 | PDF
    This report explores the benefits of developing, using, and maintaining an inventory of traffic management system (TMS) assets and resources for State and local agencies. By documenting, inventorying, and configuring assets and resources, agencies can enhance the day-to-day management and operation of TMSs. Agencies may also benefit from incorporat ...
  • Design and Rehabilitation Strategies for Permeable Friction Course Pavements
    Design and Rehabilitation Strategies for Permeable Friction Course Pavements
    Arámbula-Mercado, Edith ;
    Estakhri, Cindy
    2024-08-01 | PDF
    Thousands of miles of permeable friction course (PFC) pavements have performed well for the last 10 to 15 years on Texas highways. PFC pavement reduces hydroplaning, splash and spray, and pavement noise and improves ride quality and safety in wet weather. Hundreds of miles of PFC pavements are now at the end of their service life and need to be reh ...
  • Improving Smart Work Zone Deployments in Texas
    Improving Smart Work Zone Deployments in Texas
    Ullman, Gerald ;
    Miller, Matt
    2024-08-01 | PDF
    Smart work zones utilize technologies and strategies to enhance transportation safety, mobility, traveler satisfaction, and even construction/maintenance productivity through and around work zones. To date, there have been both positive and negative experiences with the technology. The objectives of this study were to determine why some smart work ...
  • Influencing Travel Behavior via an OpenSource Platform Phase 2 Brief
    Influencing Travel Behavior via an Open-Source Platform Phase 2 [Brief]
    Valdes, Didier M. ;
    Figueroa-Medina, Alberto M
    2024-08-01 | PDF
    This project uses the open-source platform OneBusAway (OBA) developed at USF to explore strategies that can influence travel behavior to increase transit ridership. OneBusAway currently provides real-time transit information to users on a full range of devices and communication platforms, such as mobile apps, and serves more than 400,000 individual ...
  • ODOTs Snow and Ice Performance Evaluation Tools A Student Transportation Advancement Research STAR Project
    ODOT‘s Snow and Ice Performance Evaluation Tools - A Student Transportation Advancement Research (STAR) Project
    Masanja, Ntemi Methusela ;
    Mihayo, Meshack P
    2024-08-01 | PDF
    Severe winter weather poses a significant threat to road users, primarily due to slippery road surfaces, which considerably increase the risk of crashes and injuries. Additionally, such conditions can disrupt traffic flow on highways, causing speed reductions, decreased highway capacity, or even complete traffic lockdowns. Most Departments of Trans ...
  • ODOTs Snow and Ice Performance Evaluation Tools A Student Transportation Advancement Research STAR Project Fact Sheet
    ODOT‘s Snow and Ice Performance Evaluation Tools - A Student Transportation Advancement Research (STAR) Project [Fact Sheet]
    Masanja, Ntemi Methusela ;
    Mihayo, Meshack P
    2024-08-01 | PDF
    Severe winter weather poses a significant threat to road users, primarily due to slippery road surfaces, which considerably increase the risk of crashes and injuries. Additionally, such conditions can disrupt traffic flow on highways, causing speed reductions, decreased highway capacity, or even complete traffic lockdowns. Most Departments of Trans ...
  • Evaluation of Manual Thermal Brake Screening Systems
    Evaluation of Manual Thermal Brake Screening Systems
    Koo, Jeeyen ;
    Leddy, David
    2024-08-01 | PDF
    In 2021, manual thermal brake screening systems were installed at Lyon EB and Rowan County weigh stations. Two additional units were installed at Laurel SB and Scott County weigh stations the following year. Although this system is called a thermal brake screening system, its thermal camera images are used to find both brake and tire-related violat ...
  • Laboratory Information Materials Management System LIMMS Development Planning
    Laboratory Information Materials Management System (LIMMS) Development Planning
    Tessier, Russell
    2024-07-31 | PDF
    The purpose of this project was to conduct a gap analysis that examined the needs of LIMMS users from system design and functionality to security. The analysis took into consideration the multiple platforms used by MassDOT currently for material and contract management. During the project, feedback was obtained from MassDOT users via private meetin ...
  • Steel Bridge Coating and Recoating Warranty Requirements
    Steel Bridge Coating and Recoating Warranty Requirements
    Padilla, Felix ;
    Ault, Pete
    2024-07-30 | PDF
    The service life of steel bridge coatings in Florida is occasionally shorter than the intended design life, resulting in the need for increased maintenance painting. This project examined the value of warranty terms potentially included in painting contracts to improve the quality and durability of steel bridge coatings. The research found that the ...
  • Investigation Crash Testing and Evaluation of a MASH TL4 Precast Concrete Bridge Rail
    Investigation, Crash Testing, and Evaluation of a MASH TL-4 Precast Concrete Bridge Rail
    Faller, Ronald K. ;
    Bielenberg, Robert W.
    2024-07-26 | PDF
    Recently, a precast concrete bridge barrier with unique connection details for barrier-to-deck and barrier-to-barrier interfaces was developed at the Institute of Transportation (InTrans)-Iowa State University (ISU) for ABC applications. Successful laboratory quasi-static tests led to the current study, in which the primary objectives were to deter ...
  • Artificial Intelligence AI and Markov Process Based Data Mining on Predicting Bridge Operating Conditions
    Artificial Intelligence (AI) and Markov Process Based Data Mining on Predicting Bridge Operating Conditions
    Fang, F Clara ;
    JimenezGil, Daniel
    2024-07-22 | PDF
    To facilitate bridge management decision-making and implement preventive maintenance strategies, we endeavor to develop a machine learning model to predict the future condition rating of bridges using historical inspection data, with a funding contract with Connecticut State’s Department of Transportation. We collect the data from the USA's Nationa ...
  • Chemical Subgrade Stabilization of Tennessee Soils Recommended Practices
    Chemical Subgrade Stabilization of Tennessee Soils – Recommended Practices
    VandenBerge, Daniel R ;
    Mohr, Benjamin J
    2024-07-15 | PDF
    This report summarizes the state-of-practice in the evaluation, design, and implementation of chemical subgrade stabilization. Four Tennessee soils (two A-6 and two A-7-6) were obtained and mix designs were prepared to provide examples of the testing required for chemical stabilization. The stabilized soils met the design unconfined strength criter ...
  • Design and Operational Assessment of a Railroad Track Robot for Railcar Undercarriage Condition Inspection Article
    Design and Operational Assessment of a Railroad Track Robot for Railcar Undercarriage Condition Inspection [Article]
    Ahmadian, Mehdi ;
    Kasch, James M
    2024-07-10 | PDF
    This research assesses the design and track operation of a track crawler robot (TCR) for practical and easy inspection of stationary railcars’ undercarriages in an effort to detect any pending failures or assess any security risk of out-of-sight objects. The TCR includes a drive system consisting of two AC motors that operate a track (like tank tra ...
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