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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 1761 - 1780 of 36104 results
  • 07074 Increase the Allowable Content of Recycled Crushed Concrete Aggregate in Class P Concrete
    0-7074: Increase the Allowable Content of Recycled Crushed Concrete Aggregate in Class P Concrete
    Folliard, Kevin J. ;
    Drimalas, Thanos
    2023-08-31 | PDF
    Over 140 million tons of recycled concrete aggregate (RCA) are produced in the United States per year (ACPA, 2009), and this material has been used in a host of transportation infrastructure applications, including fills, embankments, bases, subbases, and concrete pavements. Currently, TxDOT limits the maximum amount of recycled crushed concrete fi ...
  • Implementation of Retroreflective Pavement Markers RPMs in Rumble Strips as a Method to Enhance Driving Conditions After Snowplow Operations Project Summary
    Implementation of Retroreflective Pavement Markers (RPMs) in Rumble Strips as a Method to Enhance Driving Conditions After Snowplow Operations [Project Summary]
    Ferron, Raissa ;
    Al-Amin, Md
    2023-08-31 | PDF
    This implementation project aimed to validate the results of a previous project (0-5665) by determining the rumble strip depth that can provide adequate protection to the markers while also still being visible to road users. The research team identified additional sites to deploy embedded markers in rumble strips. Two marker types (low profile mark ...
  • Evaluation of Seamless Bridges Project Summary
    Evaluation of Seamless Bridges [Project Summary]
    Helwig, Todd ;
    Chen, Xiaoyi
    2023-08-31 | PDF
    The research study included experimental testing and numerical modeling to obtain and develop much needed experimental data and analytical tools to study the performance of seamless systems, identify design issues, and propose design guidelines for the U.S. practice.
  • Implementation of GeosyntheticStabilized Roadways for Base Course Reduction Field Monitoring and Design Recommendations Project Summary Report
    Implementation of Geosynthetic-Stabilized Roadways for Base Course Reduction: Field Monitoring and Design Recommendations [Project Summary Report]
    Zornberg, Jorge G. ;
    Sankaranarayanan, Subramanian
    2023-08-31 | PDF
    Geogrids are used within the base or as a subgrade/base interface layer for enhancing the performance of flexible and rigid pavements. While there has been significant use, particularly in Texas, of geogrid-reinforced pavements, limited research has dealt with the methodologies of quantifying their influence on pavement performance. In the state of ...
  • Texas Guidelines for Optimizing Roadway CrossSection Project Summary
    Texas Guidelines for Optimizing Roadway Cross-Section [Project Summary]
    Brewer, Marcus A. ;
    Dixon, Karen
    2023-08-31 | PDF
    The project team compiled and reviewed existing road cross-section guidance (for urban, suburban, and rural environments), along with research findings, to identify content that would be appropriate for inclusion in Texas-based guidelines for cross-section optimization. A subsequent task focused on considering the data needs for assessing a propose ...
  • Determine the Adequacy of Installation of Existing Roadside Barriers on HighSpeed Roadways Summary Report
    Determine the Adequacy of Installation of Existing Roadside Barriers on High-Speed Roadways [Summary Report]
    Bligh, Roger ;
    Chamargore, Sonal
    2023-08-31 | PDF
    Posted speed limits on Texas roadways have increased in recent years. Texas now has many miles of roadways posted at speeds of 75 mph and above. Barrier systems (e.g., guard fence, median barriers, and bridge rails) are currently tested and evaluated at a design impact speed of 62 mph. The performance limits of existing barriers are not known. Some ...
  • Leveraging Artificial Intelligence AI Techniques to Detect Forecast and Manage Freeway Congestion Project Summary
    Leveraging Artificial Intelligence (AI) Techniques to Detect, Forecast, and Manage Freeway Congestion [Project Summary]
    Tsapakis, Ioannis ;
    Das, Subasish
    2023-08-31 | PDF
    In this research project, researchers designed a comprehensive survey to understand the freeway congestion reduction practices state departments of transportation employed by using big data. This survey addressed topics such as data collection methods, data analysis techniques, big data platform usage, report creation practices, and future needs.
  • 57008 Implementation of Electrical Resistivity Imaging Manual
    5-7008: Implementation of Electrical Resistivity Imaging Manual
    Shahandashti, Mohsen ;
    Hossain, Sahadat
    2023-08-31 | PDF
    Texas Department of Transportation (TxDOT) annually encounters a substantial number of claims and change orders that have a detrimental effect on project costs and schedules. State Departments of Transportation (DOTs) spend approximately $10 million annually on geotechnical-related change orders, accounting for about 7% of the total expenditures as ...
  • 07060 Measuring Faulting on Jointed Concrete Pavements Summary
    0-7060: Measuring Faulting on Jointed Concrete Pavements [Summary]
    Prozzi, Jorge A. ;
    Li, Ruohan
    2023-08-31 | PDF
    Current equipment to measure faulting of jointed concrete pavements at the network level is ineffective and inefficient. One the one hand, joint detection at high speeds is challenging. On the other hand, the actual measurement is not accurate and fails to capture the transverse variability of faulting. In this project, a high- definition, high-spe ...
  • Implementation of Concrete Overlay Evaluation and Design Project Summary Report
    Implementation of Concrete Overlay Evaluation and Design [Project Summary Report]
    Won, Moon ;
    Koirala, Niwesh
    2023-08-31 | PDF
    Researchers evaluated the existing pavement conditions of the candidate section. A visual survey was conducted to identify existing distresses that are prevalent on the CPCD. An FWD testing was conducted to measure the structural capacity of the CPCD by obtaining slab deflections and calculating the load transfer efficiency (LTE). The CRCP overlay ...
  • Develop Sediment Control Approved Product List Project Summary
    Develop Sediment Control Approved Product List [Project Summary]
    McFalls, Jett ;
    Foster, Derrold
    2023-08-31 | PDF
    Sediment control devices (SCDs) are used on construction sites to retain sediment and prevent stormwater from adversely affecting adjacent waterways. SCDs include silt fences, wattles, sediment logs and basins, filter dams, and inlet protection devices. These products are designed to be installed for specific applications (e.g., curb inlets, drop i ...
  • Performance of Skewed Reinforcing in InvertedT Bridge Caps Project Summary Report
    Performance of Skewed Reinforcing in Inverted-T Bridge Caps [Project Summary Report]
    Mo, Y.L. ;
    Joshi, Bhagirath
    2023-08-31 | PDF
    In this research, two significant ITBCs are selected to investigate the structural performance of skew reinforcing. The global models for ITBC 2 (skew angle 430) and ITBC 7 (skew angle 330) are established with four columns, I-girders in the forward and backward span, and a deck. Each ITBC is simulated in 15 cases of Static Test-1. Further, two cri ...
  • Illinois Highway Materials Sustainability Efforts 2022
    Illinois Highway Materials Sustainability Efforts 2022
    Morse, Kelly L.
    2023-08-29 | 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 ...
  • Volume 1 Urban Driver Mental Frameworks and Implications
    Volume 1: Urban Driver Mental Frameworks and Implications
    Eluru, Naveen ;
    Tice, Patricia
    2023-08-23 | PDF
    Over the last 85 years, engineers and researchers have tweaked and analyzed every minute detail of roadway design with one goal: optimizing vehicular speed. Although the industry has been looking seriously at design for other modes since the late 1980’s, the vast majority of the money and energy has been poured into examining every nuance and detai ...
  • Guidelines to Enhance the Constructability of Diverse Modern and Unconventional Intersections and Interchanges DMUII
    Guidelines to Enhance the Constructability of Diverse, Modern, and Unconventional Intersections and Interchanges (DMUII)
    Rasdorf, William ;
    Rouphail, Nagui
    2023-08-15 | PDF
    The current focus on promoting sustainability in the United States transportation infrastructure has led to adopting Diverse, Modern, and Unconventional Intersections and Interchanges (DMUII) to improve traffic flow while ensuring safety. However, the adoption of DMUII designs presents challenges, including a learning curve for the public and contr ...
  • Economic Contribution of Rail in North Carolina
    Economic Contribution of Rail in North Carolina
    Brock, Tim ;
    Hassett, Ryan
    2023-08-11 | PDF
    This research effort is part of a collaborative research project between the North Carolina Department of Transportation (NCDOT) and North Carolina State University’s (NCSU’s) Institute for Transportation Research and Education (ITRE). NCDOT Rail Division's mission is the “…safe and efficient movement of people and goods on North Carolina's railroa ...
  • Truck Platooning Effects on Girder Bridges Phase IIService
    Truck Platooning Effects on Girder Bridges: Phase II-Service
    Steelman, Joshua S. ;
    Puckett, Jay A.
    2023-08-11 | PDF
    Truck platooning—wirelessly linking two or more trucks to travel in a closely spaced convoy—is federally promoted to save fuel, improve the environment, and improve traffic operations. Platooning places trucks much closer than current design codes anticipate. While this strategy can provide higher fuel efficiency, it also can potentially overload s ...
  • Measuring and Improving the Effectiveness of ADOTs Employee Learning and Development Program
    Measuring and Improving the Effectiveness of ADOT’s Employee Learning and Development Program
    Perry, MacKenna ;
    Manseth, Kristi
    2023-08-09 | PDF
    Arizona Department of Transportation's (ADOT) Employee and Business Development (EBD) office develops and provides required and elective training to ADOT staff and to external stakeholders. For its training programs, EBD’s objectives are to: (1) Improve employee competence and performance to enhance the performance of the agency; (2) Improve employ ...
  • Microbial Concrete Sealer
    Microbial Concrete Sealer
    El-Hajj, Bashear ;
    Pitell, Sarah
    2023-08-05 | PDF
    Portland Cement Concrete (PCC) is the most widely used construction material due to its versatility, durability, and economy (Mindess et al. 2003). However, PCC is also a quasi-brittle material that has low tensile strength and ductility, as well as weak resistance to the propagation of cracks. Also, problems related to shrinkage, durability and wo ...
  • MultiModal Intelligent Traffic Signal System MMITSS Phase III Extension for Additional Enhancements
    Multi-Modal Intelligent Traffic Signal System (MMITSS) Phase III Extension for Additional Enhancements
    Zhou, Kun ;
    Gan, Qijian
    2023-08-03 | PDF
    In the California Connected Vehicle (CV) Testbed, four intersections have been instrumented with NoTraffic sensors for more accurate detection of multi-modal traffic within the intersection conflict area, and six operational High Intensity Activated CrossWalK (HAWK) signals have been installed to enhance the safety for pedestrians and cyclists whil ...
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