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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 2121 - 2140 of 36873 results
  • Leveraging Artificial Intelligence AI Techniques to Detect Forecast and Manage Freeway Congestion Technical Report
    Leveraging Artificial Intelligence (AI) Techniques to Detect, Forecast, and Manage Freeway Congestion: Technical Report
    Das, Subasish ;
    Tsapakis, Ioannis
    2023-09-01 | PDF
    Enhancing the quality and efficiency of the Texas surface transportation system necessitates reliable predictions about the initiation and dispersion of prolonged congestion, as well as effective tracking of atypical events and their potential evolution. Artificial intelligence (AI) offers a unique avenue for achieving these goals, presenting an op ...
  • 07146 Develop Guidance for Local Government Building Codes for Bridges
    0-7146: Develop Guidance for Local Government Building Codes for Bridges
    Shahandashti, Mohsen ;
    Chao, Shih-Ho (Simon)
    2023-08-31 | PDF
    The design, construction, and maintenance of off-system bridges vary across local governments (cities and counties), often resulting in inferior performance compared to bridges managed by state highway agencies. Limited knowledge of local government practices hinders understanding of the factors contributing to these deficiencies and poses challeng ...
  • Determine the Influence of Thermal Segregation on Current Asphalt Mixtures Project Summary
    Determine the Influence of Thermal Segregation on Current Asphalt Mixtures [Project Summary]
    Sebesta, Stephen ;
    Kim, Jinho
    2023-08-31 | PDF
    Researchers conducted a comprehensive literature review to gather information on thermal segregation in asphalt mixes. Various hardware systems, specifications, and previous research studies were summarized and documented to understand the existing knowledge on the subject.
  • Automated IDEAL Cracking and Rutting Tests Project Summary
    Automated IDEAL Cracking and Rutting Tests [Project Summary]
    Zhou, Fujie ;
    Roa, Jorge
    2023-08-31 | PDF
    The researchers developed the Asphalt Mixture Automated Testing System with Zero Intervention (AMAZE), shown in Figure 1. The AMAZE includes five units: • An air voids measurement unit. • A specimen storage unit. • Two temperature conditioning units, one for room temperature and the other for high temperature (e.g., 50 °C). • A material testing loa ...
  • Develop Enhanced Protection of Median Openings Between Parallel Bridge Structures Project Summary
    Develop Enhanced Protection of Median Openings Between Parallel Bridge Structures [Project Summary]
    Kovar, James C. ;
    Bligh, Roger
    2023-08-31 | PDF
    The objective of this project was to develop a median opening protection system (MOPS) suitable for implementation in sloped medians between parallel bridges. One primary goal was to use currently available technologies to speed implementation. The MOPS was intended to prevent motorists from experiencing these roadway departure crashes between para ...
  • Develop Standardized Operational Evaluation of WrongWay Driving Detection Technologies Project Summary
    Develop Standardized Operational Evaluation of Wrong-Way Driving Detection Technologies [Project Summary]
    Finley, Melisa D. ;
    Venglar, Steven P.
    2023-08-31 | PDF
    From 2010 to 2019, approximately 1700 wrong-way driving (WWD) crashes occurred in Texas on controlled-access highways (e.g., freeways and interstates). On average, about 170 WWD crashes occurred each year, and 10 percent resulted in a fatality. To reduce the number of wrong-way (WW) maneuvers and associated crashes on Texas freeways, the Texas Depa ...
  • Traffic Control Device Analysis Testing and Evaluation Program Project Summary
    Traffic Control Device Analysis, Testing, and Evaluation Program [Project Summary]
    Finley, Melisa D. ;
    Habermann, John
    2023-08-31 | PDF
    Evaluating the numerous types of traffic control devices (TCDs) newly available and installed across Texas roadways is a key for the Texas Department of Transportation (TxDOT) to maintain roadway safety and proper performance of TCDs. Evaluations are also needed in order to cost-effectively implement new devices and technologies for continual impro ...
  • 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 ...
  • 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 ...
  • 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.
  • 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 ...
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