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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 1461 - 1480 of 35452 results
  • Enhancing Freeway Safety Prediction Models Technical Report
    Enhancing Freeway Safety Prediction Models: Technical Report
    Pratt, Michael P. ;
    Geedipally, Srinivas R.
    2023-09-01 | PDF
    Safety prediction models have been developed for urban freeway segments in Texas and elsewhere to apply to cross sections up to 10 lanes wide. These models are documented resources such as TxDOT’s Roadway Safety Design Workbook and the Highway Safety Manual and applied in several spreadsheet-based analysis tools. These tools are acknowledged in the ...
    Supporting Files
  • Continuous Moisture Measurement during Pavement Foundation Construction
    Continuous Moisture Measurement during Pavement Foundation Construction
    Baker, Mark ;
    Zuniga, Isaac E
    2023-09-01 | PDF
    The variations in electromagnetic and electric properties with the moisture content of several geomaterials were assessed in this report to demonstrate their viability in estimating the moisture content of compacted geomaterials. A prototype device was also designed and fabricated to estimate the moisture content of compacted geomaterials by measur ...
  • RightTurn Safety for WalkingBicycling Impacts of CurbCorner Radii and Other Factors
    Right-Turn Safety for Walking/Bicycling: Impacts of Curb/Corner Radii and Other Factors
    Singleton, Patrick A. ;
    Mekker, Michelle
    2023-09-01 | PDF
    The objective of this research project is to understand factors (especially curb/corner radii) affecting safety at intersections involving right-turning vehicles and pedestrians/bicyclists. A mixed-methods approach was used, combining crash data analysis with analysis of observational video data. For the crash analysis, data were assembled about mo ...
  • Effective JumpOuts for WhiteTailed Deer and Mule Deer
    Effective Jump-Outs for White-Tailed Deer and Mule Deer
    Huijser, Marcel P. ;
    Getty, Samantha C
    2023-09-01 | PDF
    The height of jump-outs along a fenced road corridor should be low enough for the target species to readily jump down from the fenced road corridor to the safe side, or the habitat side, of the fence. At the same time, the jump-outs should be high enough to discourage animals from jumping from the habitat side of the fence up into the fenced road c ...
  • Identification of Enhanced Moisture Susceptibility Testing for Asphalt Pavements
    Identification of Enhanced Moisture Susceptibility Testing for Asphalt Pavements
    Green, Roger ;
    Rodezno, Carolina
    2023-09-01 | PDF
    The Tensile Strength Ratio (TSR) test is the most widely used test by state agencies based on a survey and specification review. The next most widely used test is the Hamburg Wheel-Track Test (HWTT). The survey also found there has been a move from the TSR test to the HWTT by state agencies over the last 10 years. Limited TSR and HWTT testing for t ...
  • Identification of Enhanced Moisture Susceptibility Testing for Asphalt Pavements Fact Sheet
    Identification of Enhanced Moisture Susceptibility Testing for Asphalt Pavements [Fact Sheet]
    Green, Roger ;
    Rodezno, Carolina
    2023-09-01 | PDF
    Over the years, efforts have been made to identify test procedures with appropriate moisture conditioning methods to quantify the potential of moisture susceptibility in asphalt mixtures. Some of the most commonly used test procedures include Modified Lottman Test (AASHTO T 283), Hamburg Wheel-Track Test (AASHTO T 324), and visual strip rating test ...
  • Best Practices for Construction Site Stormwater Treatment Using Flocculants
    Best Practices for Construction Site Stormwater Treatment Using Flocculants
    Kazaz, Billur ;
    Clampitt, Jannell
    2023-09-01 | PDF
    Unmanaged construction stormwater runoff can pose a risk for the quality of downstream water bodies. Temporary sediment control practices are designed to capture sediment particles and reduce the turbidity of discharge; however, commonly used practices have limited performance in capturing fine-sized sediment particles. Flocculants can be introduce ...
  • Testing Protocol Data Storage and Recalibration for PavementME Design
    Testing Protocol, Data Storage, and Recalibration for Pavement-ME Design
    Haider, Syed Waqar ;
    Kutay, M. Emin
    2023-09-01 | PDF
    This study focuses on calibrating and validating performance models for pavement in Michigan and provides testing protocols for field and laboratory material testing. The research team selected various new and rehabilitation projects for flexible and rigid pavements to evaluate previous calibration efforts, verify global models in the Pavement-ME, ...
  • Ohios Research Initiative for Locals ORIL Research OnCall Task 6 An Experimental Study on the Influence of Polyester Fibers Plastic Glass and Tire Waste on LowStrength Concrete Performance
    Ohio’s Research Initiative for Locals (ORIL) Research On-Call Task 6 – An Experimental Study on the Influence of Polyester Fibers, Plastic, Glass, and Tire Waste on Low-Strength Concrete Performance
    Khoury, Issam ;
    Green, Roger
    2023-09-01 | PDF
    Spearheaded by Defiance County, the research to develop a cost-efficient, flexible concrete mix was carried out by Ohio University's Departments of Civil and Environmental Engineering. The study explored the integration of locally-sourced waste materials—tire shreds, fiberglass, polyester fiber, and plastic waste—into the concrete mix. Rigorous tes ...
  • Evaluation of Messaging Techniques to Increase Vehicle Spacing at Work Zones
    Evaluation of Messaging Techniques to Increase Vehicle Spacing at Work Zones
    Oh, Minsoo ;
    Shaw, John
    2023-09-01 | PDF
    Rear-end collisions in work zones, induced primarily by speeding and tailgating, are a predominant concern for roadway safety. Although considerable research has shed light on the dangers and implications of speeding within these zones, there exists a conspicuous research gap on tailgating behaviors. To address this gap, the present project was con ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 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 ...
  • 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.
  • 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.
  • 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.
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