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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 1641 - 1660 of 36104 results
  • Durability of Concrete Using Low Slag Cement Contents
    Durability of Concrete Using Low Slag Cement Contents
    Riding, Kyle A ;
    Ferraro, Christopher C.
    2023-10-01 | PDF
    Supplemental cementitious materials (SCMs), such as fly ash, slag, silica fume, and metakaolin have become commonplace in Florida concrete, particularly for high durability or high-strength concrete. The Florida Department of Transportation (FDOT) currently allows fly ash to be used as a cement replacement at 18-50% levels and slag cement to be sub ...
  • Evaluating and Validating Technology Options for Estimating Transit Vehicle Occupancy in Real Time
    Evaluating and Validating Technology Options for Estimating Transit Vehicle Occupancy in Real Time
    Sun, Yanshuo ;
    Guo, Qianwen
    2023-10-01 | PDF
    The primary goal of this project was to evaluate and validate various technologies for collecting transit vehicle occupancy information in real time. The specific objectives include the following: (1) Identify a list of potential technology alternatives for transit vehicle occupancy estimation by scanning the academic literature, news, and technica ...
  • Experimental Validation of Repair Methods for EarthquakeDamaged Bridges Incorporating ITDs Precast Pier System
    Experimental Validation of Repair Methods for Earthquake‐Damaged Bridges Incorporating ITD’s Precast Pier System
    Hogarth, Kathryn E ;
    Acharya, Mahesh
    2023-10-01 | PDF
    The use of Ultra‐High‐Performance Concrete (UHPC) is gaining popularity for bridge applications in North America. UHPC has been used both in the construction of new and retrofitting of existing bridges. In this research, a novel use of UHPC as a concrete jacket for retrofitting of plastic hinge zones in cast‐in‐place and precast piers is proposed. ...
  • A Feasibility Study for Establishing A Regional Road Track Pavement Testing Facility in Wyoming Data Management Plan
    A Feasibility Study for Establishing A Regional Road Track Pavement Testing Facility in Wyoming [Data Management Plan]
    Hafez, Marwan ;
    Ksaibati, Khaled
    2023-10-01 | PDF
    The purpose of this research project is to: evaluate the feasibility of constructing a state-of-the-art pavement testing facility on I-80 in Wyoming to conduct pavement research studies for the dry freeze climatic region.
  • Adapting Asphalt Mixtures for Tougher Rural Roads Summary
    Adapting Asphalt Mixtures for Tougher Rural Roads [Summary]
    Ulring, Joel D ;
    Barman, Manik
    2023-10-01 | PDF
    Seasonal and daily temperature variations, freeze-thaw cycles and other environmental factors lead to pavement distress on low-volume rural roads. Modifying asphalt mixtures could improve pavement resistance to these environmentally driven distresses. A comparison of the mechanical properties and performances of selected asphalt mixtures identified ...
  • Effectively Implementing Machine Learning with Office of Materials Technology Research Summary
    Effectively Implementing Machine Learning with Office of Materials Technology [Research Summary]
    Zhang, Yunfeng
    2023-10-01 | PDF
    Machine learning models provide significant value for planning and asset management purposes by maximizing the usefulness of past data collection for decision-making and policy development. Newer and more powerful machine learning models not available in previous applications and research in highway transportation fields are investigated to address ...
  • Investigation of the Impact of Milling and Construction on the Bond Strength of Remaining Thin Scab Layers Summary
    Investigation of the Impact of Milling and Construction on the Bond Strength of Remaining Thin (Scab) Layers [Summary]
    Zou, Jian ;
    Rilko, Wayne
    2023-10-01 | PDF
    Field investigation in Florida indicated that there was a potential link between weakly-bonded scabbed areas and slippage failure in the braking zones. Also, evidence from NCAT test track studies suggested that localized interface debonding might lead to surface cracking under free-rolling traffic. The primary objective of this research was to dete ...
  • Modernizing Right of Way Maps with Geographic Information System Technology Brief
    Modernizing Right of Way Maps with Geographic Information System Technology [Brief]
    Bunting, Erin L ;
    Fitch, Matt
    2023-10-01 | PDF
    Since the Michigan Department of Transportation (MDOT) began archiving right of way (ROW) maps in the 1940s, MDOT has updated the information technologies it uses for map creation and archival. Past efforts to standardize this archive have revealed the need for a coordinated approach. With the goal of modernizing ROW maps using a geographic informa ...
  • Forecasting TSPLOST Revenues in Georgia
    Forecasting TSPLOST Revenues in Georgia
    Bluestone, Peter ;
    Jimenez, Benedict
    2023-10-01 | PDF
    Due to the long-term planning involved in the design and construction of transportation infrastructure projects, transportation planners need reliable long-run forecasts and stable sources of revenue over the project timeline. Funding streams typically vary from period to period due to inherent volatility in the funding source or unforeseen events, ...
  • Shear Friction Capacity of Corrugated Pipe Connection in Precast Footings Summary
    Shear Friction Capacity of Corrugated Pipe Connection in Precast Footings [Summary]
    Vasconcelos, Bruno ;
    Garber, David
    2023-10-01 | PDF
    Although new construction or replacement of bridges is many times in the best interest of the traveling public, high construction costs and potentially lengthy project delivery dates are hard to avoid. Using prefabricated bridge elements and systems (PBES) allows for reduced construction times and quicker turnaround times using Accelerated Bridge C ...
  • Traffic Safety Facts 2020 Data Race and Ethnicity
    Traffic Safety Facts 2020 Data: Race and Ethnicity
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2023-10-01 | PDF
    This fact sheet reports data on traffic fatalities by race and ethnicity, which might help develop countermeasures for those at risk. The term “race-ethnicity” is used to refer to the combined classification of race and ethnicity data. Of the 43,230 traffic fatalities in 2021, White people accounted for 50 percent while Black or African American pe ...
  • Measuring Pavement Density for Sustainable Centerline Joints Summary
    Measuring Pavement Density for Sustainable Centerline Joints [Summary]
    Haider, Syed W. ;
    Eckerd, Naomi
    2023-10-01 | PDF
    This research summary pertains to Report 2023-35, "BMP For Issues with Asphalt Centerline Joint and Intelligent Compaction for Local Agencies," published November 2023.
  • OSTR Research Roundup Newsletter October 2023
    OST-R Research Roundup Newsletter: October 2023
    United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology
    2023-10-01 | OST-R Research Roundup | PDF
    News from across OST-R and its research community.
  • Effectively Implementing Machine Learning with Office of Materials Technology
    Effectively Implementing Machine Learning with Office of Materials Technology
    Zhang, Yunfeng ;
    Xu, Jianshu
    2023-10-01 | PDF
    Machine learning models provide significant value for planning and asset management purposes by maximizing the usefulness of past data collection for decision-making and policy development. Newer and more powerful machine learning models not available in previous applications and research in highway transportation fields are investigated to address ...
  • FieldCuring Methods for Evaluating the Strength of Concrete Test Specimens
    Field-Curing Methods for Evaluating the Strength of Concrete Test Specimens
    Solanki, Pranshoo ;
    Xie, Haiyan (Sally)
    2023-10-01 | PDF
    The American Association of State Highway and Transportation Officials R 100 standard provides instructions for making and curing concrete test specimens in the field. However, further research is needed to compare the strength of the field-cured specimen with the strength of the actual in-place concrete item. The purpose of this combined laborator ...
  • Utilization of UHPC Bridge Superstructures in Texas Volume 2 Structural Analysis Design and FullScale Testing of Precast Pretensioned Girders
    Utilization of UHPC Bridge Superstructures in Texas— Volume 2: Structural Analysis, Design, and Full-Scale Testing of Precast, Pretensioned Girders
    Hueste, Mary Beth D. ;
    Mander, John
    2023-10-01 | PDF
    The use of ultra-high performance concrete (UHPC) in Texas bridges has potential to produce substantial improvements to bridge construction. Advanced material properties and superior durability of UHPC can result in significant design and construction benefits. An analytical feasibility study showed that UHPC bridge girders provide increased design ...
  • Utilizing Reclaimed Asphalt Pavement in Preservation Treatments
    Utilizing Reclaimed Asphalt Pavement in Preservation Treatments
    Sayeh, Watheq ;
    Al-Qadi, Imad L
    2023-10-01 | PDF
    The use of reclaimed asphalt pavement (RAP) has economic and environmental impacts. This report investigates the prospective use of RAP in preservation treatments (mainly chip sealing and microsurfacing) in Illinois. A review of the current state of knowledge and practice was conducted. The economic and logistic feasibility of using RAP in preserva ...
  • Evaluation of LargeFormat Metallic Additive Manufacturing AM for Steel Bridge Applications Final Report of Tensile Impact and Fatigue Testing Results
    Evaluation of Large-Format Metallic Additive Manufacturing (AM) for Steel Bridge Applications: Final Report of Tensile, Impact, and Fatigue Testing Results
    Sherman, Ryan J. ;
    Kessler, Hannah D
    2023-10-01 | PDF
    Wire arc additive manufacturing (WAAM) is an additive manufacturing process capable of printing using metallic feedstocks, such as traditional welding wire consumables. Advances in WAAM allow large-scale components, measured on the scale of feet, to be fabricated. A lack of fundamental knowledge of the material and fatigue behaviors of WAAM current ...
  • Evaluation of Roadway HighMast Tower Lighting
    Evaluation of Roadway High-Mast Tower Lighting
    Gibbons, Ronald B ;
    Bhagavathula, Rajaram
    2023-10-01 | PDF
    This study conducted an evaluation of high-mast roadway lighting, which included a review of Illinois Department of Transportation’s high-mast lighting specification and a field experiment. The lighting specification was reviewed for potential cost-saving measures. Recommended changes included the use of an external drive mechanism, a design-by-app ...
  • Drying Shrinkage Response of FullScale Thin Concrete Overlay on Asphalt Sections
    Drying Shrinkage Response of Full-Scale Thin Concrete Overlay on Asphalt Sections
    Mateos, Angel ;
    Harvey, John
    2023-10-01 | PDF
    Moisture-related shrinkage is regarded as one of the phenomena that has the largest impacts on the performance of jointed plain concrete pavements. Still, most mechanistic-empirical design methods oversimplify or ignore predictions of moisture-related shrinkage and its effects on concrete pavements. This study evaluates how moisture-related shrinka ...
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