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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 1581 - 1600 of 35865 results
  • Peak-Flow Frequency Analysis for 464 U.S. Geological Survey Streamgages in Illinois, Indiana, and Wisconsin, Based on Data Through Water Year 2017 [Supporting Dataset]
    O'Shea, Padraic S. ;
    Over, Thomas M.
    2023-09-25 | ZIP
    The U.S. Geological Survey (USGS) Central Midwest Water Science Center (CMWSC) completed a report (Over and others, 2023) documenting methods for peak-flow frequency analysis in Illinois following Bulletin 17C guidelines. The methods are used to provide estimates of peak-flow quantiles for 50-, 20-, 10-, 4-, 2-, 1-, 0.5-, and 0.2-percent annual exc ...
    Dataset
  • Data for Estimating Peak-Flow Quantiles for Selected Annual Exceedance Probabilities in Illinois [Supporting Dataset]
    Marti, Mackenzie K ;
    Over, Thomas M.
    2023-09-25 | ZIP
    The U.S. Geological Survey Central Midwest Water Science Center completed a report (Over and others, 2023) documenting the methods, results, and applications of an updated flood-frequency study for the State of Illinois. This data release contains data related to the analysis completed to determine peak-flow quantiles (flood frequency estimates) at ...
    Dataset
  • Optimal INS Monitor for GNSS Spoofer Tracking Error Detection
    Optimal INS Monitor for GNSS Spoofer Tracking Error Detection
    Kujur, Birendra ;
    Khanafseh, Samer
    2023-09-15 | PDF
    In this article, we describe a new method for detecting global navigation satellite system (GNSS) spoofing using an inertial navigation system. We specifically address the most difficult-to-detect scenario, in which a spoofer replicates the authentic GNSS signal with only additive errors due to the spoofer’s uncertainty in knowledge of the target’s ...
  • Advanced Testing and Characterization of Iowa Soils and Geomaterials
    Advanced Testing and Characterization of Iowa Soils and Geomaterials
    Aydin, Ceren ;
    Cetin, Bora
    2023-09-11 | PDF
    Accurate modeling of stress-strain characteristics of geomaterials plays a significant role in determining the achievable design life of roadways (e.g., granular roads and paved roads). Currently, the geomechanical characteristics of these materials are obtained from standard laboratory tests such as California Bearing Ratio (CBR) and standard resi ...
  • Improving Resilience of Transportation Infrastructure to Hurricane Damage
    Improving Resilience of Transportation Infrastructure to Hurricane Damage
    Underwood, B. Shane ;
    Montoya, Brina M.
    2023-09-10 | PDF
    Recent hurricanes and other extreme events have resulted in substantial damage to North Carolina’s transportation infrastructure. In some cases, the same locations have been damaged multiple times, but the amount of damage differs, which suggests that DOT strategies were effective. However, without a detailed quantification of the performance diffe ...
  • A Novel Network Screening Methodology for Rural LowVolume Roads
    A Novel Network Screening Methodology for Rural Low-Volume Roads
    Al-Kaisy, Ahmed ;
    Raza, Sajid
    2023-09-08 | PDF
    Low-volume roads (LVRs) are an integral part of the rural transportation network providing access to remote rural areas and facilitating the movement of goods from farms to markets. These roads pose unique challenges for highway agencies including those related to safety management on the highway network. Specifically, traditional network screening ...
  • RuralNonrural Divide in Car Access and Unmet Travel Need in the United States
    Rural–Nonrural Divide in Car Access and Unmet Travel Need in the United States
    Wang, Weijing ;
    Espeland, Sierra
    2023-09-07 | PDF
    Car access is practically a necessity to get around in rural areas of the United States. Yet approximately 4% of rural residents or 4.3 million people do not have a car. Despite important rural–nonrural differences in the built environment and how people travel, research on rural mobility disparities by car access is limited. This paper addresses t ...
  • Energy Dissipation Optimization for Circular Culverts
    Energy Dissipation Optimization for Circular Culverts
    Admiraal, David M. ;
    Zhang, Chi
    2023-09-05 | PDF
    Two types of energy dissipation devices at circular culvert outlets were investigated: full-length weirs and staggered weirs. Related literature was reviewed; a model broken-back circular culvert and dissipation basin was built; instrumentation was installed to measure discharge, piezometric head, and velocities; and four sizes of full-length and s ...
  • USFCUTR I4 FRAME Project Before Study Data Collection and Analysis of Safety and Mobility Conditions Prior to Implementation Summary
    USF-CUTR I-4 FRAME Project “Before” Study: Data Collection and Analysis of Safety and Mobility Conditions Prior to Implementation [Summary]
    Ponnaluri, Raj ;
    Lin, Pei-Sung
    2023-09-01 | PDF
    Florida Department of Transportation (FDOT) Interstate 4 (I-4) Florida’s Regional Advanced Mobility Elements (FRAME) project is of strategic importance to FDOTs’ Emerging Technologies and Connected Vehicle implementations and covers FDOT Districts 1,5,7 and Florida Turnpike Enterprise. The project has been let, with procurement of ITS systems under ...
  • Determining Bearing Resistance of Cantilever Sheet Piles Summary
    Determining Bearing Resistance of Cantilever Sheet Piles [Summary]
    Castellanos, Juan ;
    Song, Xiaoyu
    2023-09-01 | PDF
    Steel sheet pile walls have become a fixture of bridge construction. They are lightweight, meet foundational requirements, are corrosion resistant, and may be used for both temporary and permanent installation. However, in Florida, sheet pile walls are currently used for horizontal/lateral loads only.
  • Improving Design and Construction of Transportation Infrastructure through Bedrock Characterization 2023
    Improving Design and Construction of Transportation Infrastructure through Bedrock Characterization [2023]
    Ng, Kam W. ;
    Khatri, Lokendra
    2023-09-01 | PDF
    Tertiary bedrock formations are commonly encountered during the design and construction of transportation infrastructure in Wyoming. The engineering properties of these bedrocks are highly variable due to the geological processes to which they have been subjected including deposition, cementation, weathering and erosion. Furthermore, comprehensive ...
  • Update the Pile Design by CPT Software to Incorporate Newly Developed PileCPT Methods and Other Design Features Tech Summary
    Update the Pile Design by CPT Software to Incorporate Newly Developed Pile-CPT Methods and Other Design Features [Tech Summary]
    Abu-Farsakh, Murad ;
    Zhang, Zhongjie
    2023-09-01 | PDF
    This study presents the current research effort undertaken to identify the top-performed pile-CPT methods for accurately estimating the ultimate capacity of piles driven into Louisiana soils. Statistical analysis, Multidimensional Unfolding (MDU), and reliability analysis criteria were used to investigate the performance of 21 pile-CPT methods. The ...
  • Sensitivity Analysis of the IDEAL CT Test Using the Distinct Element Method
    Sensitivity Analysis of the IDEAL CT Test Using the Distinct Element Method
    Saadeh, Shadi ;
    El Asmar, Maria
    2023-09-01 | PDF
    Cracking is a primary mode of failure for asphalt concrete (AC), resulting in road damage and deterioration, and leading to an increase in road hazards and fatalities. Studying the fracture behavior of AC is an effective way to learn how to best enhance their cracking resistance. To do this, the indirect tensile cracking laboratory test (IDEAL-CT) ...
  • Optimizing of MassDOTs High Performance Asphalt Overlay HPOL Mixtures
    Optimizing of MassDOT’s High Performance Asphalt Overlay (HPOL) Mixtures
    Mogawer, Walaa S. ;
    Austerman, Alexander J.
    2023-09-01 | PDF
    The FHWA Targeted Overlay Pavement Solutions (TOPS) program presents innovative overlay solutions for asphalt and concrete pavements. The objective of this study was to conduct a comparative evaluation of three TOPS types for asphalt pavements (Asphalt Rubber Gap-Graded, Stone Matrix Asphalt, and High-Performance thin overlay) in terms of performan ...
  • Sensitivity Analysis of the IDEAL CT Test Using the Distinct Element Method Brief
    Sensitivity Analysis of the IDEAL CT Test Using the Distinct Element Method [Brief]
    Saadeh, Shadi ;
    El Asmar, Maria
    2023-09-01 | PDF
    Cracking is a primary mode of failure for asphalt concrete (AC), resulting in extensive road damage and deterioration which significantly leads to an increase in road hazards and fatalities. Therefore, understanding and studying the fracture behavior of AC provides an effective pathway to learn how to best enhance their cracking resistance, effecti ...
  • Developing MassachusettsSpecific Trip Generation Models for Land Use Projects
    Developing Massachusetts-Specific Trip Generation Models for Land Use Projects
    Xie, Yuanchang ;
    Loesch, Brandon
    2023-09-01 | PDF
    Vehicle trip generation is used to identify potential transportation impacts associated with new development projects and to provide a substantive basis for determining appropriate impact mitigation strategies. In the United States, trip rate estimation typically relies on vehicle trip rates for specific land use types as provided in the Trip Gener ...
  • Lightweight Deflectometer for Quality Assurance of Compacted Sublayers and Earthwork
    Lightweight Deflectometer for Quality Assurance of Compacted Sublayers and Earthwork
    Simon, Doug P ;
    LaBelle, Jacqueline
    2023-09-01 | PDF
    This report documents and presents the results of a study for implementation of lightweight deflectometer (LWD) testing for construction Quality Assurance (QA) in Alaska. The research evaluated empirical values, control strip testing, and laboratory testing to determine LWD target values. The results indicate control strip testing is the preferred ...
  • Reducing Concrete Cure Times for Bridge Substructure Components and Box Culverts
    Reducing Concrete Cure Times for Bridge Substructure Components and Box Culverts
    Qadri, Faisal ;
    Garg, Nishant
    2023-09-01 | PDF
    This report investigated pathways to reduce concrete curing time while maintaining mechanical and durability performance. Among several options such as admixtures, supplementary cementitious materials, and low water-to-cement ratio, researchers explored two mix designs in a field demonstration project. For Stage I of the project, a low water-to-cem ...
  • Developing Smart Signs for Traffic Control in Work Zones Summary
    Developing Smart Signs for Traffic Control in Work Zones [Summary]
    Sandberg, Wayne ;
    Morris, Nichole
    2023-09-01 | PDF
    Providing traffic control in work zones is one of the highest risk jobs in the country. Flaggers are often considered the first line of defense against distracted, inattentive or aggressive motorists who may intrude into these work areas.
  • Assurance of Machine LearningBased Aerospace Systems Towards an Overarching PropertiesDriven Approach
    Assurance of Machine Learning-Based Aerospace Systems: Towards an Overarching Properties-Driven Approach
    Paul, Saswata ;
    Prince, Dan
    2023-09-01 | PDF
    Traditional process-based approaches of certifying aerospace digital systems are not sufficient to address the challenges associated with using Artificial Intelligence (AI) or Machine Learning (ML) techniques. To address this, agencies are evaluating an alternative Means of Compliance (MoC) called the Overarching Properties (OP). The goals for this ...
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