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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 5581 - 5600 of 36958 results
  • Development of Models for the Prediction of Shear Strength of Swelling Clays
    Development of Models for the Prediction of Shear Strength of Swelling Clays
    Katti, Dinesh R ;
    Katti, Kalpana S
    2019-12-01 | PDF
    Accurate prediction of the shear strength of swelling clays is critical for the design of infrastructure. Damage caused to U.S. infrastructure by swelling clays is estimated to be about $13 billion per year. Overestimation of strength can lead to failures, and underestimation can lead to an increase in project cost. Due to the small size of the cla ...
  • The Application of Unmanned Aerial Systems In Surface Transportation Volume IIE Assessment of Unmanned Aircraft System Situational Awareness Technology to Support Applications in Surface Transportation
    The Application of Unmanned Aerial Systems In Surface Transportation – Volume II-E: Assessment of Unmanned Aircraft System Situational Awareness Technology to Support Applications in Surface Transportation
    Plotnikov, Michael
    2019-12-01 | PDF
    Rapid proliferation of drones creates serious challenges to transportation facilities and the traveling public. Designed to expand and update the results of the Phase I Counter-Unmanned Aircraft System (CUAS) study, the Phase II study presented herein was conducted to review the current technologies available to detect, track, and identify small UA ...
  • Assessing the Effectiveness of Connected Vehicle Technologies based on Driving Simulator Experiments [supporting datasets]
    Wu, Yina ;
    Yue, Lishengsa
    2019-12-01 | PDF
    Connected vehicle technology is expected to reduce crashes and improve roadway safety overall despite its effect being dependent on the content of crash scenarios. The reason behind this is that the heterogeneity between crash scenarios may cause variation in a driver’s perception and interpretation of the crash scenarios. Further, the heterogeneit ...
    Dataset Supporting Files
  • A Machine Vision Approach for Estimating Motion Discomfort in Simulators and in Self-Driving [supporting datasets]
    Lee, John D. ;
    Alsaid, Areen
    2019-12-01 | PDF
    Motion discomfort in highly automated vehicles and in simulators represents a persistent problem that might be mitigated if it can be monitored. In driving simulators, motion discomfort can compromise data collection. In highly automated vehicles, motion discomfort can discourage people from riding in such vehicles, undermining the potential safety ...
    Dataset Supporting Files
  • Adding Carbon to the Equation in Online Flight Search [supporting datasets]
    University of California, Davis. Institute of Transportation Studies  ...
    2019-12-01 | PDF
    This study explores the potential to promote lower-emissions air travel by providing consumers with information about the carbon emissions of alternative flight choices in the context of online flight search and booking. Researchers surveyed over 450 UC Davis faculty, researchers, and staff, asking them to choose among hypothetical flight options f ...
    Dataset Supporting Files
  • Pavement Life Comparison for Different Traffic Scenarios [supporting datasets]
    Zhou, Fujie ;
    Hu, Sheng
    2019-12-01 | PDF
    The data was determined in 2017 in Texas A&M Transportation Institute using Texas Mechanistic-Empirical Pavement Design and Analysis (TxME) program. It presents the pavement damage such as rutting and cracking development with time. Three scenarios were compared: regular traffic, Automated vehicles (AV) which keeps narrow wandering within the lane, ...
    Dataset Supporting Files
  • Effectiveness of Incentives and FollowUp on Increasing Survey Response Rates and Participation in Field Studies
    Effectiveness of Incentives and Follow-Up on Increasing Survey Response Rates and Participation in Field Studies
    Smith, Michael G ;
    Witte, Maryam
    2019-12-01 | PDF
    Questionnaires are valuable data collection instruments in public health research, and can serve to pre-screen respondents for suitability in future studies. Survey non-response leads to reduced effective sample sizes and can decrease representativeness of the study population, so high response rates are needed to minimize the risk of bias. Here we ...
  • Innovative Methods for Delivering Fresh Foods to Underserved Populations
    Innovative Methods for Delivering Fresh Foods to Underserved Populations
    Shin, Hyeon-Shic
    ORCID ICON IMG
    2019-12-01 | PDF
    Limited access to fresh food sources—ones within reasonable distances with reliable, affordable transportation—has become a public health concern. The negative associations between a lack of fresh food consumption and health are well known. Because certain demographic groups are disproportionately affected by the absence of stores selling healthy a ...
  • Integrating Spatial Safety Data Into Transportation Planning Processes
    Integrating Spatial Safety Data Into Transportation Planning Processes
    Cherry, Christopher R. ;
    Hezaveh, Amin M
    2019-12-01 | PDF
    Travel demand models enable us to forecast the state of the transportation system under different scenarios such as changes to demand, transportation infrastructure and policies. By using a wide array of performance measures, planners can evaluate scenarios and compare their performance including but not limited to regarding cost, mobility, and emi ...
  • User Perceptions of Safety and Security A Framework for a Transition to ElectricSharedAutomated Vehicles
    User Perceptions of Safety and Security: A Framework for a Transition to Electric-Shared-Automated Vehicles
    Kurani, Kenneth S.
    ORCID ICON IMG
    2019-12-01 | PDF
    The confluence of vehicle electrification, sharing and pooling, and automation alters petroleum-fueled, human-piloted, and privately-owned and operated vehicles for personal mobility in ways that raises such questions as, "Are such systems safe and secure?" and, "Who is being kept safe and secure from what (or whom)?" Answers are implied by filling ...
  • Unmanned Aircraft Systems UAS Impact on Operational Efficiency and Connectivity
    Unmanned Aircraft Systems (UAS) Impact on Operational Efficiency and Connectivity
    Burgett, Joseph M ;
    Bausman, Dennis
    2019-12-01 | PDF
    Over the last several years, the use of unmanned aircraft systems (UAS), commonly referred to as drones, has increased significantly. This report outlines the findings of a study to explore the benefits of UAS technology when deployed at the SCDOT, specifically focused on the areas of land surveying and bridge inspection. The results of a drone-bas ...
  • LongTerm Performance Evaluation of NUDECK in Kearney East Bypass
    Long-Term Performance Evaluation of NUDECK in Kearney East Bypass
    Morcous, George ;
    Maguire, Marc
    2019-12-01 | PDF
    The Kearney East Bypass bridge is the first project that implements the newly developed precast concrete deck system (known as 2nd generation NUDECK). The new system consists of full-depth full-width precast prestressed concrete deck panels that are 12 ft (3.66 m) long each. The panels have covered shear pockets at 4 ft (1.22 m) spacing on each gir ...
  • Swelling Characterization of Natural and Chemically Stabilized Clays using Centrifuge Technology
    Swelling Characterization of Natural and Chemically Stabilized Clays using Centrifuge Technology
    Blake, Calvin ;
    Summerlin, Karly
    2019-12-01 | PDF
    Expansive clays, which are common throughout Texas, may cause severe damage to pavements and other lightweight structures. Methods of direct quantification of soil swelling potential may be time-consuming, while indirect methods based on correlations to soil index parameters (e.g., plasticity and grain size distribution) rely on relatively scant em ...
  • Development of HighPerformance Rapid Patching Materials for Pavement Repair
    Development of High-Performance Rapid Patching Materials for Pavement Repair
    Gholami, Shayan ;
    Hu, Jiong
    2019-12-01 | PDF
    Concrete pavements exhibiting severe distresses which require patching are commonly observed in the concrete pavement in Nebraska. Due to the requirements of opening pavement to traffic after placing the rapid patching materials, it is essential for that concrete to achieve high early strength. To ensure this, a high cement content and chloride-bas ...
  • Standardized Performance Evaluation of Vehicles with Automated Capabilities
    Standardized Performance Evaluation of Vehicles with Automated Capabilities
    Basantis, Alexis ;
    Harwood, Leslie
    2019-12-01 | PDF
    Advanced driver-assistance systems (ADAS) are becoming widely available in the new vehicle landscape, increasing of both vehicle occupants’ and other road users’ safety. In some vehicles, longitudinal and lateral positioning under certain conditions can be maintained, designating them as having either SAE level 1 (L1) or level 2 (L2) automated feat ...
  • Streamflow Measurement at TxDOT Bridges Final Report
    Streamflow Measurement at TxDOT Bridges: Final Report
    Maidment, David ;
    Evans, Harry
    2019-12-01 | PDF
    A transect of 20 radar streamflow gages has been installed on TxDOT bridges located on or near Interstate Highway 10, with gages located from west of San Antonio to the Louisiana border. The highest concentration of gages is east of Houston where I-10 is particularly flood prone. A cloud-based big data system is used to combine streamflow data from ...
  • Updating the Texas Rainfall Coefficients and Enhancing the EBDLKUP Tool Technical Report
    Updating the Texas Rainfall Coefficients and Enhancing the EBDLKUP Tool: Technical Report
    Birt, Andrew ;
    Gu, Chaoyi
    2019-12-01 | PDF
    Currently, the Texas Department of Transportation (TxDOT) uses EBDLKUP-2015-V2.xls to estimate location-specific storm intensities for hydraulic design. This tool is based on storm frequency and duration data analyzed and summarized between 1998 and 2004. In 2019, the National Oceanic and Atmospheric Administration Atlas14 project released the resu ...
  • Identification of WildlifeVehicle Conflict Hotspots in Utah
    Identification of Wildlife-Vehicle Conflict Hotspots in Utah
    Cramer, Patricia ;
    Vasquez, Emanuel
    2019-12-01 | PDF
    The Utah Department of Transportation (UDOT) and the Utah Division of Wildlife Resources (UDWR) work together to help reduce wildlife-vehicle collisions and improve the permeability of roads for wildlife. These efforts work largely at the UDOT and UDWR regional levels, yet there is a need to identify locations for top state-wide efforts. This resea ...
  • The Application of Unmanned Aerial Systems In Surface Transportation Volume IIB Assessment of Roadway Pavement Condition with UAS
    The Application of Unmanned Aerial Systems In Surface Transportation - Volume II-B: Assessment of Roadway Pavement Condition with UAS
    Mogawer, Walaa S. ;
    Xie, Yuanchang
    2019-12-01 | PDF
    The purpose of this study was to conduct a literature review of existing studies related to pavement condition analysis using Unmanned Aerial Systems (UAS) and conduct a pilot study to evaluate the applicability of using UAS for pavement condition analysis. Each task was undertaken by a different UMass research team. The literature review conducted ...
  • Development of a Virtual Weigh Station for Monitoring Overweight Vehicles on Secondary Routes
    Development of a Virtual Weigh Station for Monitoring Overweight Vehicles on Secondary Routes
    Webb, Davin
    2019-12-01 | PDF
    The problem of weigh station avoidance by heavy trucks exists throughout the United States. In Arkansas, alternate highways exist near every weigh station and are being used by some trucks to bypass without inspections. Although these trucks can be intercepted by roving Arkansas Highway Police (AHP) units, the ability to detect where this problem m ...
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