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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 3001 - 3020 of 35959 results
  • Assessing Axial Capacities of Auger Cast Piles from Measuring While Drilling
    Assessing Axial Capacities of Auger Cast Piles from Measuring While Drilling
    Rodgers, Michael ;
    McVay, Michael
    2021-12-01 | PDF
    This report focuses on the development of measuring while drilling (MWD) QA/QC procedures for South Florida auger cast-in-place (ACIP) piles, socketed into Florida limestone. The research first involved developing two MWD ACIP pile analysis spreadsheets that were used for QA/QC purposes during the installation of ACIP piles in South Florida. The fi ...
  • A Modal Comparison of Domestic Freight Transportation Effects on The General Public 20012019
    A Modal Comparison of Domestic Freight Transportation Effects on The General Public: 2001–2019
    Kruse, C James ;
    Farzaneh, Reza
    2021-12-01 | PDF
    This report updates the previous modal comparison study released by the Texas A&M Transportation Institute (TTI) in January 2017. That study used data from 2001–2014. This study includes data from 2001–2019 (2019 is the most recent year for which data are generally available for all three modes). Inland waterway traffic continues to compare favorab ...
  • Undrained Shear Strength of Plastic Silt Subject to BlastInduced Excess Pore Pressures
    Undrained Shear Strength of Plastic Silt Subject to Blast-Induced Excess Pore Pressures
    Stuedlein, Armin W. ;
    Jana, Amalesh
    2021-12-01 | PDF
    This research report evaluates the undrained shear strength of plastic silts soils subject to raised excess pore pressures such as those resulting from strong ground motion. The knowledge of the possible reduction in undrained shear strength of soils is useful for planning and executing construction of transportation infrastructure subject to earth ...
  • Implementation of Unmanned Aerial Systems Using CloseRange Photogrammetry Techniques UASCRP for Quantitative Metric and Qualitative Inspection Tasks Related to Roadway Assets and Infrastructures Final Report
    Implementation of Unmanned Aerial Systems Using Close-Range Photogrammetry Techniques (UAS-CRP) for Quantitative (Metric) and Qualitative (Inspection) Tasks Related to Roadway Assets and Infrastructures: Final Report
    Puppala, Anand J. ;
    Congress, Surya S C
    2021-12-01 | PDF
    The primary purpose of this implementation project is to educate and inform TxDOT staff on FAA rules and regulations and TxDOT policy governing the use of UAS for TxDOT projects. The TxDOT Unmanned Aircraft System (UAS) Flight Operations and User's Manual (FOM), developed as part of the preceding research and highlights of the preceding research we ...
  • Examination of Key Transportation Funding Programs in California and Their Context
    Examination of Key Transportation Funding Programs in California and Their Context
    Gahbauer, John ;
    Matute, Juan
    2021-12-01 | PDF
    The UC team carried out its work based on 1) reviewing and analyzing previous research on the topic, including government reports, assessment document, and scholarly literature; 2) discussions with SGC staff and the staff of state agencies involved in transportation planning and related activities in California; and 3) interviews with key informant ...
  • Ohios Research Initiative for Locals ORIL Research OnCall Task 1 Tree Canopy
    Ohio’s Research Initiative for Locals (ORIL) Research On-Call Task 1 – Tree Canopy
    Khoury, Issam ;
    Garcia-Ruiz, Johnnatan
    2021-12-01 | PDF
    Premature deterioration of asphalt pavement has been observed in shaded areas, such as those under tree canopies or near tall buildings or hills. The shade slows or prevents drying of the pavement surface after rain or snow, and the prolonged presence of moisture leads to premature or increased stripping of the asphalt. One frequently used remedy i ...
  • Effectiveness of Mechanical Treatment of CrackArrest Holes Subject to DistortionInduced Fatigue
    Effectiveness of Mechanical Treatment of Crack-Arrest Holes Subject to Distortion-Induced Fatigue
    Bridwell, Luke ;
    Bennett, Caroline
    2021-12-01 | PDF
    This report details a study that was aimed at assessing the effectiveness of mechanically treating crack-arrest holes used at the tips of distortion-induced fatigue cracks. Different mechanisms are possible for producing expansion of crack-arrest holes drilled at the tips of fatigue cracks, and such treatments have shown to be effective in improvin ...
  • Road Condition Detection and Classification From Existing CCTV Feed
    Road Condition Detection and Classification From Existing CCTV Feed
    Chen, Stanley ;
    Chen, Yaobin
    2021-12-01 | PDF
    The Indiana Department of Transportation (INDOT) has approximately 500 digital cameras along highways in populated areas of Indiana. These cameras are used to monitor traffic conditions around the clock, all year round. Currently, the videos from these cameras are observed one-by-one by human operators looking for traffic conditions and incidents. ...
  • CostEffective Detection and Repair of Moisture Damage in Pavements
    Cost-Effective Detection and Repair of Moisture Damage in Pavements
    Elseifi, Mostafa A. ;
    Dhakal, Nirmal
    2021-12-01 | PDF
    The major objective of this study was to evaluate the use of non-destructive evaluation (NDE) test methods to identify moisture damage in the field, to classify surface cracking in flexible pavements as top-down or bottom-up cracking, and to predict roughness conditions from surface images. NDE test methods evaluated in this study included Traffic ...
  • Analytical and Testing Methods for Rating Longitudinal Laminated Timber Slab Bridges
    Analytical and Testing Methods for Rating Longitudinal Laminated Timber Slab Bridges
    Dahlberg, Justin ;
    Liu, Zhengyu
    2021-12-01 | PDF
    The Wisconsin Department of Transportation recognizes the importance of accurately assessing the timber deck slab bridge inventory within the state. Of the 571 timber bridges in Wisconsin, 450 bridges are timber slab bridges. Current methods of load rating employ equations first developed in the later 1980s and early 1990s for determining the equiv ...
  • Safety and Illumination of Rural and Suburban Roundabouts Phase II
    Safety and Illumination of Rural and Suburban Roundabouts (Phase II)
    Rodgers, Michael O. ;
    Gbologa, Franklin
    2021-12-01 | PDF
    This project focused on establishing the relationship between the presence/absence or levels of illumination and other geometric and traffic characteristics on nighttime safety at rural and suburban roundabouts. Eighty roundabouts from thirty-seven counties across Georgia were selected to provide a wide range of conditions in terms of illumination ...
  • ConnectedAutonomous Traffic Signal Control Algorithms for Trucks and Fleet Vehicles
    Connected-Autonomous Traffic Signal Control Algorithms for Trucks and Fleet Vehicles
    Zlatkovic, Milan ;
    Ahmed, Mohamed M
    2021-12-01 | PDF
    Connected and Autonomous Vehicle (CAV) technologies enable communication among vehicles, and vehicles and infrastructure, paving the way for multiple safety and operational applications. This research developed and tested traffic signal control algorithms and control programs which utilized CAV-equipped heavy trucks and traffic signals. The focus o ...
  • Eastern Colorado CrestStage Network 2018 through 2020 Research Brief
    Eastern Colorado Crest-Stage Network, 2018 through 2020: [Research Brief]
    Kohn, Michael S. ;
    Gross, Alfred
    2021-12-01 | PDF
    The objective of this study was to collect peak-streamflow data at the 10 sites in eastern Colorado identified in figure 1 using crest-stage gages for water years (October 1 to September 20) 2018-2020. The scope of this effort for each site each year includes survey levels, water level data collection, data entry, streamgage records, publication of ...
  • Research on HighRAP Mixtures with RejuvenatorField Implementation
    Research on High-RAP Mixtures with Rejuvenator-Field Implementation
    Bastola, Nitish R ;
    Khedmati, Mahdieh
    2021-12-01 | PDF
    The use of Rejuvenating Agents (RAs), as Recycled Asphalt Pavement (RAP) modifiers, has been increasing over the past years. However, the field performance of asphalt mixtures containing high-RAP materials and modified with RAs has raised some concerns regarding the long-term performance of RAs. This study evaluated the laboratory and field perform ...
  • Cost of Congestion Due to Incidents on Freeways
    Cost of Congestion Due to Incidents on Freeways
    Lan, Chien-Lun ;
    Zhao, Mo
    2021-12-01 | PDF
    When alternative incident management strategies are evaluated, there is often a need to convert reductions in incident clearance time to a monetary cost saving. In the past, the Virginia Department of Transportation (VDOT) has used unit delay costs from other agencies to estimate incident congestion costs and the benefit of incident management prog ...
  • Evaluation of Hybrid Micropile AFrameGeosyntheticReinforced Wall with Steel Guardrail Barrier for MASH Loading
    Evaluation of Hybrid Micropile A-Frame-Geosynthetic-Reinforced Wall with Steel Guardrail Barrier for MASH Loading
    Pak, Ronald Y S ;
    Zhang, Zhichao
    2021-12-01 | PDF
    This report presents the result of the evaluation of the adequacy and ability of a hybrid geosynthetic reinforced retaining wall in a truncated configuration for steep terrains to support steel bridge guardrails under the American Association of State Highway and Transportation Officials (AASHTO) Manual for Assessing Safety Hardware (MASH)’s Test-L ...
  • What Happened and Will Happen With Biofuels Review and Prospects for NonConventional Biofuels in California and the US Supply Cost and Potential GHG Reductions
    What Happened and Will Happen With Biofuels? Review and Prospects for Non-Conventional Biofuels in California and the U.S.: Supply, Cost, and Potential GHG Reductions
    Witcover, Julie
    ORCID ICON IMG
    2021-12-01 | PDF
    This paper examines past and future trends for non-conventional biofuels in transportation in the next decade and beyond in California and the U.S., drawing on existing literature. It finds policy was geared toward expanding use of technology-ready biofuels in the 2010s; hydro-processed renewable diesel from lipid feedstocks and biogas were benefic ...
  • CIV Civil Infrastructure Vision v10 Bridge Calibration User Manual and Validation Manual
    CIV - Civil Infrastructure Vision© v1.0: Bridge Calibration User Manual and Validation Manual
    Ghannoum, Wassim M ;
    Diaz, Manuel A.
    2021-12-01 | PDF
    An integrated software/hardware system was developed that can be used to monitor surface deformations on structural components ranging from small-scale material-test coupons, to full-scale bridge members. The system delivered to the Texas Department of transportation is dubbed the Civil Infrastructure Vision (CIV) System and is intended to measure ...
  • Taxation of RideHailing
    Taxation of Ride-Hailing
    Lehe, Lewis ;
    Devunuri, Saipraneeth
    2021-12-01 | PDF
    This report is a guide to the practice of taxing ride-hailing at the state and local levels in the United States. The information is based on a survey of legislation, news articles, journal articles, revenue data, and interviews. We first review the literature and provide a history of ride-hailing and the practice of ride-hailing. We then profile a ...
  • Louisianas AlcoholImpaired Driving Problem An Analysis of Crash and Cultural Factors
    Louisiana’s Alcohol-Impaired Driving Problem: An Analysis of Crash and Cultural Factors
    Shipp, Eva ;
    Das, Subasish
    2021-12-01 | PDF
    Though national trends regarding culture and drinking are well documented, behaviors specific to Louisiana’s diverse cultural makeup are not. This analysis addresses this need. A review of the research literature identified cultural groups and how those different groups approach age of first consumption, consistent alcohol usage, and binge drinking ...
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