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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 7381 - 7400 of 36114 results
  • Fatigue Resistant Design Criteria for MD SHA Cantilevered Mast Arm Signal Structure Research Summary
    Fatigue Resistant Design Criteria for MD SHA Cantilevered Mast Arm Signal Structure : Research Summary
    Fu, Chung C.
    2017-12-01 | PDF
    Over the past two decades, wind induced fatigue cracking of highway signs, luminaires, and traffic signal support structures have been increasingly reported all over the United States. While fatalities associated with these failures have been limited, the nuisance of dealing with a large number of fatigue cracks in the sheer volume of these structu ...
  • Research on Joint Sealant Materials to Improve Installation and Performance Final Report
    Research on Joint Sealant Materials to Improve Installation and Performance : Final Report
    Choi, Pangil ;
    Senadheera, Sanjaya
    2017-12-01 | PDF
    The objectives of this project were to 1) identify failure modes and their mechanisms in joint seals in Texas, and to 2) identify what needs to be done to minimize the failures and improve joint seal performance. To achieve these objectives efficiently, a factorial experiment was developed that included pavement age, shoulder and base type and clim ...
  • Failure to Follow Written Procedures
    Failure to Follow Written Procedures
    Drury, Colin G. ;
    Drury Barnes, Catherine
    2017-12-01 | PDF
    Most tasks in aviation have a mandated written procedure to be followed specifically under the Code of Federal Regulations (CFR) Part 14, Section 43.13(a). However, the incidence of Failure to Follow Procedure (FFP) events continues to be a major issue in aviation maintenance. This report details the results of Phase 1 of a two phase effort. In Pha ...
  • Cloud Forming Potential of Aerosol from Lightduty Gasoline Direct Injection Vehicles
    Cloud Forming Potential of Aerosol from Light-duty Gasoline Direct Injection Vehicles
    Fofie. Emmanuel A. ;
    Karavalakis, Georgios
    2017-12-01 | PDF
    In this study, we evaluate the hygroscopicity and droplet kinetics of fresh and aged emissions from new generation gasoline direct injector engines retrofitted with a gasoline particulate filter (GPF). Furthermore, ageing and subsequent secondary aerosol formation is explored in (NH4)2SO4-seeded and non-seeded experiments. We explore the impacts on ...
  • Development of KeyEnabling Technologies for a Variableblend Natural Gas Vehicle
    Development of Key-Enabling Technologies for a Variable-blend Natural Gas Vehicle
    Park, Chan Seung ;
    Roy, Partho Sarothi
    2017-12-01 | PDF
    A portable, economic and reliable sensor for the Natural Gas (NG) fuel quality has been developed. Both Wobbe Index (WI) and Methane Indexes (MI) as well as inert gas content (inert%) of the NG fuel can be measured in real time within 5% accuracy. This sensor is targeting to be used in any equipment that involves NG combustion including NG vehicle, ...
  • Magnetic Tomography Assessing Tie Bar and Dowel Bar Placement Accuracy
    Magnetic Tomography - Assessing Tie Bar and Dowel Bar Placement Accuracy
    Hobson, Cliff
    2017-12-01 | PDF
    The Kansas Department of Transportation (KDOT) constructs portland cement concrete pavements (PCCP) for new highway expansions and/or for replacement of existing highway pavement using slip-form paving operations. Typical concrete pavement construction in Kansas requires reinforcing steel across the joints. Correct placement of reinforcing steel in ...
  • Reduction of Bridge Deck Cracking through Alternative Material Usage
    Reduction of Bridge Deck Cracking through Alternative Material Usage
    Patnaik, Anil
    2017-12-01 | PDF
    ODOT routinely deploys a large number of continuous span structural slab bridges. Despite being designed to strictly satisfy all the relevant AASHTO and ODOT BDM requirements, many such bridge decks show transverse cracks, with widths greater than those predicted using AASHTO 2012 and ACI 318-14 guidelines, after being in service for less than one ...
  • TDOT Access Management Report
    TDOT - Access Management Report
    Kohls, Airton G ;
    Ortmann, Mareike
    2017-12-01 | PDF
    This report serves as a source of guidelines to assist TDOT in its efforts to regulate access management in transportation projects throughout the State of Tennessee. The focus of this document is on recommended practices for access spacing and access design. A comprehensive review of TRB manuals, NCHRP reports, FHWA guidelines and State manuals il ...
  • Safety Edge Crash Modification Factors Tech Brief
    Safety Edge Crash Modification Factors [Tech Brief]
    Hallmark, Shauna L. ;
    Goswamy, Amrita
    2017-12-01 | PDF
    The Safety Edge is a relatively low-cost countermeasure that can be applied in both asphalt and concrete paving operations. The Safety Edge has been promoted as a low-cost countermeasure to reduce the frequency and severity of rural roadway departure crashes. However, there is little information about the actual effectiveness of the Safety Edge in ...
  • FY 2017 Oregon Transportation Needs and Issues Survey Summary of Statewide Results
    FY 2017 Oregon Transportation Needs and Issues Survey: Summary of Statewide Results
    Knudson, Tony
    2017-12-01 | PDF
    The Oregon Transportation Needs and Issues Survey was first conducted in 1993 and has been done roughly every two years. The latest survey was completed in Autumn 2016 (State fiscal year (FY) 2017). This report summarizes the results of the FY 2017 survey. For some reoccurring questions, results are also compared to past surveys.
  • Public Dialysis Transport Efficiency Using Digital Media
    Public Dialysis Transport Efficiency Using Digital Media
    Lind, Mary R. ;
    Hensley, Rhonda L.
    2017-12-01 | PDF
    The provision of para-transit services for patients needing dialysis is vital to patient maintenance. The availability of para-transit services varies in North Carolina counties depending on federal, state and local funding. Because these resources are limited, it is important to use available technologies to maximize resource usage. A survey was d ...
  • USA
    USA
    Huijser, Marcel P. ;
    Gunson, Kari E.
    2017-12-01 | PDF
    We evaluated the effectiveness of existing turtle fences through collecting and analyzing turtle mortality data along U.S. Hwy 83, in and around Valentine National Wildlife Refuge, Nebraska, USA. We also investigated the level of connectivity for turtles provided through the culverts that were originally designed to pass water through a capture-mar ...
  • Utilizing Lab Tests to Predict Asphalt Concrete Overlay Performance
    Utilizing Lab Tests to Predict Asphalt Concrete Overlay Performance
    Al-Qadi, Imad L. ;
    Lippert, David L.
    2017-12-01 | PDF
    A series of five experimental projects and three demonstration projects were constructed to better understand the performance of pavement overlays using various levels of asphalt binder replacement (ABR) from reclaimed asphalt pavement (RAP), recycled asphalt shingles (RAS), and crushed concrete. The ABR varied from 15% to 60% in the experimental s ...
  • Analysis of Freight Transport Strategies and Methodologies
    Analysis of Freight Transport Strategies and Methodologies
    Sakhrani, Vivek ;
    Ludlow, Donald
    2017-12-01 | PDF
    Transportation agencies are often blind to freight flows at the “last mile” level of truck movements. New strategies, data sources, and analytics have the potential to provide an empirical understanding of last mile truck movements and their impacts, without relying on commercially sensitive private sector data. This research project identifies bes ...
  • Use of Geothermal Energy for Deicing Approach Pavement Slabs and Bridge Decks Phase 1 Final Report
    Use of Geothermal Energy for Deicing Approach Pavement Slabs and Bridge Decks, Phase 1: Final Report
    Yu, Xinbao ;
    Puppala, Anand J.
    2017-12-01 | PDF
    Deicing using geothermal energy can provide TxDOT a better alternative than the existing method of using deicing with sands and/or salts. This research project will address this topic with a primary focus of comprehensive synthesis study. As a part of this synthesis, the available literature on geothermal energy along with success application case ...
  • Validation and Calibration of Finite Element Model of Forces in Wingwalls
    Validation and Calibration of Finite Element Model of Forces in Wingwalls
    Nusairat, Jamal ;
    Al-Zoubi, Nasser
    2017-12-01 | PDF
    The abutment of Bridge HAM-74-1466, located on I-74 in Hamilton County, Ohio was instrumented with KM-100 and vibrating wire strain gages and temperature sensors to measure strains and compute stresses in the abutment. These stresses were compared to those computed by finite element models of the abutment created using SAP 2000 v. 19 and ABACUS CAE ...
  • Literature Review of the Implications of Differential Speed Limit Implementation
    Literature Review of the Implications of Differential Speed Limit Implementation
    Davis, Haggai ;
    Gudishala, Ravindra
    2017-12-01 | PDF
    This report addresses the matter of differential and uniform speed limits and their application at the state level. It was prepared in response to a request in the 2017 session of the Louisiana House of Representatives where the Louisiana Department of Transportation and Development (DOTD) was asked to “study the safety and operational impacts of d ...
  • University of Florida Advanced Technologies Campus Testbed Summary
    University of Florida Advanced Technologies Campus Testbed [Summary]
    Dockstader, J. Darryll ;
    Elefteriadou, Lily
    2017-12-01 | PDF
    Connected vehicles (CV) and automated vehicles (AV) are the subjects of numerous projects around the world. CVs can communicate with a driver, other vehicles, roadside infrastructure, the Internet, or all of the above. These communications can assist with safety, navigation, traffic flow, and more. AVs can communicate like CVs, and have additional ...
  • ZeroEmission Transit Bus and Refueling Technologies and Deployment Status
    Zero-Emission Transit Bus and Refueling Technologies and Deployment Status
    Christofa, Eleni ;
    Pollitt, Krystal
    2017-12-01 | PDF
    The Massachusetts Global Warming Solutions Act and Executive Order 569 mandate greenhouse gas reductions. In addition, in 2014, Massachusetts joined seven other states in a Multi-State Zero-Emission Vehicle Action Plan to increase those vehicles and establish appropriate refueling infrastructure. One strategy to achieving this mandate is implementa ...
  • Base Stabilization Guidance and Additive Selection for Pavement Design and Rehabilitation
    Base Stabilization Guidance and Additive Selection for Pavement Design and Rehabilitation
    Wegman, Daniel E. ;
    Sabouri, Mohammadreza
    2017-12-01 | PDF
    Significant improvements have been made in base stabilization practice that include design specifications and methodology, experience with the selection of stabilizing additives, and equipment for distribution and uniform blending of additives. For the rehabilitation of existing pavements the stabilization of base material has delivered performance ...
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