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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 4021 - 4040 of 36011 results
  • Bridge Deck Inspection Using Small Unmanned Aircraft Systems Based Airborne Imaging Techniques
    Bridge Deck Inspection Using Small Unmanned Aircraft Systems Based Airborne Imaging Techniques
    Zhang, Su ;
    Baros, Shirley V
    2020-12-01 | PDF
    As one of critical components of a transportation infrastructure system, bridges are very important to a country’s economy because they provide passage over physical obstacles to substantially reduce travel time and travel cost. Similar to other types of transportation infrastructure, bridges deteriorate over time. Therefore, bridges should be rout ...
  • Synthesis on Documentation and Tracking Research Implementation
    Synthesis on Documentation and Tracking Research Implementation
    Sadek, Husam ;
    Hassan, Marwa
    2020-12-01 | PDF
    In general, research funding departs from short-term objectives if the research results are not implementable. Planned and documented technology transfer efforts work to incorporate research findings and evidence-based interventions into real life. However, many research studies in different areas and fields were completed successfully without a re ...
  • Effects of Charging Infrastructure Characteristics on Electric Vehicle Preferences of New and Used Car Buyers in the United States
    Effects of Charging Infrastructure Characteristics on Electric Vehicle Preferences of New and Used Car Buyers in the United States
    Zou, Tianqi ;
    Khaloei, Moein
    2020-12-01 | PDF
    The used car market is a critical element for the mass adoption of electric vehicles (EVs). However, most previous studies on EV adoption have focused only on new car markets. This article examines and compares the effects of charging infrastructure characteristics on the preferences for EVs among both new and used car buyers. This study is based o ...
  • Minimum Time to Situational Awareness During Transfer of Control Under Varying Levels of Task Load
    Minimum Time to Situational Awareness During Transfer of Control Under Varying Levels of Task Load
    Knodler, Michael A. ;
    Fitzpatrick, Cole D.
    2020-12-01 | PDF
    Technology advancements in the past two decades have made the human-vehicle connection stronger than ever. Since 2009 there has been a boom in the development of autonomous vehicles (AVs) as an increasing number of manufacturers have begun to see immense potential in this area of artificial intelligence (AI). While the private sector is racing forw ...
  • MASH Test 412 of Shallow Anchorage Single Slope Traffic Rail SSTR
    MASH Test 4-12 of Shallow Anchorage Single Slope Traffic Rail (SSTR)
    Moran, Sana M ;
    Bligh, Roger P.
    2020-12-01 | PDF
    The purpose of the tests reported herein was to assess the performance of the Texas Department of Transportation’s (TxDOT’s) shallow anchorage single slope traffic rail (SSTR) according to the safety-performance evaluation guidelines included in the American Association of State Highway and Transportation Officials (AASHTO) Manual for Assessing Saf ...
  • Development of Structurally Independent Foundations for 36inch Tall Single Slope Traffic Rail SSTR for MASH TL4
    Development of Structurally Independent Foundations for 36-inch Tall Single Slope Traffic Rail (SSTR) for MASH TL-4
    Sheikh, Nauman M. ;
    Bligh, Roger P.
    2020-12-01 | PDF
    The objective of this project was to develop structurally independent foundations for TxDOT’s 36-inch tall single slope traffic rail (SSTR). The barrier and foundation systems were required to meet AASHTO MASH Test Level 4 (TL-4) criteria, and require minimal maintenance after a design impact. Foundation designs were needed for two common field ins ...
  • Insitu Evaluation of Design Parameters and Procedures for Cementitiously Treated Weak Subgrades using Cyclic Plate Load Tests
    In-situ Evaluation of Design Parameters and Procedures for Cementitiously Treated Weak Subgrades using Cyclic Plate Load Tests
    Abu-Farsakh, Murad ;
    Ardah, Allam
    2020-12-01 | PDF
    This study aimed at evaluating the performance-related properties (e.g., resilient modulus and permanent deformation) of cementitious treated/stabilized subgrade soils under repeated loading test conditions. For this purpose, both laboratory and field testing programs were performed on treated/stabilized specimens/test sections. The laboratory test ...
  • Frost Susceptibility and Strength of CementTreated FineGrained Soils
    Frost Susceptibility and Strength of Cement-Treated Fine-Grained Soils
    Bray, Matthew T ;
    Darrow, Margaret M.
    2020-12-01 | PDF
    Cement treatment is one way to improve the strength and stability of embankment materials when high-quality aggregate is not available. Concerns with using cement-treated fine-grained soils are potential frost susceptibility and subsequent thaw weakening. Previous research on this topic suggests that cement treatments of 3% to 4% are generally suff ...
  • Use of JBand To Improve the Performance of the HMA Longitudinal Joint
    Use of J-Band To Improve the Performance of the HMA Longitudinal Joint
    Williams, R. Christopher ;
    Podolsky, Joseph
    2020-12-01 | PDF
    The density and air void content of asphalt mixtures affect the durability and performance of asphalt pavements. Pavement longitudinal joints typically have a lower density than the mat because they receive less compaction than the center section of the mat for various reasons. The higher air void percentages resulting from lower densities can lead ...
  • Hybrid Prestressed Concrete Bridge Girders using UltraHigh Performance Concrete
    Hybrid Prestressed Concrete Bridge Girders using Ultra-High Performance Concrete
    Torres, Eduardo ;
    Hamilton, H. R.
    2020-12-01 | PDF
    In prestressed bridge girders, end region reinforcement and strand debonding are used to control cracking caused by high tensile stresses that occur due to prestress transfer. In some cases, these measures do not effectively control cracking, resulting in construction delays, potential repairs, additional costs, and potential compromise of long-ter ...
  • Holistic Networklevel Assessment of Pavement Flood Damages
    Holistic Network-level Assessment of Pavement Flood Damages
    Lee, Yong-Cheol ;
    Choi, Kunhee
    2020-12-01 | PDF
    After recent catastrophic flood disasters in Louisiana in 2016 and Texas in 2017, roadways in Region 6 areas suffer not only from the flood-inundation, but also from the long-term recovery processes that incur enormous maintenance costs. To assess the impacts of flooding disasters on roadways, various studies have investigated sampled roadway damag ...
  • Intersection on Horizontal Curves Problems and Potential Solutions
    Intersection on Horizontal Curves: Problems and Potential Solutions
    Sun, Xiaoduan ;
    Sun, Ming
    2020-12-01 | PDF
    Horizontal curves and intersections pose challenges to drivers and other roadway users because of their unique design and function, which is why both features have been recognized as the target areas for safety improvement in many states’ highway safety strategies. There is little research on assessing safety of intersections on horizontal curves. ...
  • Development of a Statewide Landslide Inventory Database for Idaho
    Development of a Statewide Landslide Inventory Database for Idaho
    Lifton, Zachery M ;
    Ducar, Scott D
    2020-12-01 | PDF
    Landslide inventory databases are fundamental tools for documenting and assessing slope stability hazards. They are often used by emergency managers and government agencies to catalog the location and contributing factors of landslides, and to prioritize mitigation efforts. Prior to this project, Idaho did not have a comprehensive, public landslide ...
  • RAP Reset Responsibly Optimizing Recycled Materials Use in AC and Pavement Performance Life
    RAP Reset – Responsibly Optimizing Recycled Materials Use in AC and Pavement Performance Life
    Hand, Adam J. T. ;
    Muench, Stephen T.
    2020-12-01 | PDF
    The durability performance of Asphalt Concrete (AC) with various percentages of Reclaimed Asphalt Material (RAM) has been a focal point of the asphalt industry leading it to embrace the Balanced Mix Design (BMD) concept. The goal of this research was to review and enhance Washington State Department of Transportation (WSDOT) AC materials selection, ...
  • Modeling EHailing and CarPooling Services in a Coupled Morning Evening Commute Framework
    Modeling E-Hailing and Car-Pooling Services in a Coupled Morning- Evening Commute Framework
    Pang, Jong-Shi ;
    Zhang, Michael
    2020-12-01 | PDF
    In this research project, we develop a general equilibrium model to capture the complex interactions between solo-driving, rideshare and e-hailing that allows travelers to switch between different transportation modes in a coupled morning-evening commute. The model is formulated as a mixed complementarity problem. The existence of an equilibrium so ...
  • Demonstration and InterComparison of Seasonal Weight Restriction Models Phase II
    Demonstration and Inter-Comparison of Seasonal Weight Restriction Models - Phase II
    Miller, Heather ;
    Berg, Richard L
    2020-12-01 | PDF
    Many miles of roads are in seasonal frost areas that are highly susceptible to damage during the spring thaw period. As freezing occurs from the surface downward, moisture is drawn toward the freezing front, ice lenses are formed, and the roadways become stronger. When the ice lenses (above still-frozen underlying layers) melt, the structure is lef ...
  • Urban Connector Year 3 Field Tests
    Urban Connector Year 3: Field Tests
    Cheu, Ruey Long ;
    Chow, Joseph
    2020-12-01 | PDF
    C2SMART has supported researchers at The University of Texas at El Paso (UTEP) in collaboration with researchers at New York University (NYU), and with the engagement of the City of El Paso’s Parks & Recreation Department for the development of an Android-based smartphone application named Urban Connector (UC), from March 2017 to February 2019. The ...
  • Evaluating Louisiana New Continuity Detail for Girder Bridges
    Evaluating Louisiana New Continuity Detail for Girder Bridges
    Okeil, Ayman M. ;
    Canales, Marco
    2020-12-01 | PDF
    This report summarizes results from an investigation of the behavior of link slabs as a means for achieving partial bridge continuity. Data collected over a period of three years from a structural health monitoring system installed in the Ouachita River Bridge was used to study link slab behavior. Multiple spans with various continuity details and ...
  • Appendices Clear Roads Project 1803 Evaluation of SSI and WSI Variables
    Appendices: Clear Roads Project 18-03 Evaluation of SSI and WSI Variables
    Sturges, Leigh ;
    Fay, Laura
    2020-12-01 | PDF
    The appendices for Clear Roads report CR18-03, Evaluation of SSI and WSI Variables," published December 2020.
  • Toward a Guide for Smart Mobility Corridors Frameworks and Tools for Measuring Understanding and Realizing Transportation Land Use Coordination
    Toward a Guide for Smart Mobility Corridors: Frameworks and Tools for Measuring, Understanding, and Realizing Transportation Land Use Coordination
    Appleyard, Bruce S. ;
    Stanton, Jonathan
    2020-12-01 | PDF
    The coordination of transportation and land use (also known as “smart growth”) has been a long-standing goal for planning and engineering professionals, but to this day it remains an elusive concept to realize. Leaving us with this central question -- how can we best achieve transportation and land use coordination at the corridor level? In respons ...
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