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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 5481 - 5500 of 36958 results
  • Field Implementation of HighVolume Recycled Materials for Sustainable Pavement Construction
    Field Implementation of High-Volume Recycled Materials for Sustainable Pavement Construction
    Khayat, Kamal H. ;
    Sadati, Seyedhamed
    2020-01-01 | PDF
    The objective of this study was to evaluate the feasibility of producing sustainable concrete materials for rigidpavement construction using high volume of recycled materials. The goal was to replace 50% of all solid materials inthe concrete with recycled materials and industrial by-products. This included the replacement of cement with at least50% ...
  • The Opportunity Cost of Parking Requirements Would Silicon Valley Be Richer if Its Parking Requirements Were Lower
    The Opportunity Cost of Parking Requirements: Would Silicon Valley Be Richer if Its Parking Requirements Were Lower?
    Gabbe, C J ;
    Manville, Michael
    2020-01-01 | PDF
    We estimated the off-street parking supply of the seven most economically productive cities in Santa Clara County, California, better known as Silicon Valley. Using assessor data, municipal zoning data, and visual inspection with aerial imagery, we estimated that about 14 percent of the land area in these cities is devoted to parking, and that over ...
  • Infrastructure Inspection During and After Unexpected Events Phase II
    Infrastructure Inspection During and After Unexpected Events – Phase II
    Rahmatalla, Salam ;
    Markfort, Corey
    2020-01-01 | PDF
    This report presents the development of a finite element (FE) model updating scheme of a highway bridge. In this process, the FE model, based on the original drawing of the bridge, generates a numerical data set that is used to build regression surfaces between the models’ parameters and the model’s response represented by the natural frequencies a ...
  • Incorporating Economic Resilience Metrics Into INDOTs Transportation DecisionMaking
    Incorporating Economic Resilience Metrics Into INDOT’s Transportation Decision-Making
    Ke, Yue ;
    Rojas, Lisa Lorena Losada
    2020-01-01 | PDF
    The 2007 Great Recession is widely considered the worst economic downturn in recent United States History. In Indiana, the unemployment rate reached 10.6%, and took nearly seven years to return to pre-recession levels. However, employment data from this period shows that the change in total employment at the county level ranged from -20% to +5%, in ...
  • Do PolyepoxyPolyisocyanate Composite Resins for Concrete Protection Perform Better Than Either of Their Components
    Do Polyepoxy/Polyisocyanate Composite Resins for Concrete Protection Perform Better Than Either of Their Components?
    Bossmann, Stefan H. ;
    Kalubowilage, Madumali
    2020-01-01 | PDF
    Polyepoxy and polyisocyanate resins are currently in use for protecting concrete and especially steel structural elements in concrete from water-induced corrosive processes. The newest class of materials consists of polyepoxy/polyisocyanate composite resins. The underlying paradigm of using these composite materials is that they show structural syn ...
  • WisDOT Research Program 2020 Annual Report
    WisDOT Research Program: 2020 Annual Report
    Wisconsin. Department of Transportation
    2020-01-01 | PDF
    This is a report of research and technology transfer activities carried out by the Wisconsin Department of Transportation through the Part B research portion of the State Planning and Research Program of the Federal Highway Administration, U.S. Department of Transportation. The report describes activities during Federal Fiscal Year 2020, covering O ...
  • Best Practices for Effectively Training Research Staff Research Peer Exchange Report November 1619 2020
    Best Practices for Effectively Training Research Staff: Research Peer Exchange Report November 16-19, 2020
    Georgia. Department of Transportation. Office of Performance-Based Management & Research
    2020-01-01 | PDF
    This Georgia Department of Transportation (GDOT) virtual peer exchange was conducted around the topic of research staff training and skillsets. This report highlights the objectives of the peer exchange, the participating panelists, and individual agencies’ program overview and training practices, and key takeaways from each. An analysis of the tra ...
  • Fuels and Fuel Technologies for Powering 21st Century Passenger and Freight Rail SimulationBased Case Studies in a US Context
    Fuels and Fuel Technologies for Powering 21st Century Passenger and Freight Rail: Simulation-Based Case Studies in a U.S. Context
    Isaac, Raphael S
    2020-01-01 | PDF
    The last century brought a shift in rail propulsion from the (typically) coal-powered steam engine to a combination of the diesel-electric locomotive and the electrified locomotive running under electrified overhead lines. While, no doubt, an advance over the earlier technology, the two incumbent technologies are not without their shortcomings. In ...
  • Assessment of Environmental Seasonal and Regional Variations in Pavement Base and Subgrade Properties
    Assessment of Environmental, Seasonal, and Regional Variations in Pavement Base and Subgrade Properties
    Gaspard, Kevin ;
    Zhang, Zhongjie
    2020-01-01 | PDF
    LTRC has conducted an extensive research project to determine the seasonal variation in the subgrade MR from 14 sites throughout Louisiana. The study (1) conducted FWD testing on the 14 sites seasonal for a period of at least 3 years; (2) developed an online web application to determine the soil types throughout Louisiana based upon NCHRP soil unit ...
  • Continuous Friction Measurement Equipment CFME for Highway Safety Management in Oklahoma
    Continuous Friction Measurement Equipment (CFME) for Highway Safety Management in Oklahoma
    Li, Joshua Q. ;
    Wang, Kelvin
    2020-01-01 | PDF
    An important part of the pavement friction management (PFM) process is the selection of the most appropriate friction measuring equipment. In this project, the capabilities of the Grip Tester, a type of continuous friction measurement (CFME) device, and its ability to provide information to support PFM programs were evaluated based on comprehensive ...
  • Assessment of Hood Designs for Pedestrian Head Protection Active Hood Systems
    Assessment of Hood Designs for Pedestrian Head Protection: Active Hood Systems
    Suntay, Brian ;
    Stammen, Jason
    2020-01-01 | PDF
    Pedestrian impact testing of the U.S. vehicle fleet by the National Highway Traffic Safety Administration has provided snapshots of the performance of evolving technologies that protect a pedestrian’s head in head-to-hood impacts. One of the recent evolving technologies is the introduction of active hood systems that pop up upon contact with a pede ...
  • Instrumentation and Modeling of Geosynthetic Load Transfer Platform Performance Research Project Capsule
    Instrumentation and Modeling of Geosynthetic Load Transfer Platform Performance [Research Project Capsule]
    Abu-Farsakh, Murad Y. ;
    Rupnow, Tyson
    2020-01-01 | PDF
    The primary objectives of this research are to monitor the short-term (during the construction) and long-term behavior and performance of geosynthetic Load Transfer Platform (LTP) in the state of Louisiana; evaluate and verify (and maybe modify) important design factors and parameters for geosynthetic LTP: load distribution (between piles, geogrid, ...
  • An Empirical Bayes Approach to Quantifying the Impact of Transportation Network Companies TNCs on VMT
    An Empirical Bayes Approach to Quantifying the Impact of Transportation Network Companies (TNCs) on VMT
    Choi, Yunkyung ;
    Defoe, Daniel G
    2020-01-01 | PDF
    Assessing the impacts of new and disruptive technologies on automobile usage and the modal split is emerging as a key issue for transportation planners and policymakers. This study offers a new approach to quantifying the impact of transportation network companies (TNCs) such as Uber and Lyft on vehicle‐miles traveled (VMT). The approach is based o ...
  • Best Practice for Assessing Roadway Damages Caused by Flooding
    Best Practice for Assessing Roadway Damages Caused by Flooding
    Tao, Mingjiang ;
    Mallick, Rajib B
    2020-01-01 | PDF
    As a result of a changing climate that is believed to produce more frequent extreme events witnessed in the United States, thousands of roadway lane miles had been inundated in recent years during various storms and hurricanes. Flood-induced damage to roadways is well recognized and documented in both local and national media as well as in the lite ...
  • Evaluation of TieBar Anchoring Methods Nonshrink Grout vs Epoxy
    Evaluation of Tie-Bar Anchoring Methods: Non-shrink Grout vs. Epoxy
    Heyen, Wally ;
    Halsey, Lieska
    2020-01-01 | PDF
    NDOT materials engineers observed during pavement repairs (PR) that tie-bars placed with non-shrink grout exhibited poor strength when pulled M&R engineers launched an investigation into the strength of non-shrink grout and epoxy anchored tie-bars in PR projects. The purpose of this investigation was to verify whether or not non-shrink grout provid ...
  • Investigating Available StateoftheArt Technology for Determining Needed Information for Bridge Rating Strategies
    Investigating Available State-of-the-Art Technology for Determining Needed Information for Bridge Rating Strategies
    Karshenas, Afshin ;
    Naghavi, Babak
    2020-01-01 | PDF
    In this report, nondestructive test (NDT) methods are evaluated in the context of providing input parameters to perform bridge load rating calculations for different bridge types. Relevant NDT methods are identified based on diverse technologies including mechanical impact, acoustic, electromagnetic, electrical and chemical, cuclear, and miscellane ...
  • Develop System To Render MechanisticEmpirical Traffic Data for Pavement Design Workshop PPT Slides
    Develop System To Render Mechanistic-Empirical Traffic Data for Pavement Design: Workshop PPT Slides
    Walubita, Lubinda F. ;
    Lee, Sang Ick
    2020-01-01 | PDF
    This workshop PPT slides demonstrate the key findings of Texas Department of Transportation (TxDOT) Project 0-6940 Develop System to Render Mechanistic-Empirical Traffic Data for Pavement Design. It can be used as an instructor guide to provide in-depth understanding of site-specific ME-compatible traffic data for pavement design.
  • US Biofuel Production and Policy Implications for Land Use Changes in Malaysia and Indonesia
    US Biofuel Production and Policy: Implications for Land Use Changes in Malaysia and Indonesia
    Taheripour, Farzad ;
    Tyner, Wallace E.
    2020-01-01 | PDF
    It has been argued that the US biofuel policy is responsible for the land use changes in Malaysia and Indonesia (M&I). In this paper, following a short literature review that highlights the relevant topics and issues, we develop analytical and numerical analyses to evaluate the extent to which production of biofuels in the US alters land use in M&I ...
  • Transit in Flex Examining Service Fragmentation of New AppBased OnDemand Transit Services
    Transit in Flex: Examining Service Fragmentation of New App-Based, On-Demand Transit Services
    Weinreich, David ;
    Skuzinski, Thomas
    2020-01-01 | PDF
    The transportation industry may be going through its largest technological revolution in a century, with new forms of on-demand transportation capitalizing on innovations like the Global Positioning System (GPS) chips to develop app-based, on-demand transportation, connecting user and driver, known alternatively as ridesourcing, ride-hailing, Trans ...
  • Feasibility Study of GRS Systems for Bridge Abutments in Oklahoma Influence of Facing and Aggregate Fill on Performance
    Feasibility Study of GRS Systems for Bridge Abutments in Oklahoma: Influence of Facing and Aggregate Fill on Performance
    Hatami, Kianoosh ;
    Doger, Ridvan
    2020-01-01 | PDF
    This document reports a study where load-bearing capacity, deformations and construction speed of different GRS abutment models were compared in the laboratory at full scale. Six 8 ft-high, instrumented abutment models were constructed inside an outdoor test station in order to study the influences that the choice of facing type, reinforcement spac ...
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