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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 3461 - 3480 of 36151 results
  • Flash Tracking Implementation Guidelines Complementing Existing DesignBuild Manual
    Flash Tracking Implementation Guidelines Complementing Existing Design-Build Manual
    Pishdad-Bozorgi, Pardis ;
    de la Garza, Jesus M
    2021-08-01 | PDF
    The overarching objective of this research is to develop Flash Tracking implementation guidelines that would complement the existing Design-Build Manual. These standardized implementation guidelines are captured in an appendix to the Design-Build Manual. The research methodology comprised three phases. In the first phase, the research team studied ...
  • Development of FDOT SERF and RETA Design Equations for Coastal Scour When a Single Vertical Pile Is Subjected To Wave Attack
    Development of FDOT SERF and RETA Design Equations for Coastal Scour When a Single Vertical Pile Is Subjected To Wave Attack
    Crowley, Raphael
    2021-08-01 | PDF
    Computational fluid dynamic (CFD) modeling was used to simulate several piles under water wave attack. First, the CFD models were tested at small scale using meshes that were functions of wave geometry (i.e., wave height, wavelength, wave period) to verify that the models could accurately reproduce previously reported experimental data. Once verifi ...
  • Drainability of Base Aggregate and Sand
    Drainability of Base Aggregate and Sand
    Oh, Hyunjun ;
    Likos, William J.
    2021-08-01 | PDF
    Poor drainage of roadway base materials can lead to increased pore water pressure, reduction of strength and stiffness, and freeze-thaw damage. Drainability is dependent on soil/aggregate physical properties that affect water flow and retention in the porous matrix, notably including particle-size distribution, particle shape, fines content, and de ...
  • Guidelines for Implementing Super 2 Corridors in Texas
    Guidelines for Implementing Super 2 Corridors in Texas
    Brewer, Marcus A.
    2021-08-01 | PDF
    Multiple research projects on Super 2 passing lanes for rural two-lane highways have produced guidance for practitioners on the design and implementation of those passing lanes. In addition, guidance documents such as the Texas Department of Transportation Roadway Design Manual and the Texas Manual on Uniform Traffic Control Devices provide recomme ...
  • Innovative Contracting Best Practices
    Innovative Contracting Best Practices
    Chenault, David J ;
    Bale, John
    2021-08-01 | PDF
    The Michigan Department of Transportation (MDOT) has been using innovative contracting methods to deliver projects for several years. While these innovative delivery practices save time and reduce costs, the potential benefits of alternative delivery have not been fully realized. This research focuses on identifying best practices from owners acros ...
  • Simplified Cone Penetration Test PerformanceBased Assessment of Liquefaction and Effects Phase 1 Tasks 14
    Simplified Cone Penetration Test Performance-Based Assessment of Liquefaction and Effects: Phase 1, Tasks 1–4
    Franke, Kevin W ;
    Coutu, Tyler B
    2021-08-01 | PDF
    The purpose of the research presented is to provide the benefit of the full performance-based probabilistic earthquake hazard analysis using Cone Penetration Test (CPT) data, without requiring special software, training, and experience. To do this, simplified models of liquefaction triggering, post-liquefaction settlement, and lateral spread displa ...
  • Surveys of Transit Riders and Agencies During the COVID19 Pandemic
    Surveys of Transit Riders and Agencies During the COVID-19 Pandemic
    Molina, Antonio ;
    Malalgoda, Narendra
    2021-08-01 | PDF
    This study examines public opinion toward transit during the COVID-19 pandemic, changes in rider behavior, and responses by transit agencies. This was accomplished through two surveys. First, a survey of transit riders and the public was conducted to examine response to the pandemic. It focused on the use of public transit and strategies that trans ...
  • Methodology for Calibration and Validation of Mesoscopic Traffic Simulation Models
    Methodology for Calibration and Validation of Mesoscopic Traffic Simulation Models
    Zhao, Mo ;
    Appiah, Justice
    2021-08-01 | PDF
    Traffic simulation models are increasingly being used in the transportation engineering profession—often, to solve complex problems that may not lend themselves to traditional analysis techniques. The application of traffic simulation models has traditionally been at the individual vehicle (microscopic) level or aggregate traffic stream (macroscopi ...
  • Development of Low VoltageExtended Runtime Signalized Intersection Using Backup Power after the Loss of Utility Power Due to Hurricanes
    Development of Low Voltage/Extended Runtime Signalized Intersection Using Backup Power after the Loss of Utility Power Due to Hurricanes
    Lin, Pei-Sung ;
    Kourtellis, Achilleas
    2021-08-01 | PDF
    This research study investigated the applicability of backup power systems to provide extended backup power to traffic signals after power loss due to hurricanes. CUTR researched available and experimental technologies and recommended three systems for testing to the Florida Department of Transportation (FDOT). The three selected systems were acqui ...
  • GISBased Environmental LongTerm Monitoring Web Portal Phase II
    GIS-Based Environmental Long-Term Monitoring Web Portal Phase II
    Terry, Leigh ;
    Smith, Randy K.
    2021-08-01 | PDF
    A GIS-based online portal was developed to store, analyze, and display data from multiple sources pertinent to the ALDOT Coliseum Boulevard groundwater contaminant plume site in Montgomery Alabama. These sources comprise various consultants involved with the site including geotechnical companies, water testing labs, law firms, and management person ...
  • Communicate Lessons Exchange Advice Record CLEAR Database Development
    Communicate Lessons, Exchange Advice, Record (CLEAR) Database Development
    Jaselskis, Edward J. ;
    Jhala, Arnav
    2021-07-31 | PDF
    Valuable lessons learned and best practices gleaned from construction projects often do not transfer to future generations of personnel due to the lack of a formalized process. This ongoing issue gives rise to the need to impart fresh training to new North Carolina Department of Transportation (NCDOT) employees once the aging workforce retires or i ...
  • Caltrans Autonomous Vehicles Industry Survey of Transportation Infrastructure Needs
    Caltrans Autonomous Vehicles Industry Survey of Transportation Infrastructure Needs
    Chan, Ching Yao ;
    Wang, Peggy
    2021-07-30 | PDF
    A survey was designed and conducted by inviting various AV industry players to practically answer one prime question "what transportation infrastructure improvements or modifications are needed to improve AV performance?" Based on the survey results, selected AV companies were interviewed. The purpose of the interviews was to have in-depth dialog w ...
  • A BeforeAfter Intervention Experiment and Survey
    A Before-After Intervention Experiment and Survey
    McBride, Elizabeth C ;
    Goulias, Konstadinos G.
    2021-07-29 | PDF
    In this project, we first develop a strong theoretical model accompanied by data collection to test some of its aspects for behavioral change research. Data collection shifted from the originally planned public transportation intervention to the examination of COVID-19 impacts on the life of Los Angeles Metropolitan area residents. In terms of subs ...
  • Accessibility With GetGoing
    Accessibility With GetGoing
    Eskenazi, Maxine ;
    Black, Alan W.
    2021-07-28 | PDF
    The goal of this proposal is to make the GetGoing system which enables seniors to get transportation information over the phone, to also serve individuals with impairments who need more information about how to get to a desired destination such as condition of sidewalks and where the relevant entrance of a building is located. The team will work wi ...
  • Surficial Stabilization of WildfireBurnt Hillslopes Using Xanthan Gum and Polyacrylamide
    Surficial Stabilization of Wildfire-Burnt Hillslopes Using Xanthan Gum and Polyacrylamide
    Akin, Idil Deniz ;
    Garnica, Sophia S
    2021-07-27 | PDF
    Post-wildfire erosion and the slope instability issues associated with it are a global problem that can negatively affect transportation corridors, the environment, and human life. Currently, mulch treatments are commonly used means of stabilizing wildfire-burnt hillslopes; however, mulch, especially agricultural straw mulch, can pose environmental ...
  • LargeScale and LongTerm Forecasting of Performance Measurement of Public Transportation Systems
    Large-Scale and Long-Term Forecasting of Performance Measurement of Public Transportation Systems
    Chiang, Yao-Yi ;
    Shahabi, Cyrus
    2021-07-26 | PDF
    Accurate forecasting of public transportation metrics is critical towards the high reliability and efficiency of the public transportation system. However, deploying a forecasting system to serve city-level public transportation with long-term forecasting is challenging. In this project, we develop the capability for processing the entire Los Angel ...
  • Quantifying Gully Erosion and Potential for Sediment and Phosphorus Pollution Reductions Achieved by Erosion Remediation Projects on Vermonts Roads
    Quantifying Gully Erosion and Potential for Sediment and Phosphorus Pollution Reductions Achieved by Erosion Remediation Projects on Vermont’s Roads
    Wemple, Beverley C. ;
    Estabrook, Emma
    2021-07-16 | PDF
    Erosion at road drainage outfalls and culvert outlets contributes to water quality impairment by discharging stormwater, sediment, sediment-bound nutrients, and other water quality contaminants to receiving waters. In Vermont, past work has quantified the importance of road surface and roadside (i.e. ditch) erosion to water quality impairment and p ...
  • Smart Glasses for Improving Mobility of Low Vision People Phase Two
    Smart Glasses for Improving Mobility of Low Vision People (Phase Two)
    Cai, Yang
    ORCID ICON IMG
    2021-07-15 | PDF
    This proposal aims to continue the work toward a prototype of the smart glasses with the digital bioptic lens. In Phase Two, the project will implement the digital bioptic lens on augmented reality glasses. Bioptic glasses is a telescope on glasses. It helps people with poor vision see details in the central retina area where it has degenerated by ...
  • UF UABs Phase I Demonstration Study Older Driver Experiences With Autonomous Vehicle Technology
    UF & UAB’s Phase I Demonstration Study: Older Driver Experiences With Autonomous Vehicle Technology
    Classen, Sherrilene ;
    Sisiopiku, Virginia
    2021-07-15 | PDF
    Older adults (>65 years) account for almost 20% of the population in the United States and prefer driving as their primary mode of transportation but are at greater risk for crash-related injuries and death, compared to younger drivers. Autonomous vehicles (AVs) may hold health and safety benefits for older drivers, if this segment of the populatio ...
  • Connected Vehicle Pilot Deployment Program Phase 1 Performance Measurement and Evaluation Support Plan New York City Final Report
    Connected Vehicle Pilot Deployment Program Phase 1: Performance Measurement and Evaluation Support Plan: New York City: Final Report
    Galgano, Steve ;
    Talas, Mohamad
    2021-07-14 | PDF
    This document describes the Performance Measurement and Evaluation Support Plan for the New York City Department of Transportation New York City (NYC) Connected Vehicle Pilot Deployment (CVPD) Project. The report documents the performance metrics that will be used to assess the success of the NYC CVPD project, the targets for improvement in those p ...
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