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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 3361 - 3380 of 35958 results
  • North Dakota Statewide Traffic Safety Survey 2021 Traffic Safety Performance Measures for State and Federal Agencies
    North Dakota Statewide Traffic Safety Survey, 2021: Traffic Safety Performance Measures for State and Federal Agencies
    Vachal, Kimberly ;
    Kubas, Andrew
    2021-08-01 | PDF
    The statewide driver traffic safety survey provides baseline metrics for the Safety Division and others to use in understanding perceptions and self-reported behaviors related to focus issues. A core set of questions addresses nationally agreed upon priorities, including seat belts, impaired driving, and speeding. In addition to the core issues, qu ...
  • Simplified Cone Penetration Test PerformanceBased Assessment of Liquefaction and Effects Phase 2 Tasks 510
    Simplified Cone Penetration Test Performance-Based Assessment of Liquefaction and Effects: Phase 2, Tasks 5–10
    Franke, Kevin W ;
    He, Jingwen
    2021-08-01 | PDF
    The purpose of the research presented here 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 di ...
  • Evaluation of Asphalt Binder Rejuvenators for Use in Recycled Asphalt
    Evaluation of Asphalt Binder Rejuvenators for Use in Recycled Asphalt
    Rodezno, Carolina ;
    Moraes, Raquel
    2021-08-01 | PDF
    This research evaluated the effectiveness of bio-based and petroleum-based rejuvenators in restoring the properties of asphalt binder blends and mixtures containing high content of reclaimed asphalt pavement (RAP). The rheological and chemical evaluation of binder blends included rotational viscosity, Superpave Performance Grading (PG), Multiple St ...
  • Traffic Safety Evaluation at Reduced Conflict Intersections in Minnesota
    Traffic Safety Evaluation at Reduced Conflict Intersections in Minnesota
    Moreland, Max ;
    Leuer, Derek
    2021-08-01 | PDF
    Between 2010 and 2020, 49 Reduced Conflict Intersections (RCIs) were installed on Minnesota Department of Transportation (MnDOT) roadways. The RCI is an alternative intersection layout that is intended to provide safety benefits by limiting the number of points within an intersection that two or more vehicle paths might intersect. Both a before-aft ...
  • Entrusted EngineerinCharge A New Critical Position in the DesignBuild Team
    Entrusted Engineer-in-Charge: A New Critical Position in the Design–Build Team
    Ashuri, Baabak ;
    Lee, Jung Hyun
    2021-08-01 | PDF
    One of the main challenges that state departments of transportations (state DOTs) face in their design–build (DB) projects is to ensure that the design–build team upholds the highest standard of care in making complex engineering decisions involving multidisciplinary works. It is crucial to understand the underpinnings of engineering-related proble ...
  • Climate Action Plan Revitalizing Efforts to Bolster Adaptation Increase Resilience
    Climate Action Plan: Revitalizing Efforts to Bolster Adaptation & Increase Resilience
    United States. Department of Transportation. Office of the Secretary of Transportation. Office of the Deputy Assistant Secretary for Climate Policy
    2021-08-01 | PDF
    Pursuant to Section 211 of Executive Order (E.O.) 14008, Tackling the Climate Crisis at Home and Abroad and Council on Environmental Quality’s (CEQ) Implementing Instructions,1 the U.S. Department of Transportation (DOT or Department) has developed and submitted this Climate Action Plan (Plan). This Plan builds from the previous Climate Action Plan ...
  • PlugIn Electric Vehicle Diffusion in California Role of Exposure to New Technology at Home and Work
    Plug-In Electric Vehicle Diffusion in California: Role of Exposure to New Technology at Home and Work
    Chakraborty, Debapriya ;
    Bunch, David S
    2021-08-01 | PDF
    The market for plug-in electric vehicles (PEVs) that primarily include battery electric vehicles (BEVs) and plug-in hybrid vehicles (PHEVs) has been rapidly growing in California for the past few years. Given the targets for PEV penetration in the state, it is important to have a better understanding of the pattern of technology diffusion and the f ...
  • Continued Updating the Lane Closure Guide for Urban Highways in the Kansas City Kansas Metropolitan Area
    Continued Updating the Lane Closure Guide for Urban Highways in the Kansas City, Kansas, Metropolitan Area
    Fitzsimmons, Eric J. ;
    Sharif, Mirza Ahammad
    2021-08-01 | PDF
    Temporary work zones in the United States continue to be an important and necessary aspect of preserving, expanding, and maintaining the roadway infrastructure network. However, work zones present a unique variable in that depending on the type of work being performed, they may require a reduction in roadway capacity if one or more lanes are closed ...
  • 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 ...
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