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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 2521 - 2540 of 35909 results
  • Use of Roundabouts and Innovative Intersection Designs at HighSpeed Intersections in Texas Project Summary
    Use of Roundabouts and Innovative Intersection Designs at High-Speed Intersections in Texas [Project Summary]
    Brewer, Marcus A. ;
    Fitzpatrick, Kay
    2022-07-31 | PDF
    Innovative intersection designs (e.g., diverging diamond interchanges [DDIs], displaced left turns [DLTs], median U-turns [MUTs], and restricted crossing U-turns [RCUTs]) and modern roundabouts have been used successfully to remove conflict points and redistribute turning traffic from traditional intersections. However, minimal guidance exists on u ...
  • BFRP Rebar Characterization and Performance Testing Protocol and Material Specifications for Basalt Fiber Reinforced Polymer Bars
    BFRP Rebar Characterization and Performance: Testing Protocol and Material Specifications for Basalt Fiber Reinforced Polymer Bars
    Kampmann, Raphael ;
    Tang, Youneng
    2022-07-30 | PDF
    This research was conducted to evaluate the performance of three commercially available BFRP rebar products and their individual raw material components, before and after exposure to nine different aggressive environments at 60°C for 300d and 600d, to development acceptance criteria specifically for basalt-based fiber reinforced polymer (BFRP) rein ...
  • Integration of Stated Preference and Revealed Preference Methods in Regional Travel Survey Programs Workshop
    Integration of Stated Preference and Revealed Preference Methods in Regional Travel Survey Programs: Workshop
    Bhat, Chandra ;
    Asmussen, Katherine
    2022-07-21 | PPT
    The research team (PA) will (1) identify state-of-the-art stated preference (SP) techniques, (2) develop a guidebook that explains the factors to consider when designing an integrated revealed preference (RP)-SP survey, (3) recommend to TxDOT the SP components that may be appended to existing surveys to enhance their use for long-term travel foreca ...
  • Improving Concrete Patching Practices on Iowa Roadways
    Improving Concrete Patching Practices on Iowa Roadways
    Nelson, Todd D. ;
    Pham, Le T.
    2022-07-08 | PDF
    This research effort aims to improve pavement patching practices in Iowa by identifying best practices used for portland cement concrete (PCC) pavement repairs in the upper Midwestern United States and by developing guidelines and tools for improved materials selection, repair installation, and quality assurance and quality control (QA/QC) of full- ...
  • Factors Affecting Development Decisions and Construction Delay of Housing in TransitAccessible and JobsRich Areas in California
    Factors Affecting Development Decisions and Construction Delay of Housing in Transit-Accessible and Jobs-Rich Areas in California
    Marantz, Nicholas J ;
    Houston, Douglas
    2022-07-01 | PDF
    Recent state legislation addresses California’s housing affordability crisis by encouraging new development in transit accessible and/or jobs-rich areas. But policymakers lack key information about the effects of laws and plans on developers’ decisions about whether and where to build housing, and factors contributing to delays in receiving governm ...
  • Fatigue Life of Double Notch Alloy Steel Breakaway Couplings
    Fatigue Life of Double Notch Alloy Steel Breakaway Couplings
    Hahin, Christopher
    2022-07-01 | PDF
    Double notch alloy steel breakaway couplings have sustained numerous fatigue failures during their service life in Illinois. This report is an in-depth analysis of breakaway couplings that ruptured, resulting in collapse of a light pole falling across a 55-mph expressway. Pole was fortunately cleared away by maintenance before any collisions occurr ...
  • Estimating Strength From Stiffness for Chemically Treated Soils
    Estimating Strength From Stiffness for Chemically Treated Soils
    Shivakumar, Pranavkumar ;
    Gupta, Kanika
    2022-07-01 | PDF
    The central theme of this study is to identify strength-stiffness correlations for chemically treated subgrade soils in Indiana. This was done by conducting Unconfined Compression (UC) Tests and Resilient Modulus Tests for soils collected at three different sites—US-31, SR-37, and I-65. At each site, soil samples were obtained from 11 locations at ...
  • Performance of Wicking Geotextile H2Ri To Mitigate Pavement Pumping Phase 2
    Performance of Wicking Geotextile (H2Ri) To Mitigate Pavement Pumping – Phase 2
    Galinmoghadam, Javad ;
    Zhang, Xiong
    2022-07-01 | PDF
    Pumping is one of the major factors contributing to pavement failures, which reduces the pavement life, affects road safety, and increases maintenance costs. Existing methods that are used as drainage systems can drain gravitational (free) water undersaturated conditions but not the capillary water under an unsaturated condition. The objective of t ...
  • Design of an Evaluation Plan for Senate Bill 1046
    Design of an Evaluation Plan for Senate Bill 1046
    Chierichetti, Maria ;
    Moghadam, Armin
    2022-07-01 | PDF
    In an effort to understand and decrease alcohol-impaired driving as a primary collision factor In California, the research team designed an evaluation plan for California Senate Bill 1046 and its focus on ignition interlock devices as a sentence for Driving Under Influence offense. This plan will evaluate whether Senate Bill 1046 affected the Drivi ...
  • Division of Engineering Services Research OnCall Agreement 34652 Task 6 Noise Barrier Foundation Design
    Division of Engineering Services Research On-Call Agreement #34652. Task #6, Noise Barrier Foundation Design
    Narsavage, Peter
    ORCID ICON IMG
    2022-07-01 | PDF
    The Ohio Department of Transportation (ODOT) wishes to develop a design method for drilled shaft foundations of noise barriers, using the software program LPILE. To accomplish this task, the research team performed the following activities: 1) Determine appropriate design loads and design criteria, 2) Review and evaluate soil strength correlations ...
  • Employing a Modified Delphi Approach To Explore Scenarios for Californias Transportation and Land Use Future
    Employing a Modified Delphi Approach To Explore Scenarios for California’s Transportation and Land Use Future
    Gahbauer, John ;
    Wasserman, Jacob L.
    2022-07-01 | PDF
    There are many methods for engaging experts in interactive groups to explore, clarify, and/or decide on various issues. In an investigation of possible future transportation and land use scenarios for California, we used techniques common to several methods and developed our own variation, a “hybrid policy Delphi,” for use with a panel of 18 expert ...
  • Assessing and Improving the Application of Multimodal Performance Measures in WSDOT Projects
    Assessing and Improving the Application of Multimodal Performance Measures in WSDOT Projects
    Arabkhedri, Borna ;
    Malarkey, Daniel
    2022-07-01 | PDF
    This report assesses the application of multimodal performance measures and indicators in WSDOT’s design process. It characterizes the “state of the knowledge” as reflected in the scholarly research on how best to achieve multimodal goals in projects. It characterizes the “state of the practice” by reviewing the design manuals, guidebooks, and hand ...
  • Automated and Connected Vehicle AVCV Test Bed To Improve Transit Bicycle and Pedestrian Safety Phase III Technical Report
    Automated and Connected Vehicle (AV/CV) Test Bed To Improve Transit, Bicycle, and Pedestrian Safety Phase III: Technical Report
    Turnbull, Katherine F. ;
    Sunkari, Srinivasa
    2022-07-01 | PDF
    Crashes involving transit vehicles, bicyclists, and pedestrians are a concern in Texas, especially in urban areas. This research explored the potential of automated and connected vehicle (AV/CV) technology to reduce or eliminate these crashes. The project objectives focused on identifying safety concerns related to the interaction of transit vehicl ...
  • Lateral Analysis Guidelines for Drilled Shafts in Nevada Based on LRFD Framework
    Lateral Analysis Guidelines for Drilled Shafts in Nevada Based on LRFD Framework
    Motamed, Ramin ;
    Siddharthan, Raj V.
    2022-07-01 | PDF
    The major goal of this research is to improve the conventional p-y analysis in the context of larger diameter drilled shafts. The conservative lateral response due to the absence of lateral resistance components in p-y analysis for larger diameter shafts has been termed as ‘diameter effect’ in past research. To apply and evaluate the proposed unifi ...
  • Electrification Plan for State of Utah Airport Infrastructure
    Electrification Plan for State of Utah Airport Infrastructure
    Christensen, Carsten ;
    Christensen, David
    2022-07-01 | PDF
    A framework is described to aid government and private entities in exploring the impacts of electrified aviation technology on the aviation ecosystem and to plan grid and charging infrastructure development at airports in preparation to support electrified aviation. Exploratory analyses are conducted to forecast the deployment and adoption of elect ...
  • DataDriven Bridge Management Using Descriptive and Predictive Machine Learning Models Research Brief
    Data-Driven Bridge Management Using Descriptive and Predictive Machine Learning Models [Research Brief]
    Banaei-Kashani, Farnoush ;
    Rens, Kevin
    2022-07-01 | PDF
    Since the 1970’s, several U.S. Acts have mandated all local and state transportation agencies across the nation to perform regular inspections of the bridges (and culverts) in their jurisdiction. These have generated valuable historical databases of bridge performance data which have remained considerably underutilized.
  • Acoustic Effectiveness of Vinyl Fence Noise Walls Fact Sheet
    Acoustic Effectiveness of Vinyl Fence Noise Walls [Fact Sheet]
    Burton, Kimberly ;
    Agarwal, Ruchi
    2022-07-01 | PDF
    There are currently a variety of materials from which noise walls can be constructed, but there has been limited research on vinyl noise walls, so this project studied the acoustic, aesthetic, and cost benefits of vinyl materials to guide future noise mitigation implementation strategies. The research team studied vinyl noise walls to determine if ...
  • Characterization of Unbound Materials for MechanisticEmpirical Pavement Design for NDOT Districts 2 and 3
    Characterization of Unbound Materials for Mechanistic-Empirical Pavement Design for NDOT Districts 2 and 3
    Sebaaly, Peter E. ;
    Othman, Omar
    2022-07-01 | PDF
    The resilient modulus is a critical engineering property used to characterize the unbound and subgrade materials in the AASHTO Mechanistic Empirical Pavement Design Guide (MEPDG) where a hierarchical approach is followed. Three levels of input are specified in the AASHTOWare® Pavement ME design software. This includes direct measurement from the la ...
  • Innovation to Implementation Collaborative Forums To Boost ResearchBased Solutions to Transformational Technology and Innovation
    Innovation to Implementation: Collaborative Forums To Boost Research-Based Solutions to Transformational Technology and Innovation
    Camp, Janey ;
    Ivey, Stephanie
    2022-07-01 | PDF
    Technology is changing rapidly in this world, especially with regards to transportation. Recent advancements have potential to significantly change transportation system design, operations, and management in Tennessee and beyond. Additionally, innovation and “out of the box” thinking is contributing to improved workflows and more efficient processe ...
  • Development of Guidelines for Inspection Repair and Use of Portable Concrete BarriersVolume 2 Crash Report
    Development of Guidelines for Inspection, Repair, and Use of Portable Concrete Barriers—Volume 2: Crash Report
    Dobrovolny, Chiara Silvestri ;
    Schroeder, William J. L
    2022-07-01 | PDF
    The purpose of the tests reported herein was to assess the performance of the damaged portable concrete barrier according to the safety-performance evaluation guidelines included in the American Association of State Highway and Transportation Officials Manual for Assessing Safety Hardware (MASH), Second Edition. The crash tests were performed in ac ...
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