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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 36114 results
  • Shear Behavior of Spliced Posttensioned Girders With Ungrouted Tendons Final Report
    Shear Behavior of Spliced Post-tensioned Girders With Ungrouted Tendons: Final Report
    Han, Sangyoung ;
    Zaborac, Jarrod
    2022-09-01 | PDF
    This experimental study was developed to evaluate the shear performance of spliced post-tensioned girders with grouted and ungrouted ducts. Demand for expedited construction processes and increased girder spans make spliced girder systems attractive options for medium- to long-span bridges. Since the spliced girder elements are subjected to signifi ...
  • Infrastructure Needs North Dakotas County Township and Tribal Roads and Bridges 20222041
    Infrastructure Needs: North Dakota’s County, Township, and Tribal Roads and Bridges: 2022-2041
    Upper Great Plains Transportation Institute  ...
    2022-09-01 | PDF
    This report is the response to the North Dakota Legislature's request for a study of the transportation infrastructure needs of all counties, townships and tribes in the state. In 2019, the North Dakota Legislature advanced HB 1066 which had a provision for funding distributions to non-oil producing counties based on the most recent version of this ...
  • Understanding Asset Management Systems Utilized by Municipalities in Massachusetts
    Understanding Asset Management Systems Utilized by Municipalities in Massachusetts
    Mogawer, Walaa S. ;
    Austerman, Alexander J.
    2022-09-01 | PDF
    A MassDOT goal is to have an overall idea of the pavement condition of state and local roads in Massachusetts. This study cataloged the different pavement management systems (PMS) being used by municipalities, Metropolitan Planning Organizations (MPOs), and Regional Planning Agencies (RPAs) throughout Massachusetts. A comprehensive literature revie ...
  • Integrating Drones Into MDOTs DaytoDay Traffic and Asset Management Project Spotlight
    Integrating Drones Into MDOT’s Day-to-Day Traffic and Asset Management [Project Spotlight]
    Cook, Steven J.
    2022-09-01 | PDF
    The capabilities of unmanned/uncrewed aerial system (UAS) continue to advance, with a wide variety of applications useful for the condition assessment and monitoring of transportation infrastructure. This Phase 3 project focused on four UAS uses cases and how to integrate their results into Michigan Department of Transportation (MDOT) databases and ...
  • Improving the Longterm Condition of Pavements in Massachusetts and Determining Return on Investment Implementing the AASHTO MechanisticEmpirical Pavement Design GuidePHASE II
    Improving the Long-term Condition of Pavements in Massachusetts and Determining Return on Investment: Implementing the AASHTO Mechanistic-Empirical Pavement Design Guide—PHASE II
    Mogawer, Walaa S. ;
    Austerman, Alexander J.
    2022-09-01 | PDF
    The goal of this study was to develop an AASHTOWare® Pavement M-E user’s manual and develop a local experimental plan and sampling template for Massachusetts. A stand-alone software manual was developed that provides a thorough step-by-step procedure on how to use the software. The manual guides users on how to generate the data, in particular, mat ...
  • FDOT Identification of Prospective Solutions for Florida Trade Imbalance and Empty Backhauls
    FDOT Identification of Prospective Solutions for Florida Trade Imbalance and Empty Backhauls
    Ozkul, Seckin ;
    Hooker, Robert
    2022-09-01 | PDF
    Florida struggles with a serious imbalance between inbound and outbound freight. Statistics from the Federal Highway Administration reveal that the total freight tonnage entering Florida is nearly double the tonnage leaving the state. This imbalance suggests that many trucks and other modes of freight transportation leave the state empty or only pa ...
  • Automated Methodological Procedure for Identifying CurveRelated Crashes in CRIS
    Automated Methodological Procedure for Identifying Curve-Related Crashes in CRIS
    Xu, Yang ;
    Han, Zhe
    2022-09-01 | PDF
    The product developed by Project 0-7050 is an automated methodological procedure for identifying curve-related crashes in CRIS. This document provides detailed information on the implementation of the automated methodological procedure. In order to automatically implement the methodological procedure for identifying curve-related crashes, the CTR r ...
  • TransportationRelated Behaviors and Attitudes A Survey of Floridas Aging Road Users Summary
    Transportation-Related Behaviors and Attitudes: A Survey of Florida’s Aging Road Users [Summary]
    Holley, Gail M. ;
    Barrett, Anne
    2022-09-01 | PDF
    The goal of the survey was to help identify transportation issues faced by older Floridians and guide the SMFLC in developing strategies and resources to address these issues. Behaviors and attitudes of interest included use of various transportation options, planning for retirement from driving, self-assessment of driving behavior, and others. The ...
  • Vermont Agency of Transportation 2022 Research Peer Exchange
    Vermont Agency of Transportation 2022 Research Peer Exchange
    Johnson, Katie ;
    Seeber, Kirsten
    2022-09-01 | PDF
    The Vermont Agency of Transportation (Vermont AOT) hosted a virtual peer exchange on June 7, 14 and 21, 2022, to discuss topics related to transportation research with other state departments of transportation (DOTs). The meeting and the subsequent publication of this report fulfill the agency’s obligation to conduct a periodic peer exchange as par ...
  • Virtual Public Involvement VPI Guidance for Encouraging Public Participation and Soliciting Feedback During the Transportation Planning Process
    Virtual Public Involvement (VPI) Guidance for Encouraging Public Participation and Soliciting Feedback During the Transportation Planning Process
    Ashuri, Baabak ;
    Kingsley, Gordon
    2022-09-01 | PDF
    In transportation planning and decision-making processes, public involvement (PI) is critical as the daily users of transportation share useful insights, opinions, and observations on the performance and needs of the transportation systems. Virtual Public Involvement (VPI) is the use of digital technology to engage individuals in project planning a ...
  • Development of Educational Materials for the Public and First Responders on the Limitations of Advanced Driving Assistance Systems
    Development of Educational Materials for the Public and First Responders on the Limitations of Advanced Driving Assistance Systems
    Rahman, Md Ashikur ;
    Mekker, Michelle
    2022-09-01 | PDF
    With the advancement of automated vehicle technologies, it is critical to understand the knowledge gap among drivers on the limitations and safety restrictions of existing advanced driving assistance systems (ADAS), which contributes to dangerous driving habits and misjudgments. For example, some ADAS include adaptive cruise control, but many drive ...
  • Integration of Stated Preference and Revealed Preference Methods in Regional Travel Survey Programs Project Summary
    Integration of Stated Preference and Revealed Preference Methods in Regional Travel Survey Programs [Project Summary]
    Bhat, Chandra ;
    Asmussen, Katherine
    2022-08-31 | PDF
    This project’s two objectives were: 1) Exemplify state-of-the-art SP techniques and recommend the addition of SP experiments to existing surveys to enhance their use for long-term travel forecasts. 2) Provide proof of concept and applicable travel behavior results through the design, deployment, and analysis of an RP-SP survey that concentrated on ...
  • 06923 Develop Guidelines and Design Program for Hot Mix Asphalts Containing RAP RAS and Other Additives through a Balanced Mix Design Process
    0-6923: Develop Guidelines and Design Program for Hot Mix Asphalts Containing RAP, RAS and Other Additives through a Balanced Mix Design Process
    Nazarian, Soheil ;
    Garcia, Vince
    2022-08-31 | PDF
    Asphalt mixtures must ideally exhibit acceptable cracking and rutting properties to perform well in major concern. Improving the durability and long-term performance of asphalt mixtures has become a major concern, especially with the rapidly increasing use of recycled materials, warm mix asphalt additives and modified binders. Given that available ...
  • Expand Applications for Texas Connected Freight Corridors Summary
    Expand Applications for Texas Connected Freight Corridors {Summary]
    Wood, Nick
    2022-08-31 | PDF
    The Texas Connected Freight Corridors (TCFC) system is a connected vehicle (CV) environment that seeks to improve safety and mobility for the Texas Triangle, which consists of the Austin, Dallas/Fort Worth, Houston, San Antonio, and Laredo metropolitan regions, as seen in Figure 1.
  • Understanding the Impact of Autonomous Vehicles on LongDistance Passenger and Freight Travel in Texas Project Summary
    Understanding the Impact of Autonomous Vehicles on Long-Distance Passenger and Freight Travel in Texas: Project Summary
    Kockelman, Kara ;
    Fakhrmoosavi, Fatemeh
    2022-08-31 | PDF
    Researchers simulated US transportation systems and forecasted the impacts of AVs and shared AVs (SAVs) on destination and mode choices of long-distance passenger and freight trips within the US, targeting a future 20+ years from now. They created demand sub-models for vehicle ownership, trip timing/scheduling and frequency, trip purpose and travel ...
  • Developing Guidelines for Precoating of Aggregates Used in Seal Coats Project Summary
    Developing Guidelines for Precoating of Aggregates Used in Seal Coats [Project Summary]
    Bhasin, Amit ;
    Lopez, Erica
    2022-08-31 | PDF
    Researchers investigated the effect of several influencing factors on the performance of precoated aggregates in seal coats based on a thorough literature review and a survey of TxDOT and other state DOT personnel. Researchers evaluated tests that measure the area of surface coating on precoated aggregate and determined that an image analysis techn ...
  • 07135 Synthesis of Best Application and Verification Practices for LongLife Pavement Markings Project Summary
    0–7135: Synthesis of Best Application and Verification Practices for Long-Life Pavement Markings [Project Summary]
    Qiao, Fengxiang ;
    Kazimi, Sayed Abuzar
    2022-08-31 | PDF
    To perform this project, the researchers followed five steps. In Step 1, the researchers collected information necessary for identifying best case examples of quality control of liquid and thermoplastic pavement marking material applications. They reviewed practices across the U.S. and other countries using various sources, such as government manua ...
  • Use of Tamper Bar Paver to Place ThickLift Asphalt Concrete Pavement Summary
    Use of Tamper Bar Paver to Place Thick-Lift Asphalt Concrete Pavement [Summary]
    Wilson, Bryan
    2022-08-31 | PDF
    Asphalt concrete placement specifications have maximum allowable lift thicknesses to ensure adequate mixture compaction. When the design thickness exceeds this limit, placement must be phased in multiple lifts, creating other problems: - Increased construction time, traffic exposure, and traffic disruption; - Potentially worse performance from poor ...
  • Synthesis for Best Practices for Preventive Maintenance Preparatory Work Summary
    Synthesis for Best Practices for Preventive Maintenance Preparatory Work [Summary]
    Goehl, Darlene ;
    Estakhri, Cindy
    2022-08-31 | PDF
    The synthesis study focused on pavement preparatory work performed before preventive maintenance (PM) surfacing contracts with the goal of answering, “What work needs to be performed to the roadway before a new surface is placed?” Preparatory work performed by in-house maintenance forces or maintenance contracts may include crack sealing, fog seal, ...
  • Pavement Rehabilitation and Design Strategy for Heavy Loads in the Energy Development Areas Project Summary Report
    Pavement Rehabilitation and Design Strategy for Heavy Loads in the Energy Development Areas [Project Summary Report]
    Zhou, Fujie ;
    Scullion, Tom
    2022-08-31 | PDF
    Researchers analyzed all the traffic data collected by both permanent and portable weigh-in-motion stations around Texas and developed default load spectrum inputs for interstate highways, state highways, FM roads, and energy development areas. The researchers then presented the six-step pavement rehabilitation and design strategy and applied it to ...
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