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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 3941 - 3960 of 36011 results
  • Redundancy of Twin Steel Box Girder Bridges
    Redundancy of Twin Steel Box Girder Bridges
    Mehrabi, Armin ;
    Azizinamini, Atorod
    2021-01-01 | PDF
    Currently, twin steel box girder bridges (TSGB) are classified as bridges with fracture critical members. Recent research results, however, demonstrated a high level of internal redundancy. The main question as to what load levels and performance measures established on a scientific basis should be used still remains unanswered. The objective of th ...
  • Results Discussion and Interpretation of Mussel Translocations
    Results, Discussion, and Interpretation of Mussel Translocations
    Fisher, Mark ;
    Hart, Michael A
    2021-01-01 | PDF
    Translocation is used to conserve mussels, yet there remains a debate about its merit due to poor understating of its effects on transported mussels. This study evaluated survivorship, body condition, and total glycogen and lipids for one common and widely distributed species (Cyclonaias pustulosa), two rare species (Cyclonaias petrina; Lampsilis b ...
  • Capillary Pressure Sensor Testing to Identify Curing Regimen in Freshly Placed Bridge Decks
    Capillary Pressure Sensor Testing to Identify Curing Regimen in Freshly Placed Bridge Decks
    Murray, Cameron D. ;
    Spann, Samuel W
    2021-01-01 | PDF
    Early-age plastic shrinkage cracking is a common problem with the construction of concrete bridge decks due to the high surface area-to-volume ratio and exposure to potentially detrimental environmental effects. Curing regimens are utilized to mitigate this cracking risk such as wet burlap-polyethylene sheeting, membrane forming curing compounds, a ...
  • Crash Data Analysis Tool 20 Research Report and User Guide
    Crash Data Analysis Tool 2.0: Research Report and User Guide
    Green, Eric ;
    Ross, Paul
    2021-01-01 | PDF
    This manual describes the Crash Data Analysis Tool (CDAT), which can be used by Kentucky Transportation Cabinet (KYTC) staff and the agency’s work partners to securely access crash datasets. CDAT users can query and download data using flags stored during post-processing.
  • GAQEBkSP A DRLBased Urban Traffic Dynamic Rerouting Framework Using FogCloud Architecture
    GAQ-EBkSP: A DRL-Based Urban Traffic Dynamic Rerouting Framework Using Fog-Cloud Architecture
    Du, Runjia ;
    Chen, Sikai
    2021-01-01 | PPT
    DRL(GAQ)-EBkSP model based-on fog-cloud architecture is proposed to dynamically reroute the vehicles in large transportation networks graph attention mechanism to fuse information and extract relevant information to enlarge the learning efficiency Proposed model outperforms baseline model (without learning) under different scenarios with different ...
  • Research Peer Exchange Summary Report Best Practices in SPR Part B Fundamentals Staff Development and Research Program Engagement
    Research Peer Exchange Summary Report: Best Practices in SPR Part B Fundamentals, Staff Development, and Research Program Engagement
    North Dakota. Dept. of Transportation  ...
    2021-01-01 | PDF
    The transportation research programs at the North Dakota, South Dakota, and Nebraska Departments of Transportations (DOTs) hosted a peer exchange to discuss the fundamentals of State Planning and Research (SPR) Part B funding and how DOTs can best encourage and implement staff development and research program engagement. The peer exchange was condu ...
  • Synthesis on the Best Practices for State DOTs to Determine Project Delivery Time Project Management and Ratio of Consultant to InHouse Design
    Synthesis on the Best Practices for State DOTs to Determine Project Delivery Time, Project Management, and Ratio of Consultant to In-House Design
    Jafari, Amirhosein ;
    Kermanshachi, Sharareh
    2021-01-01 | PDF
    Transportation agencies are experiencing unprecedented pressure to deliver projects successfully. An obvious response to this pressure is to improve the project delivery process through the implementation of available successful project management practices. Also, with increasing restraints upon budgets and large workloads, transportation agencies ...
  • Effectiveness of Teenage Support System TDSS on Reducing Traffic Violation Behaviors for Teenage Drivers at the Early Time of Licensure
    Effectiveness of Teenage Support System (TDSS) on Reducing Traffic Violation Behaviors for Teenage Drivers at the Early Time of Licensure
    Disi Tian, M S ;
    Morris, Nichole L.
    2021-01-01 | PDF
    Teenage drivers are at a disproportionate risk of fatal and serious injuries due to motor vehicle crashes. A Field Operational Test (FOT) funded by Minnesota Department of Transportation (MnDOT) used the Teen Driver Support System (TDSS) smartphone application to collect real-time driving performance data from a cohort of approximately 300 teen dri ...
  • Moving Forward Ohio Department of Transportation Research Program Newsletter 2021 Volume 1
    Moving Forward: Ohio Department of Transportation Research Program Newsletter- 2021 Volume 1
    Ohio’s Research Initiative for Locals
    2021-01-01 | PDF
    ORIL is a program designed to provide practice-ready solutions to real-world issues facing Ohio’s local transportation system through research. It’s a multi-organizational collaborative effort to improve the transportation network in Ohio’s counties, townships, cities and villages.
  • Using Emerging and Extraordinary Data Sources To Improve Traffic Safety
    Using Emerging and Extraordinary Data Sources To Improve Traffic Safety
    Tarko, Andrew P. ;
    Guo, Qiming
    2021-01-01 | PDF
    The current safety management program in Indiana uses a method based on aggregate crash data for conditions averaged over several-year periods with consideration of only major roadway features. This approach does not analyze the risk of crashes potentially affected by time-dependent conditions such as traffic control, operations, weather and their ...
  • Influence of Internal Curing on Measured Resistivity
    Influence of Internal Curing on Measured Resistivity
    Milla, Jose ;
    Rupnow, Tyson
    2021-01-01 | PDF
    The objective of this study was to evaluate the influence of internal curing and coarse aggregate type on concrete’s 28-day strength, as well as surface resistivity over time (at days 7, 14, 28, 56, 90, and 180). A total of 96 concrete mixtures were prepared to identify the effects of three coarse aggregate types, two water-to-cementitious (w/cm) r ...
  • Transportation Sales Taxes in Los Angeles Lessons from Forty Years of Experience
    Transportation Sales Taxes in Los Angeles: Lessons from Forty Years of Experience
    Wachs, Martin ;
    Amberg, Natalie
    2021-01-01 | PDF
    This is the second study of voter-approved transportation sales taxes in Los Angeles County performed by the UCLA Institute of Transportation Studies with support from the Haynes Foundation. The earlier study examined the history of the four half cent sales taxes enacted by voters in Los Angeles County between 1980 and 2016. The current study looke ...
  • Load Ratings for Standard Bridges Tech Transfer Summary
    Load Ratings for Standard Bridges [Tech Transfer Summary]
    Moffitt, Stephen W. ;
    Peterson, Jon E.
    2021-01-01 | PDF
    The primary objective of this project was to investigate the load carrying capacity of bridges designed using the current Iowa Department of Transportation (DOT) secondary road standard bridge plans which are based on Load and Resistance Factor Design (LRFD) methods. Proper evaluation of the load carrying capacity requires the use of Load and Resis ...
  • A Framework for Shaping the Deployment of Autonomous Vehicles and Advancing Equity Outcomes
    A Framework for Shaping the Deployment of Autonomous Vehicles and Advancing Equity Outcomes
    Steckler, Becky ;
    Howell, Amanda
    2021-01-01 | PDF
    Using experience from working on the Knight Autonomous Vehicle (AV) Initiative, Urbanism Next created this white paper to provide a foundation for public sector agencies to approach autonomous vehicle deployment and policy with a focus on equity. This report outlines ways that public agencies can identify community needs and shape deployment to ens ...
  • Using the Light Weight Deflectometer for PerformanceBased Quality Assurance Testing of Chemically Modified Subgrades
    Using the Light Weight Deflectometer for Performance-Based Quality Assurance Testing of Chemically Modified Subgrades
    Becker, Peter J.
    ORCID ICON IMG
    2021-01-01 | PDF
    This report documents the findings from SPR-4230 (Alternative Quality Assurance Methods for Compacted Subgrade). The main objective of SPR-4230 involved establishing performance-related quality assurance (QA) test methods for pavement subgrade construction. Because INDOT generally prefers specifying subgrade treatment type IBC (i.e., 14-in. cement ...
  • Load Rating for Standard Bridges Final Report for TR785
    Load Rating for Standard Bridges – Final Report for TR-785
    Moffitt, Stephen W. ;
    Peterson, Jon E.
    2021-01-01 | PDF
    In this report, seventeen Iowa secondary and primary bridge standards for three types of bridges are rated utilizing the Load and Resistance Factor methodology and AASHTO BrR Bridge Rating software, Version 6.8.4.3001. Load ratings in this report are in compliance with the AASHTO Manual for Bridge Evaluation, 3rd Edition, with Interim Specification ...
  • Repair and Strengthening of Bridges in Indiana Using Fiber Reinforced Polymer Systems Volume 1 Review of Current FRP Repair Systems and Application Methodologies
    Repair and Strengthening of Bridges in Indiana Using Fiber Reinforced Polymer Systems: Volume 1 - Review of Current FRP Repair Systems and Application Methodologies
    Pevey, Jon M. ;
    Rich, William B.
    2021-01-01 | PDF
    For bridges that are experiencing deterioration, action is needed to ensure the structural performance is adequate for the demands imposed. Innovate repair and strengthening techniques can provide a cost-effective means to extend the service lives of bridges efficiently and safely. The use of fiber reinforced polymer (FRP) systems for the repair an ...
  • Evaluation of DOTDs Existing Queue Estimation Procedures
    Evaluation of DOTD’s Existing Queue Estimation Procedures
    Codjoe, Julius ;
    Thapa, Raju
    2021-01-01 | PDF
    Louisiana Department of Transportation and Development (DOTD) requests that freeway lanes should not be closed for construction work during hours when capacity exceeds 1,309 pcphpl. It is not known how accurate this 1,309 pcphpl value is when compared to actual queuing related to real world work zones in Louisiana. This study provided literature on ...
  • Louisiana Transportation Research Center 20192020 Annual Report
    Louisiana Transportation Research Center: 2019–2020 Annual Report
    Louisiana Transportation Research Center
    2021-01-01 | PDF
    This publication is a report of the transportation research, technology transfer, education, and training activities of the Louisiana Transportation Research Center for July 1, 2019–June 30, 2020. The center is sponsored jointly by the Louisiana Department of Transportation and Development and Louisiana State University.
  • Michigan Department of Transportation Research Advisory Committee Region 3 Peer Exchange October 1315 2020
    Michigan Department of Transportation Research Advisory Committee Region 3 Peer Exchange: October 13-15, 2020
    CTC & Associates LLC
    2021-01-01 | PDF
    The Michigan Department of Transportation (MDOT) hosted a virtual peer exchange meeting on October 13-15, 2020, to discuss topics related to transportation research goals, strategies and processes with other state DOTs. The meeting and the subsequent publication of this report fulfill the agency’s obligation to conduct a periodic peer exchange as p ...
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