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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 2341 - 2360 of 36151 results
  • Best Practices for Work Zone Safety During Traffic Control Placement Removal and Modification
    Best Practices for Work Zone Safety During Traffic Control Placement, Removal, and Modification
    Gambatese, John A. ;
    Moeung, Serey Raksa
    2022-12-01 | PDF
    Studies have shown that drivers are at a higher risk of being involved in a crash when travelling through a work zone compared to normal driving conditions. Research further suggests that the crashes that occur in work zones are, on average, more severe than crashes that occur outside of work zones. The periods while temporary traffic control is be ...
  • PerformanceEngineered Concrete Paving Mixtures Tech Summary
    Performance-Engineered Concrete Paving Mixtures [Tech Summary]
    Taylor, Peter ;
    Ley, Tyler
    2022-12-01 | PDF
    This Performance-Engineered Concrete Paving Mixtures Transportation Pooled Fund—TPF-5(368)—brought newer concrete pavement technologies to state agencies and assisted states in the adoption of specifications and test methods that will help them deliver on the promise of concrete durability.
  • Guide to Remediate Bridge Deck Cracking Tech Transfer Summary
    Guide to Remediate Bridge Deck Cracking [Tech Transfer Summary]
    ElBatanouny, Mohamed K. ;
    Hawkins, Kathleen A.
    2022-12-01 | PDF
    The primary objective of this study was to develop a comprehensive guide for remediating cracks in bridge decks in Iowa that users could reference for guidance on the selection and implementation of crack repairs. The guide was to include decision matrices and tables for selecting crack remediation strategies based on existing deck condition, deck ...
  • Utilizing LiDAR Sensors to Detect Pedestrian Movements at Signalized Intersections
    Utilizing LiDAR Sensors to Detect Pedestrian Movements at Signalized Intersections
    Li, Pengfei (Taylor) ;
    Yang, Xianfeng (Terry)
    2022-12-01 | PDF
    National Highway Traffic Safety Administration (NHTSA) has reported that pedestrian fatalities increased by 44% from 2010 to 2019, and more than 20% of pedestrian fatalities occurred at intersections. To improve pedestrian safety, it would be necessary to first observe evolving pedestrian behaviors. To serve this purpose, in this research project, ...
  • Epoxy Dowel Pile Splice Evaluation Summary
    Epoxy Dowel Pile Splice Evaluation [Summary]
    Mehrabi, Armin
    ORCID ICON IMG
    2022-12-01 | PDF
    Because of Florida’s varied soils, establishing bridge foundation pile lengths can be difficult. Many times, piles must be driven very deep to secure them. Because there are limits on the length of piles that can be shipped to a work site, pile segments are usually connected onsite using dowels to make them longer.
  • Business Analysis for Idahos Next Transportation Investment System
    Business Analysis for Idaho’s Next Transportation Investment System
    Van Dyke, Rebecca ;
    Munn, Chapman
    2022-12-01 | PDF
    The OTIS software was launched in 2015 to replace “Project Tracking,” the Access-based application ITD first developed to manage STIP-related data. Since then, users have experienced numerous foundational issues with OTIS that cause significant delays and occasional errors. Specifically, there is a two-part, mutually-dependent problem with the soft ...
  • Evaluation of EndofQueue Crash Mitigation Strategies at Flagging Stations on TwoLane Roads
    Evaluation of End-of-Queue Crash Mitigation Strategies at Flagging Stations on Two-Lane Roads
    Theiss, LuAnn ;
    Finley, Melisa D.
    2022-12-01 | PDF
    The objective of this research project was to identify and evaluate strategies to mitigate end-of-queue crashes at flagging stations on two-lane roads. The research team evaluated the following treatments based on feasibility and advantages of each treatment: • Install light-emitting diodes (LEDs) or a warning light on the static BE PREPARED TO STO ...
  • MultiSpan Lateral Slide Laboratory Investigation Phase II
    Multi-Span Lateral Slide Laboratory Investigation: Phase II
    Liu, Zhengyu ;
    Alomari, Abdalla
    2022-12-01 | PDF
    With slide-in bridge construction (SIBC), the bridge superstructure is constructed off the final alignment and then slid laterally from the temporary worksite onto the in-place substructure. Once the sliding is complete, closure joints between the bridge super- and sub-structure are cast to establish continuity. The cementitious materials and reinf ...
  • Development of Volumetric Acceptance and Percent Within Limits PWL and Criteria for Stone Metrix Asphalt SMA Mixtures in Indiana
    Development of Volumetric Acceptance and Percent Within Limits (PWL) and Criteria for Stone Metrix Asphalt (SMA) Mixtures in Indiana
    Lee, Jusang ;
    Haddock, John E.
    2022-12-01 | PDF
    SMA is designed based on SMA volumetric properties in terms of air voids content (Va), voids in the mineral aggregate(VMA), and adequate stone-on-stone contact. For construction quality assurance (QA) purposes, INDOT currently accepts SMAs based on aggregate gradation and asphalt binder content. Thus, there is a discrepancy between SMA design crite ...
  • Calibrating the Highway Safety Manual Predictive Methods for Texas Highways Technical Report
    Calibrating the Highway Safety Manual Predictive Methods for Texas Highways: Technical Report
    Geedipally, Srinivas R. ;
    Dixon, Karen
    2022-12-01 | PDF
    The Highway Safety Manual (HSM) contains safety performance functions (SPFs) that are used in project-level decision-making for estimating the average crash frequency by severity level for existing conditions, alternatives to existing conditions, or proposed new roadways. However, SPF calibration is needed because most of the existing HSM SPFs were ...
  • Evaluating PermittedProtected Versus Protected LeftTurn Signals in Louisiana
    Evaluating Permitted/Protected Versus Protected Left-Turn Signals in Louisiana
    Thapa, Raju ;
    Asaduzzaman, Md
    2022-12-01 | PDF
    The main objective of this study is to evaluate the safety and operation of existing left-turn signal phases at intersections and investigate relevant data to develop proper guidance on when it is appropriate to install each signal type. The study considered protected-only (PO), protected permitted left-turn (PPLT), and flashing yellow arrow (FYA) ...
  • Evaluation of the Local Bridge Improvement Assistance Program
    Evaluation of the Local Bridge Improvement Assistance Program
    Tabatabai, Habib ;
    Qin, Xiao
    2022-12-01 | PDF
    In 2019, a pilot program was initiated by the Wisconsin Department of Transportation (WisDOT) in consultation with the Wisconsin County Highway Association (WCHA) to streamline the delivery and oversight of Low-Risk local bridge projects. The goal of this research project was to evaluate the Low-Risk bridge pilot program and make recommendations be ...
  • Commodity Flow Data for Freight Network Infrastructure Planning Technical Summary
    Commodity Flow Data for Freight Network Infrastructure Planning [Technical Summary]
    Andrusko, Andrew ;
    Fonseca-Sarmiento, Camila
    2022-12-01 | PDF
    The goal of this project was to understand existing data sources to determine which are the most helpful for MnDOT’s planning, programming and design of freight network infrastructure.
  • Analysis of Mitigating Concrete Cracks With Bacteria Fact Sheet
    Analysis of Mitigating Concrete Cracks With Bacteria [Fact Sheet]
    Burris, Lisa ;
    Hull, Natalie
    2022-12-01 | PDF
    Incorporating bacteria into concrete has been proposed as a method of mitigating the negative impacts of concrete cracking, and may also lead to increased strength and durability through calcium carbonate precipitation and porosity reductions by the bacteria. This study aimed to increase understanding of the use of microorganisms in concrete by inv ...
  • Analysis of Mitigating Concrete Cracks With Bacteria Report
    Analysis of Mitigating Concrete Cracks With Bacteria [Report]
    Burris, Lisa ;
    Hull, Natalie
    2022-12-01 | PDF
    Incorporating bacteria into concrete has been proposed as a method of mitigating the negative impacts of concrete cracking, and may also lead to increased strength and durability through calcium carbonate precipitation and porosity reductions by the bacteria. This study aimed to increase understanding of the use of microorganisms in concrete by inv ...
  • Flooding Monitoring and Prediction System Development
    Flooding Monitoring and Prediction System Development
    Refai, Hazem H. ;
    Mousselli, Abdullah
    2022-12-01 | PDF
    The first half of this report details the design of a flooding emulation system to evaluate LiDAR-, radar-, and ultrasonic-based devices for monitoring water level rise and measure water flow speed. The second half of the report describes the incorporation of NOAA data with data collected at ODOT weather station to predict the potential of flooding ...
  • Application of MechanisticEmpirical Pavement Design Approach Into RCC Pavement Thickness Design
    Application of Mechanistic-Empirical Pavement Design Approach Into RCC Pavement Thickness Design
    Wu, Zhong ;
    Mahdi, Moinul I
    2022-12-01 | PDF
    As a durable, economical, and low-maintenance concrete material, roller compacted concrete (RCC) is steadily becoming the preferred choice for many highway pavement applications. However, the current RCC pavement thickness design procedures are solely empirically based, not following the state-of-practice of the mechanistic-empirical (M-E) pavement ...
  • Evaluation of Pavement ME Design Software for Flexible Pavements
    Evaluation of Pavement ME Design Software for Flexible Pavements
    Goehl, Darlene C ;
    Nyamuhokya, Tito
    2022-12-01 | PDF
    This research project is the first step toward Mechanistic-Empirical (ME) Design implementation for flexible pavements in Florida. The Florida Department of Transportation currently uses the American Association of State Highway and Transportation Officials 93 Method for flexible pavement design and is considering changing to the Pavement ME Design ...
  • Transit Facilities in New Hampshire DOT RightsofWay
    Transit Facilities in New Hampshire DOT Rights-of-Way
    Cambridge Systematics, Inc.
    2022-12-01 | PDF
    Public transit providers in New Hampshire have bus stops, transit amenities, and way finding signage within public highway rights-of-way (ROWs), including state-maintained ROWs. The New Hampshire Department of Transportation (NHDOT) lacked a clear policy or process by which a transit provider seeks and gains approval to implement these facilities a ...
  • Pile Driving Saximeter Application for iOS Android Devices
    Pile Driving Saximeter Application for iOS & Android Devices
    Glennie, Nikolas ;
    Silvey, Alex
    2022-12-01 | PDF
    Currently, field construction inspectors use a E-Saximeter (E-Sax) to determine the hammer fall of single action diesel hammers when driving pile during bridge construction. The hammer fall measurement is required to calculate the bearing capacity of the installed pile. Inspectors record the hammer fall data by hand and the data is entered into an ...
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