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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 2321 - 2340 of 36114 results
  • 07061 Optimizing Laboratory Curing Conditions for Hot Mix Asphalt to Better Simulate Field Behavior Brief
    0-7061: Optimizing Laboratory Curing Conditions for Hot Mix Asphalt to Better Simulate Field Behavior [Brief]
    Nazarian, Soheil ;
    Bhasin, Amit
    2022-12-31 | PDF
    The engineering properties of asphalt mixtures change with time. Shortly after placement, asphalt concrete (AC) layers are more susceptible to rutting. As the pavement ages, the AC layer becomes stiffer, brittle, and thus more susceptible to cracking. Current protocols provide guidelines for the selection of materials, the determination of the mate ...
  • Develop Improved Methods for Eliminating Striping on Roadway Surfaces Project Summary
    Develop Improved Methods for Eliminating Striping on Roadway Surfaces [Project Summary]
    Manzo, Maurizio ;
    Huang, Zhenhua
    2022-12-31 | PDF
    The project aimed to investigate current removal techniques and to put together and test a pulsed solid state fiber laser system as an alternative method for road markings removal. Firstly, a literature review and a national survey were conducted to understand the current state-of-the-art and industry standards regarding the removal of road stripes ...
  • Assessing System Performance of the Michigan Trunkline Measures and Analytical Procedures for Planning and Operations
    Assessing System Performance of the Michigan Trunkline: Measures and Analytical Procedures for Planning and Operations
    Zockaie, Ali ;
    Kamjoo, Ehsan
    2022-12-31 | PDF
    The Moving Ahead for Progress in the 21st Century Act (MAP-21) required transportation agencies to use performance-based approaches, and there are federal guidelines and programs to help agencies develop performance management systems. For the performance management strategies to be effective, it is critical to establish performance measures that a ...
  • Curved Integral Abutment Bridge Research Draft Final Report
    Curved Integral Abutment Bridge Research – Draft Final Report
    WSP USA Inc.  ...
    2022-12-28 | PDF
    The purpose of this research initiative is to investigate the effects of the degree of curvature on the behavior of curved integral abutment structures, with consideration for various skews, span lengths and layouts, and pile cantilever lengths. The results of this research will provide recommendations to implement findings through a design guideli ...
  • Competitive Bidding in Construction Contracting
    Competitive Bidding in Construction Contracting
    Liu, Hexu ;
    Kwigizile, Valerian
    2022-12-21 | PDF
    Competitive bidding and accurate cost estimation allow state departments of transportation (DOTs) to make effective use of budgeted funds to deliver construction projects. However, the different bidding procedures and practices in use affect the market competition in competitive bidding. For many state DOTs, including Michigan DOT (MDOT), obtaining ...
  • Public Perceptions of Transportation Fees Taxes and Electric Vehicles in North Carolina
    Public Perceptions of Transportation Fees, Taxes and Electric Vehicles in North Carolina
    Findley, Daniel ;
    Davis, Joy
    2022-12-15 | PDF
    This research effort is part of a collaborative research project between the North Carolina Department of Transportation (NCDOT) and North Carolina State University’s (NCSU’s) Institute for Transportation Research and Education. As North Carolina confronts increasing transportation budget deficits, reliable revenue generating mechanisms will become ...
  • HumanAugmented Technology Interaction HATI for Improving Construction Quality Control and Task Monitoring An Application of Augmented Reality AR for Visualization and Remote Project Management Support
    Human-Augmented Technology Interaction (HATI) for Improving Construction Quality Control and Task Monitoring: An Application of Augmented Reality (AR) for Visualization and Remote Project Management Support
    Ayer, Steven ;
    El Kassis, Rita
    2022-12-01 | PDF
    Construction projects often require effective communication between project participants dispersed across various physical locations. Traditional methods of communication might rely on site visits or telephone calls. However, site visits can lead to wasted time traveling to remote sites, and phone calls can omit critical site details due to limited ...
  • Electric Vehicle Infrastructure Plan in Illinois
    Electric Vehicle Infrastructure Plan in Illinois
    Kontou, Eleftheria ;
    Wu, Yen-Chu
    2022-12-01 | PDF
    We study the allocation of dynamic electric vehicle charging investments from the policymaker’s perspective, which aims to meet statewide emission-reduction targets for the Illinois passenger vehicle sector. We determine statewide charging deployment trajectories over a 30-year planning horizon and estimate their emission reduction. Electric vehicl ...
  • 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 ...
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