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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 1121 - 1140 of 36049 results
  • OSTR Research Roundup Newsletter June 2024
    OST-R Research Roundup Newsletter: June 2024
    United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology
    2024-06-01 | OST-R Research Roundup | PDF
    News from across OST-R and its research community.
  • Increasing Public Transportation Ridership by Integrated Transportation Planning With Micromobility Services in the State of Utah
    Increasing Public Transportation Ridership by Integrated Transportation Planning With Micromobility Services in the State of Utah
    Ewing, Reid ;
    Kalantari, Hannaneh A
    2024-06-01 | PDF
    Urban transportation systems face challenges in providing connectivity, particularly for the first and last miles of commuters' journeys. Micromobility services, exemplified by e-scooters, have emerged as potential solutions to bridge this gap and enhance the efficiency and accessibility of public transit. As transit ridership demonstrates declinin ...
  • Implementation of Semicircular Bend SCB Test for QCQA of Asphalt Mixtures Technical Summary
    Implementation of Semi-circular Bend (SCB) Test for QC/QA of Asphalt Mixtures [Technical Summary]
    Mohammad, Louay ;
    Rupnow, Tyson
    2024-06-01 | PDF
    The objective of this study was to develop practical methods to predict SCB Jc of long term aged (LTA) asphalt mixtures for use in QC/QA programs.
  • Develop Settlement Criteria and Design Approach for Embankments and Retaining Walls Built on Compressible Soils
    Develop Settlement Criteria and Design Approach for Embankments and Retaining Walls Built on Compressible Soils
    Huang, Jie ;
    Bin-Shafique, Sazzad
    2024-06-01 | PDF
    The overarching objective of this project is to identify settlement criteria for embankments and retaining walls and develop a systematic soil improvement design tool to facilitate the method selection and construction time and cost estimation. There is a consensus that the post-construction settlement has profound impacts on the service conditions ...
  • Design Coefficients of Friction for MoDOT PTFE Bearings Brief
    Design Coefficients of Friction for MoDOT PTFE Bearings [Brief]
    Wiss, Janney, Elstner Associates, Inc.
    2024-06-01 | PDF
    This report evaluates the design coefficients of friction for polytetrafluoroethylene (PTFE) bearings, identifying key influencing parameters through a literature review and a detailed test program. Seven parameters were studied: PTFE material and surface types, size, contact pressure, temperature, sliding speed, and surface contamination. The anal ...
  • RealTime Traffic Signal System Performance Measurement Project No 201614 Phase III System Integration Intersection Deployment and Control Center Dashboard Development
    Real-Time Traffic Signal System Performance Measurement (Project No. 2016–14) Phase III: System Integration, Intersection Deployment, and Control Center Dashboard Development
    Jin, Peter J. ;
    Brennan, Jr. Thomas M.
    2024-06-01 | PDF
    In the proposed third phase of the NJDOT Automated Traffic Signal Performance Measures (ATSPM) project, the research team 1) evaluated Roadside Unit (RSU) /Onboard Unit (OBU) data with ground truth data, 2) validated physical and virtual RSU deployment scenarios for pedestrian safety applications, 3) studied the boundary conditions of Light Detecti ...
  • Reducing LowTemperature Cracking on Local Roads Fact Sheet
    Reducing Low-Temperature Cracking on Local Roads [Fact Sheet]
    Nazzal, Munir D ;
    Berner, William (Chris)
    2024-06-01 | PDF
    This report summarizes the research work that was completed to: 1) assess the effects of the properties of the aggregates, binders, RAP, and asphalt mixtures on low-temperature cracking resistance of mixes used on local roads, and 2) develop recommendations and specifications for designing low volume pavements that are more resistant to low-tempera ...
  • Caltrans UAS and Driver Safety Driver Distraction in the Presence of UAS
    Caltrans UAS and Driver Safety: Driver Distraction in the Presence of UAS
    Akhavian, Reza ;
    Machiani, Sahar Ghanipoor
    2024-06-01 | PDF
    In this study, a driving simulator experiment was designed to assess driver distraction caused by roadside projects involving Unmanned Aerial Systems (UASs) and Under-Bridge Inspection Trucks (UBITs). The primary goals were to determine which scenario caused more distraction for drivers under various conditions, such as different UAS sizes, traffic ...
  • Develop Closure Joint Materials Specification and Evaluate Performance for SidebySide Accelerated Bridge Construction ABC Superstructure Systems
    Develop Closure Joint Materials Specification and Evaluate Performance for Side-by-Side Accelerated Bridge Construction (ABC) Superstructure Systems
    Lam, Justin ;
    Sabers, Michelle
    2024-06-01 | PDF
    The goal of this project was to develop, investigate, and implement optimized concrete mixtures to be used in closure pour connections between precast elements in side-by-side accelerated bridge construction (ABC) superstructure systems. This project involves the use of innovative materials and mixture proportions that are intended to provide high ...
  • Assessing Pavement Markings for Automated Vehicle Readiness
    Assessing Pavement Markings for Automated Vehicle Readiness
    Pike, Adam ;
    Shirinzad, Maryam
    2024-06-01 | PDF
    New technologies are being added to vehicles at a growing rate to assist drivers and even fully take over the driving task in some situations. These technologies are generally camera-based and typically rely on pavement markings to maintain vehicle position and navigate the roadway. As drivers become more reliant on these systems, and for these sys ...
  • Accommodating Innovative Uses of Public Right of Way
    Accommodating Innovative Uses of Public Right of Way
    Thompson, Travis ;
    Moses, David
    2024-06-01 | PDF
    State departments of transportation (DOTs) are embracing the use of clean energy and connectivity (CEC) applications along publicly owned right of way (ROW). Applications such as wind and solar power installations, broadband lines, small cell wireless equipment, electric vehicle charging stations, and technologies related to connected and automated ...
  • Bridge Column Footing Performance and Seismic Retrofit Evaluation Considering SoilStructure Interaction
    Bridge Column Footing Performance and Seismic Retrofit Evaluation Considering Soil-Structure Interaction
    Stuedlein, Armin W. ;
    Higgins, Christopher C.
    2024-06-01 | PDF
    This project investigated a new seismic retrofitting technique for bridge column-footing substructure components considering the influence of soil-structure interactions (SSI). The seismic retrofitting technique uses titanium alloy bars to provide both confinement of the concrete column and a supplemental flexural tension load path. Laboratory and ...
  • Evaluation of Static and Dynamic No Right Turn on Red Signs at Traffic Signals
    Evaluation of Static and Dynamic No Right Turn on Red Signs at Traffic Signals
    Day, Christopher ;
    Sharma, Anuj
    2024-06-01 | PDF
    This study examined the operation of static and dynamic no right turn on red (NRTOR) signs at eight signalized intersections in Minnesota (six dynamic and two static). Driver compliance with the NRTOR indications were measured using video data. Most dynamic NRTOR sign locations were pedestrian-activated, with one location having additional time-of- ...
  • Evaluation of ALDOT Erosion Control Practices using Rainfall Simulation on Various Soil Types and Slope Gradients
    Evaluation of ALDOT Erosion Control Practices using Rainfall Simulation on Various Soil Types and Slope Gradients
    Cater, Jack R ;
    Ethridge, Jacob A
    2024-06-01 | PDF
    Construction sites rely on erosion control practices to protect bare slopes and prevent soil loss. This study used large scale rainfall simulators to evaluate various erosion control methods used by the Alabama Department of Transportation (ALDOT) on construction sites. The study included the construction of 12 rainfall simulators at the Auburn Uni ...
  • Development of a New Tool for Evaluating Infrastructure and Planning Impacts Related to Changes in Truck Traffic and Truck Technologies Final Report
    Development of a New Tool for Evaluating Infrastructure and Planning Impacts Related to Changes in Truck Traffic and Truck Technologies: Final Report
    Morgan, Curtis ;
    Warner, Jeffery
    2024-06-01 | PDF
    Researchers developed a set of integrated infrastructure-based and economic models to evaluate the infrastructure and planning impacts of increased numbers of automated trucks and truck platoons operating on Texas highways. As automated and platooned truck technologies evolve and their use in Texas highway corridors continues to grow, it is critica ...
  • Stormwater BMP Inspection and Maintenance Resource Guide
    Stormwater BMP Inspection and Maintenance Resource Guide
    Erickson, Andrew J ;
    Gulliver, John S.
    2024-06-01 | PDF
    Stormwater treatment practices, often referred to as stormwater best management practices (BMPs), require a substantial commitment to maintenance, including regular inspections and assessments. Existing regulations require governmental units to develop a systematic approach for ongoing inspection and maintenance to ensure that they are achieving th ...
    Supporting Files
  • Pavement Rehabilitation Analysis A LifeCycle Cost and LongTerm Performance Comparison of Full Depth Reclamation and Overlays Research Brief
    Pavement Rehabilitation Analysis: A Life-Cycle Cost and Long-Term Performance Comparison of Full Depth Reclamation and Overlays [Research Brief]
    Torres-Machi, Cristina ;
    Evers, Elijah
    2024-06-01 | PDF
    To reduce the environmental impact of transportation, Departments of Transportation (DOTs) are incorporating cold-recycling technologies such as Full-Depth Reclamation (FDR) as an alternative for pavement rehabilitation. One of the limitations hindering the deployment of FDR is the limited information available on the material properties of these m ...
  • Load and Resistance Factor Rating Methodology Recommendations for Missouri Bridges Research Summary
    Load and Resistance Factor Rating Methodology Recommendations for Missouri Bridges [Research Summary]
    Thiagarajan, Ganesh ;
    Myers, John
    2024-06-01 | PDF
    Traditionally, the Missouri Department of Transportation (MoDOT) has performed bridge load ratings using a method called load factor rating (LFR). With changes to bridge design and heavier vehicles traveling Missouri’s highways, MoDOT is working to adopt an updated system called load and resistance factor rating (LRFR). The primary goal of this stu ...
  • Effect of Geotechnical and Environmental Properties of Maryland Compost and Compost Amended Topsoils on Vegetation Establishment and Growth Summary
    Effect of Geotechnical and Environmental Properties of Maryland Compost and Compost Amended Topsoils on Vegetation Establishment and Growth [Summary]
    Aydilek, Ahmet
    2024-06-01 | PDF
    Poor structural properties and nutrient profiles of disturbed soils often require supplemental organic matter for promoting better vegetation establishment. Compost and compost-related products, when added to soils, have proven to enhance plant growth and improve infiltration of rainwater, thereby mitigating soil erosion and excess nutrient release ...
  • Implementation of SemiCircular Bend SCB Test for QCQA of Asphalt Mixtures
    Implementation of Semi-Circular Bend (SCB) Test for QC/QA of Asphalt Mixtures
    Mohammad, Louay ;
    Liu, Jun
    2024-06-01 | PDF
    The growing use of recycled asphalt materials in asphalt pavement poses durability concerns due to the replacement of virgin asphalt binder with recycled binder. The current volumetric-based Superpave mixture design is insufficient in addressing these concerns. To supplement conventional volumetric design, performance-based testing was introduced t ...
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