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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 21 - 40 of 36336 results
  • Improving Traffic Signal System Planning Design and Management with BigDataEnhanced ATSPM System
    Improving Traffic Signal System Planning, Design, and Management with Big-Data-Enhanced ATSPM System
    Li, Pengfei (Taylor) ;
    Mattingly, Stephen P.
    2026-04-01 | PDF
    In this project, an ATSPM-in-the-loop simulation framework is developed to introduce the data-driven ATSPM framework into traffic signal planning and design. Literature review on ATSPM and Best practice survey are conducted first. Then the research team explores and documents how to set up two real-world open-source ATSPM systems: Utah-DOT ATSPM sy ...
    Supporting Files
  • Lifecycle Economic and Energy Efficiency Benefits of Managed Lane Corridors in Metro Atlanta
    Lifecycle Economic and Energy Efficiency Benefits of Managed Lane Corridors in Metro Atlanta
    Reichard, William (Will) ;
    Ko, Eunseo
    2026-04-01 | PDF
    This report describes the development of a spreadsheet-based modeling framework for calculating lifecycle economic and energy costs of new Express Lane facilities. The report discusses relevant background information, spreadsheet-based model structures, and development of spreadsheet calculation methodologies. The report also describes the developm ...
  • Evaluation of Impacts Due to a Bridge Closure A Case Study of the Mississippi River Bridges in Arkansas
    Evaluation of Impacts Due to a Bridge Closure: A Case Study of the Mississippi River Bridges in Arkansas
    Hernandez, Sarah ;
    Mitra, Suman
    2026-04-01 | PDF
    The TRC 2303 report presents a comprehensive analysis of the impacts of bridge closures across the Mississippi River in Arkansas, focusing on four key crossings: I-40, I-55, HWY 49, and HWY 82. Prompted by the emergency closure of the I-40 Hernando de Soto Bridge in 2021, the study evaluates both full and partial closures to quantify economic, safe ...
  • Accelerated Innovation Deployment AID Demonstration Project Asset Management Tool for Iowa County Engineers Unpaved Granular Road Modulus
    Accelerated Innovation Deployment (AID) Demonstration Project: Asset Management Tool for Iowa County Engineers – Unpaved Granular Road Modulus
    Moore, Brian P. ;
    White, David J.
    2026-04-01 | PDF
    The objective of this project is to use validated intelligent compaction (VIC) technology to map 1/4 to 1/3 of the unpaved gravel road network across the state of Iowa. This work will be done over 2 summer seasons to be completed in the 3-year time frame set forth in the AID Grant NOFO. The mapping will gather Modulus Values; Road Geometry (x,y,z); ...
  • Secondary Road Implementation of Stiffness Modulus for Unpaved Roads
    Secondary Road Implementation of Stiffness Modulus for Unpaved Roads
    Moore, Brian P. ;
    White, David J.
    2026-04-01 | PDF
    The objective of this to create a new application, similar to those already in use at the Service Bureau (SB) that the county engineers are accustomed to using. That application would be developed by the current SB programmers. Once completed all data collected across the State of Iowa by the mapping process including modulus values would be proces ...
  • Implementation of Balanced Mix Design Methods in Oregon to Meet LongTerm Performance Goals
    Implementation of Balanced Mix Design Methods in Oregon to Meet Long-Term Performance Goals
    Coleri, Erdem ;
    Sukhija, Mayank
    2026-04-01 | PDF
    This study presents the development and implementation of a Balanced Mix Design (BMD) framework customized for Oregon’s materials, traffic, and climate conditions, aiming to improve asphalt pavement durability, environmental performance, and cost-effectiveness. While traditional volumetric mix designs have been widely adopted, they may sometimes le ...
  • Guidance for LeftTurn Flashing Yellow Arrow FYA Implementation in Nebraska
    Guidance for Left-Turn Flashing Yellow Arrow (FYA) Implementation in Nebraska
    Khattak, Aemal J. ;
    Zhao, Li
    2026-04-01 | PDF
    This research evaluates the safety performance of flashing yellow arrows (FYA) and driver behavioral responses in Nebraska, using data from 324 FYA intersections (Lincoln 160; Omaha 164) to develop evidence-based implementation guidance. The study addresses critical knowledge gaps in local driver acceptance patterns, the effectiveness of phasing co ...
  • Effectiveness of Temporary Portable Rumble Strips on Work Zones
    Effectiveness of Temporary Portable Rumble Strips on Work Zones
    Macfarlane, Gregory S. ;
    Schultz, Grant G.
    2026-04-01 | PDF
    This study evaluates the effectiveness and operational implications of Temporary Portable Rumble Strips (TPRS) used by the Utah Department of Transportation (UDOT) to alert drivers to upcoming work zones. While TPRS are intended to capture driver attention and reduce crash risk, concerns remain regarding their influence on driver behavior, avoidanc ...
  • Update of IntersectionInterchange Guidelines for Rural Expressways in Nebraska
    Update of Intersection/Interchange Guidelines for Rural Expressways in Nebraska
    Khattak, Aemal J. ;
    Haque, M.M. Shakiul
    2026-04-01 | PDF
    Nebraska Department of Transportation (NDOT) staff frequently decide on changes to existing two-way stop controlled (TWSC) intersections on rural expressway to alternative facilities, such as a restricted crossing U-turn (RCUT), a roundabout, a signalized intersection, or an interchange. As Nebraska makes progress toward completion of its express w ...
  • UltraHighPerformance Concrete UHPC for Bridge Deck Overlay and Structural Deck Repair
    Ultra-High-Performance Concrete (UHPC) for Bridge Deck Overlay and Structural Deck Repair
    Hu, Jiong ;
    Morcous, George
    2026-04-01 | PDF
    Ultra-high-performance concrete (UHPC) is an advanced cementitious material known for its exceptional strength and durability, making it an ideal material for bridge deck overlays and repairs that address the common issue of premature deck deterioration. Conventional UHPC is typically flowable and self-leveling, which makes it unsuitable for deck s ...
  • Evaluation of RAP Fractionation and Its Impact on Mixture Performance Project Capsule
    Evaluation of RAP Fractionation and Its Impact on Mixture Performance [Project Capsule]
    Salari, Saman
    2026-04-01 | PDF
    This research proposal has five primary objectives: 1. Quantify the impact of RAP aggregate quality on overall mixture performance. 2. Investigate the influence of milling depth on RAP quality and its subsequent effect on mixturedurability.3. Evaluate the effectiveness of RAP fractionation in reducing the performance variability commonly associated ...
  • Surface Mixtures Incorporating Recycled Plastic and High Reclaimed Asphalt Pavement Contents 2022 and 2023 Field Trials
    Surface Mixtures Incorporating Recycled Plastic and High Reclaimed Asphalt Pavement Contents: 2022 and 2023 Field Trials
    Habbouche, Jhony ;
    Diefenderfer, Stacey D.
    2026-04-01 | PDF
    Like many other state highway agencies, the Virginia Department of Transportation is extensively working to consider how to best incorporate recycled materials—such as recycled plastic, reclaimed asphalt pavement (RAP) at higher contents with and without the use of recycling agents (RAs), and other materials—into their roads while maintaining or im ...
  • The Costs of Traveling With Children Transportation Challenges for LowIncome Families Policy Brief
    The Costs of Traveling With Children: Transportation Challenges for Low-Income Families [Policy Brief]
    Butler, Tamika L. ;
    Wander, Madeline
    2026-04-01 | PDF
    This policy brief is drawn from “Transportation Challenges of Low-Income Households with Children: A Case Study in South Los Angeles,” published in the Journal of Planning Education and Research, with funding received by the University of California Institute of Transportation Studies through the Road Repair and Accountability Act of 2017(Senate Bi ...
  • Hydrologic Approaches to Playa Lakes Areas of Significant Karst Geology and Arid Regions Appendix C
    Hydrologic Approaches to Playa Lakes, Areas of Significant Karst Geology, and Arid Regions: Appendix C
    Ahmari, Habib ;
    Baharvand, Saman
    2026-04-01 | PDF
    Playa lakes, arid regions, and karst terrains are significant geographic and hydrological features throughout Texas, each posing unique challenges due to their complex and varied hydrology. Currently, there are no standardized guidelines or criteria for the hydrological and hydraulic design of transportation infrastructure in these landscapes, whic ...
  • Hydrologic Approaches to Playa Lakes Areas of Significant Karst Geology and Arid Regions Appendix A
    Hydrologic Approaches to Playa Lakes, Areas of Significant Karst Geology, and Arid Regions: Appendix A
    Ahmari, Habib ;
    Baharvand, Saman
    2026-04-01 | PDF
    The primary objective of this project was to compile and synthesize current knowledge and practices related to hydrological approaches for playa lakes, karst terrains, and arid regions. To achieve this, the project began with a comprehensive evaluation of existing research, design guidance, standards, and practices for hydrological studies in these ...
  • US Department of Transportation Strategic Plan FY 20262030
    U.S. Department of Transportation Strategic Plan: FY 2026-2030
    United States. Department of Transportation
    2026-04-01 | PDF
    This Strategic Plan (or Plan) establishes the U.S. Department of Transportation (Department or DOT) strategic goals and objectives for Fiscal Years (FY) 2026 through 2030. In accordance with the Government Performance and Results Act (GPRA) Modernization Act of 2010, Cabinet-level departments must develop a new Strategic Plan at the beginning of ea ...
  • Hydrologic Approaches to Playa Lakes Areas of Significant Karst Geology and Arid Regions Appendix B
    Hydrologic Approaches to Playa Lakes, Areas of Significant Karst Geology, and Arid Regions: Appendix B
    Ahmari, Habib ;
    Baharvand, Saman
    2026-04-01 | PDF
    The methodology employed to achieve the project’s objective involves a systematic review of design guidance, standards, and recommendations relevant to hydrology and hydraulic design of transportation infrastructure such as drainage and stormwater systems. This involved reviewing various sources, including state departments of transportation draina ...
  • Identifying Road Segments That Bisect Predicted Movement Corridors for Small Priority Species in Virginia
    Identifying Road Segments That Bisect Predicted Movement Corridors for Small Priority Species in Virginia
    Akre, Thomas ;
    Connette, Grant
    2026-04-01 | PDF
    The Virginia General Assembly passed legislation in 2020 requiring the preparation of the Virginia Wildlife Corridor Action Plan. It directed the Virginia Department of Wildlife Resources in collaboration with the Virginia Department of Transportation, the Virginia Department of Conservation and Recreation, and the Virginia Department of Forestry t ...
  • Optimizing the Use of Local Aggregate in StoneMastic Asphalt
    Optimizing the Use of Local Aggregate in Stone-Mastic Asphalt
    Al-Qadi, Imad L. ;
    Mainieri, Javier J. García
    2026-04-01 | PDF
    This study investigated the potential pavement performance, resiliency, cost-effectiveness, and environmental efficiency of incorporating locally sourced Illinois aggregates into stone-mastic asphalt (SMA) through an integrated laboratory and full-scale assessment. SMAs were designed using local aggregates with different lithology and durability le ...
  • Artificial Intelligence for Pavement Condition Assessment From 2D3D Surface Images Technical Summary Report
    Artificial Intelligence for Pavement Condition Assessment From 2D/3D Surface Images [Technical Summary Report]
    Wang, Feng ;
    Gong, Haitao
    2026-03-31 | PDF
    The project started with reviewing the literature of available datasets, established AI models and practices in the U.S. and other countries. The research team investigated the acquisition of high-resolution images with American Association of Highway and Transportation Officials (AASHTO) standard MP47 and created a tool for viewing the vendor’s da ...
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