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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 321 - 340 of 36054 results
  • An Economical and Sustainable Dust Suppressant for Gravel Roads
    An Economical and Sustainable Dust Suppressant for Gravel Roads
    Yellavajjala, Ravi Kiran ;
    Hesami, Maedeh
    2025-07-01 | PDF
    Air pollution from fugitive dust poses a significant health risk to the population in rural and arid regions. Conventional chloride-based suppressants offer temporary dust control, leading to soil contamination and infrastructure corrosion. This study proposes the synthesis of a starch-based powder that regenerates into a hydrogel for dust mitigati ...
  • Estimating HCM Default Parameters for Louisiana
    Estimating HCM Default Parameters for Louisiana
    Rahman, M Ashifur ;
    Moomen, Milhan
    2025-07-01 | PDF
    Although the Highway Capacity Manual (HCM) provides default values for its methodologies, it also states that these values represent typical national values and that conditions within a state, region, or community may differ. When default values are applied frequently in analyses, the use of local default values can reduce the uncertainty in the an ...
  • GFRP Reinforced Bridge Barriers Impact Experiment Summary
    GFRP Reinforced Bridge Barriers: Impact Experiment [Summary]
    Wu, Chenglin
    ORCID ICON IMG
    2025-07-01 | PDF
    The reported work includes the experiment testing of glass fiber reinforced polymer (GFRP) and steel reinforced concrete bridge barriers. A total of four reinforced concrete barriers were prepared, including three GFRP reinforced barriers and one mild steel reinforced barrier, and cast on two concrete slabs. Impact testing was conducted using a car ...
  • A Framework for Field Inspection of Inservice FRP ReinforcedStrengthened Concrete Bridge Elements Technical Summary
    A Framework for Field Inspection of In-service FRP Reinforced/Strengthened Concrete Bridge Elements: Technical Summary
    Mehrabi, Armin ;
    Dolati, Seyed Saman Khedmatgozar
    2025-07-01 | PDF
    This document is a technical summary and supplement to the Florida International University report, A Framework for Field Inspection of In-Service FRP Reinforced/Strengthened Concrete Bridge Elements (FIU- 800014727), available at https://rosap.ntl.bts.gov/view/dot/73333. The document additionally offers technical findings beyond those provided in ...
  • Return on Investment for Rural DemandResponse Transit in Illinois
    Return on Investment for Rural Demand-Response Transit in Illinois
    Sriraj, P S ;
    Jang, Jin
    2025-07-01 | PDF
    Transit is frequently treated as a financial burden rather than a public investment, where the value is assessed primarily in terms of ridership or farebox recovery. This framing misses a wide range of external benefits, including workforce participation, healthcare access, and local economic activity. Additionally, public discourse and scholarly r ...
  • Develop Design Details for CRCP Whitetopping and Unbonded Overlays
    Develop Design Details for CRCP Whitetopping and Unbonded Overlays
    Koirala, Niwesh ;
    Jabonero, Christopher
    2025-07-01 | PDF
    Existing design methodologies for concrete overlays often rely on outdated empirical approaches or complex mechanistic models that lack adequate field validation. This has resulted in a significant gap in practice, particularly the design of Continuously Reinforced Concrete Pavement (CRCP) overlays, for which no standardized procedure exists in man ...
  • Developing an Enhanced Protection of Median Openings Between Parallel Bridge Structures
    Developing an Enhanced Protection of Median Openings Between Parallel Bridge Structures
    Kovar, James C. ;
    Loza, Alondra
    2025-07-01 | PDF
    The objective of this project was to develop a method to prevent errant motorists from entering the median openings between parallel bridge structures. This project identified characteristics that could be used to target potential sites for implementation of a median opening protection system (MOPS). In this identification process, the research tea ...
  • Development and Use of UltraHighPerformance Concrete UHPC as a High Friction Surface Treatment HFST on Pavements and Bridges
    Development and Use of Ultra-High-Performance Concrete (UHPC) as a High Friction Surface Treatment (HFST) on Pavements and Bridges
    Rangaraju, Prasad ;
    Maeger, Kyle
    2025-07-01 | PDF
    High Friction Surface Treatments (HFST) are proven crash reduction technology. However, their high cost necessitates exploring the use of alternative materials. This study assessed the design and application of Ultra-High-Performance Concrete (UHPC) as an alternative to traditional epoxy resin-based binder for HFST. In addition, the use of local al ...
  • Development of a Continuous for Live Load Prefabricated Steel Accelerated Bridge Construction ABC Unit for Texas Bridges
    Development of a Continuous for Live Load Prefabricated Steel Accelerated Bridge Construction (ABC) Unit for Texas Bridges
    Hurlebaus, Stefan ;
    Yarnold, Matthew T.
    2025-07-01 | PDF
    This research study developed and evaluated prefabricated steel bridges made continuous for live load utilizing accelerated bridge construction (ABC). The project created a steel ABC transverse connection detail at the bridge piers that allows the structure to behave as simply supported for dead load and continuous for live load. This detail is rel ...
  • Smart Selection of Cutting Edges A Practical Guide for Minnesotas Cities and Counties
    Smart Selection of Cutting Edges: A Practical Guide for Minnesota’s Cities and Counties
    Minnesota Local Road Research Board
    2025-07-01 | PDF
    This guide equips public agencies with considerations to select, use, and evaluate cutting edges that deliver the best return on investment. Choosing the right cutting edge for snowplowing or blading gravel roadways is essential to maximize performance, reduce costs, and protect both roads and operators. The best blade depends on surface type, plow ...
  • Geotechnical Database Phase IV
    Geotechnical Database - Phase IV
    Gautreau, Gavin P.
    2025-07-01 | PDF
    This research project expanded on the three previous LTRC geotechnical database efforts to improve and advance geotechnical data management within the Louisiana Department of Transportation and Development. This project facilitated the implementation of Bentley’s OpenGround Cloud (OpenGround). The project uploaded historical boring log images and d ...
  • Select High Risk Pedestrian Midblock Crossings and Perform Safety Evaluations for Developing Pedestrian Crossings
    Select High Risk Pedestrian Midblock Crossings and Perform Safety Evaluations for Developing Pedestrian Crossings
    Sharif, Hatim O. ;
    Joseph, John
    2025-07-01 | PDF
    Pedestrian fatalities on high-speed, multi-lane roads in Texas, particularly in San Antonio, Houston, and Dallas, highlight an urgent need for focused interventions at midblock crossings. These sites often serve vulnerable populations and connect neighborhoods to transit, retail, and essential services, yet their safety challenges are magnified by ...
  • Evaluation Of Concrete Bridge Deck Mixtures Using ShrinkageRing Tests
    Evaluation Of Concrete Bridge Deck Mixtures Using Shrinkage-Ring Tests
    Perez Buenfil, Shamel ;
    Higgins, John
    2025-07-01 | PDF
    The durability of concrete structures is dependent on the restrained shrinkage behavior of the mix: therefore, evaluating mixtures with different aggregates and mitigation measures is critical. The aim of this document is to evaluate and compare concrete mixture designs using granite and limestone aggregates in combination with different mitigation ...
  • NPS National Transit Inventory and Performance Report 2024
    NPS National Transit Inventory and Performance Report, 2024
    United States. Department of the Interior. National Park Service. Washington Area Support Office
    2025-07-01 | PDF
    The 2024 NPS Transit Inventory and Performance Report communicates the service-wide outcomes and status of National Park Service (NPS) transit systems. This comprehensive listing has been compiled annually in this format since 2012 and covers on- and off-road, waterborne, and airborne systems. The inventory establishes a working definition of NPS t ...
  • Iowa Highway Research Board 20002024
    Iowa Highway Research Board: 2000–2024
    Gieseman, Oksana ;
    Hallmark, Shauna
    2025-07-01 | PDF
    The Highway Division of the Iowa Department of Transportation (Iowa DOT) engages in research and development for two reasons: first, to find workable solutions to the many problems that require more than ordinary, routine investigation; and second, to identify and implement improved engineering and management practices. Detailed information on each ...
  • Impact of Pavement Friction on Traffic Safety Phase 1 Pavement Friction Evaluation
    Impact of Pavement Friction on Traffic Safety, Phase 1: Pavement Friction Evaluation
    Smadi, Omar G. ;
    Alhasan, Ahmad
    2025-07-01 | PDF
    The primary objectives of the proposed study are listed below: (1) To identify the possible procedures and a list of candidate continuous friction measurement equipment (CFME) technologies to evaluate pavement friction at different test speeds and operational conditions. (2) To assess the feasibility and possible benefits from the list of candidate ...
  • A Management Plan for Historic Bridges in Virginia The 2024 Update
    A Management Plan for Historic Bridges in Virginia: The 2024 Update
    Miller, Ann B.
    2025-07-01 | PDF
    A Management Plan for Historic Bridges in Virginia, published in 2001, identified the management and treatment needs for historic bridges in Virginia (i.e., bridges individually eligible for or listed on the National Register of Historic Places) that were under some measure of state purview. Updates to the plan at 5-year intervals are now required ...
  • Deck Reinforcement Detailing and Concrete Mix Additives to Reduce Bridge Deck Cracking
    Deck Reinforcement Detailing and Concrete Mix Additives to Reduce Bridge Deck Cracking
    Hedegaard, Brock D. ;
    Gibson, Eric
    2025-07-01 | PDF
    Despite recent changes to MnDOT mix designs, transverse cracking has still been observed shortly after the bridge deck is poured. The goal of this research was to determine the causes of this cracking and to propose deck reinforcement or mix design practices that efficiently mitigate the problem. Initial investigations focused on synthesizing exist ...
  • Developing Snow Performance Measures for Public Information
    Developing Snow Performance Measures for Public Information
    Khanal, Shailendra ;
    Singleton, Patrick A.
    2025-07-01 | PDF
    This research examines public satisfaction with winter road maintenance (WRM) and transportation behaviors during snow events in Utah, with the goal of informing more transparent, responsive, and data-driven strategies and public communication. A detailed online survey of 568 residents across six distinct geographic zones captured public perception ...
  • Winter Severity Index with Winter Maintenance Expenses and Material Usage
    Winter Severity Index with Winter Maintenance Expenses and Material Usage
    Zockaie, Ali ;
    Fadaei, Ardeshir
    2025-07-01 | PDF
    Effective winter road maintenance is crucial for safe travel and represents a substantial portion of the Michigan Department of Transportation’s (MDOT) annual budget. A primary challenge in winter operations is resource allocation for different winter maintenance materials, due to the substantial variability in winter weather conditions across Mich ...
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