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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 661 - 680 of 36841 results
  • 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 ...
  • Evaluation of a Density Profiling System for Asphalt Pavement Density Measurement
    Evaluation of a Density Profiling System for Asphalt Pavement Density Measurement
    Diefenderfer, Brian K ;
    Nair, Harikrishnan
    2025-07-01 | PDF
    During asphalt pavement construction, obtaining adequate and uniform density throughout the pavement layer through the compaction process is critical to achieving the desired performance. Optimum pavement density reduces oxidation potential and moisture damage, decreases rutting potential, and improves fatigue life. Numerous national research proje ...
  • Crash Modification Factors for Super 2 Highways
    Crash Modification Factors for Super 2 Highways
    Brewer, Marcus A. ;
    Geedipally, Srinivas R.
    2025-07-01 | PDF
    Super 2 highways have been used across Texas for over 20 years, providing operational and safety benefits to rural two-lane highways at a lower cost than widening such facilities to four lanes. More Super 2 highways are planned as the demand increases on the state highway system. Previous research has provided insights on Super 2 safety, but update ...
  • Mitigation of Cybersecurity Vulnerabilities for Traffic Control Infrastructure
    Mitigation of Cybersecurity Vulnerabilities for Traffic Control Infrastructure
    Kourtellis, Achilleas ;
    Lin, Pei-Sung
    2025-07-01 | PDF
    As transportation systems incorporate computing technology, cybersecurity risks have grown. This project, in collaboration with the Florida Department of Transportation (FDOT) and the Traffic Engineering Research Laboratory (TERL), aims to enhance the security of traffic controllers and related infrastructure by identifying vulnerabilities, develop ...
  • The Service and Ultimate Behavior of BenttoColumn Joints in TxDOT Substructures
    The Service and Ultimate Behavior of Bent-to-Column Joints in TxDOT Substructures
    Wang, Hwa-Ching ;
    Briscoe, Terence J.
    2025-07-01 | PDF
    This research examined the service and ultimate behavior of bridge bent-to-column connections in Texas Department of Transportation (TxDOT) substructures to develop design recommendations for improved structural resilience under extreme events, including flooding, vehicular collision, and loss of column. A three-phase approach was employed. First, ...
  • Human Factors Study to Understand Driver Behavior on Managed Lane Facilities
    Human Factors Study to Understand Driver Behavior on Managed Lane Facilities
    Alluri, Priyanka ;
    Abou-Senna, Hatem
    2025-07-01 | PDF
    The Florida Department of Transportation (FDOT) has several managed lane facilities throughout the state. Managed lanes (MLs) are commonly constructed adjacent to general-purpose lanes (GPLs) to improve mobility. The objective of this research was to understand driver behavior on managed lane facilities, specifically pertaining to the type of separ ...
  • Development of Incident Management Performance Measures Database and Supporting Training Material Summary
    Development of Incident Management Performance Measures Database and Supporting Training Material [Summary]
    Bullock, Darcy M.
    ORCID ICON IMG
    2025-07-01 | PDF
    Secondary crashes resulting from traffic queues are a significant national safety concern. Traffic Incident Management (TIM), which involves coordinated multi-agency response to roadway incidents, is widely recognized as an effective approach to mitigating these crashes. This study aimed to develop a library of after-action case studies to support ...
  • Pragmatic PrecastPrestressed Girder Acceptance Criteria
    Pragmatic Precast/Prestressed Girder Acceptance Criteria
    Stewart, Lauren ;
    Kahn, Lawrence
    2025-07-01 | PDF
    This research addresses the lack of specific, quantitative guidelines within the Georgia Department of Transportation’s (GDOT) Standard Operating Procedure 3 (SOP-3) for evaluating nonconforming precast/prestressed concrete girders. SOP-3 currently provides general recommendations but does not offer objective criteria for acceptance, repair, or rej ...
  • Data Infographics for CTfastrak and the Hartford Line Survey
    Data Infographics for CTfastrak and the Hartford Line Survey
    Cohen, Jeffrey P ;
    Zhou, Songyang
    2025-06-30 | PDF
    This report examines some of the economic and real estate impacts of Connecticut’s CTfastrak and Hartford Line transit systems through a multi-phase, data-driven study. Findings reveal evidence that proximity to transit stations is associated with increased property values, higher property tax revenues, reduced residential and commercial vacancies, ...
  • 07117 StrutandTie Method for Reinforced Concrete Members With Cold Joints Project Summary Report
    0–7117: Strut-and-Tie Method for Reinforced Concrete Members With Cold Joints [Project Summary Report]
    Bayrak, Oguzhan ;
    Li, Brandon
    2025-06-30 | PDF
    Cold joints frequently occur in reinforced concrete structures. However, current design provisions offer limited guidance for assessing their effect on load transfer and failure mechanisms, particularly when cold joints intersect critical load paths in disturbed regions. To address this technical gap, the Texas Department of Transportation (TxDOT) ...
  • Investigate Live Load Distribution and Stability of Prestressed Concrete Girders During Construction
    Investigate Live Load Distribution and Stability of Prestressed Concrete Girders During Construction
    Aliasghar-Mamaghani, Mojtaba ;
    Bjelland, Aiden
    2025-06-30 | PDF
    Prestressed concrete girders are widely used in bridge applications in the state of Texas. While the girders have traditionally been utilized for simply-supported bridges, continuous-girder applications have been used recently by employing spliced-concrete girders that allow significant increases in the spans. However, the larger spans introduce in ...
  • Investigate Live Load Distribution and Stability of Prestressed Concrete Girders Project Summary Report
    Investigate Live Load Distribution and Stability of Prestressed Concrete Girders [Project Summary Report]
    Helwig, Todd ;
    Aliasghar-Mamaghani, Mojtaba
    2025-06-30 | PDF
    The researchers conducted extensive laboratory testing to obtain data on the flexural and torsional stiffness of typical precast girder segments utilized in Texas. Data was obtained in both the uncracked and cracked state considering various combinations of flexure and torsion on the girders. The experiments provided valuable data for validating th ...
  • Engineering Countermeasures to Mitigate Reckless Driving Behavior
    Engineering Countermeasures to Mitigate Reckless Driving Behavior
    Guler, S. Ilgin ;
    Gayah, Vikash V.
    2025-06-24 | PDF
    This project aimed to enhance understanding of the role of reckless driving in traffic safety on Wisconsin roadways and to identify effective countermeasures to mitigate its impact. Reckless driving was defined as crashes involving the following four behaviors: speeding, distracted/drowsy driving, impaired, and aggressive driving. The research bega ...
  • Automated Record Keeping for Maintenance Operations via Tracking of Maintenance Vehicles Using Telematics Tracks
    Automated Record Keeping for Maintenance Operations via Tracking of Maintenance Vehicles Using Telematics Tracks
    Naman, Anugunj ;
    Zhang, Yaguang
    2025-06-24 | PDF
    Efficient and accurate record-keeping for maintenance vehicle operations is essential for optimizing resources, improving accountability, and enhancing decision-making for transportation agencies. The Indiana Department of Transportation (INDOT) sought an automated system to verify and improve work order records using telematics-based vehicle track ...
  • Efficacy of Speed Warning Technologies
    Efficacy of Speed Warning Technologies
    Gates, Timothy J. ;
    Cavka, Magdalena
    2025-06-10 | PDF
    Research was undertaken to determine the effectiveness of various speed warning technologies across a variety of critical speed-change contexts in order to provide guidance to support future installation and operation of such treatments in Michigan. The speed warning technologies evaluated in this research included dynamic speed feedback signs (DSF ...
  • Research and Development of a 3Item Transportation Security Index Mobility Measurement Tool
    Research and Development of a 3-Item Transportation Security Index Mobility Measurement Tool
    Murphy, Alexandra K ;
    Griffin, Jamie
    2025-06-05 | PDF
    Departments of Transportation need measurement tools to (1) assess and track over time populations and geographies where mobility investments are needed, (2) assess what is driving the mobility needs of different populations and geographies so as to identify possible interventions, and (3) evaluate the impact of department investments on mobility. ...
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