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US Transportation Collection

rosaP Repository & Open Science Access Portal

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 301 - 320 of 35753 results
  • Improving Testing Requirements in Item 300 of TxDOT Standard Specification
    Improving Testing Requirements in Item 300 of TxDOT Standard Specification
    Wei, Ziyao ;
    Komaragiri, Satyavati
    2025-06-01 | PDF
    Current test procedures in TxDOT specification Item 300, “Asphalts, Oils, and Emulsions” were reviewed for relevance, applicability, accuracy, and practicality, and recommendations were made for improving the tests and specifications. New test procedures were developed, as identified, to fulfill needed changes. Data for new proposed test procedures ...
  • Development of Operations Management System for Iowa Secondary Road Departments
    Development of Operations Management System for Iowa Secondary Road Departments
    Moore, Brian P ;
    Gray, Bob
    2025-06-01 | PDF
    A management goal in every Secondary Road Department is to optimize the work performance of its employees. To be most effective, everyone in the department needs access to all the information about the soft assets used to do their jobs and effective communications with other staff. While this has long been accomplished via paper records, radios, ph ...
  • Research into Job Classifications for Kentucky Department of Vehicle Regulation Employees
    Research into Job Classifications for Kentucky Department of Vehicle Regulation Employees
    Brown, Mallory ;
    Martin, Andrew
    2025-06-01 | PDF
    The Kentucky Department of Vehicle Regulation (DVR) faces persistent challenges with employee recruitment, retention, and workforce alignment due to outdated job classifications and compensation structures. This study investigates if DVR’s reliance on the general Administrative Specialist job series is warranted given the duties performed by its st ...
  • Development of a Health and Wellness Assessment for KYTC Personnel
    Development of a Health and Wellness Assessment for KYTC Personnel
    Dadi, Gabriel B. ;
    Taherpour, Farshid
    2025-06-01 | PDF
    Highway construction workers operate in high-stress, hazardous settings where they have to perform physically taxing labor in environments where exposure to variable weather conditions, heavy equipment, high volumes of vehicle traffic, and other conditions that induce stress and anxiety are the norm. Up to 70% of workers in this industry have repor ...
  • Assessing SpeedingRelated Crashes in Louisiana to Support to Safe System Approach Brief
    Assessing Speeding-Related Crashes in Louisiana to Support to Safe System Approach [Brief]
    Moomen, Milhan ;
    Rupnow, Tyson
    2025-06-01 | PDF
    The role of vehicle operating speed in traffic crashes is a complex issue, as speeding-related crashes continue to pose significant challenges. Speed greatly impacts both the frequency of crashes and the severity of the resulting injuries. Additionally, excessive speed raises the likelihood of losing control during evasive maneuvers and amplifies c ...
  • Effectiveness of Geosynthetics in SoilAggregate StabilizationEvaluation Using Bender Element Sensor Technology
    Effectiveness of Geosynthetics in Soil/Aggregate Stabilization—Evaluation Using Bender Element Sensor Technology
    Wang, Han ;
    Qamhia, Issam I. A.
    2025-06-01 | PDF
    This report presents laboratory evaluations of the effectiveness of geosynthetics in stabilizing unbound aggregate layers and develops design guidelines for using geosynthetic-stabilized pavements in Illinois. The research focused on quantifying benefits from geosynthetic mechanical stabilization and incorporating those benefits into pavement analy ...
  • Evaluation Tool for Proposed MultiUse Trails
    Evaluation Tool for Proposed Multi-Use Trails
    Moruza, Audrey K ;
    Chen, T. Donna
    2025-06-01 | PDF
    This report describes a screening tool for comparing multi-use trails (MUTs) that could compete for funding from the Virginia Department of Transportation (VDOT) or other state sources. The tool scores, based on selected geographic information system (GIS)-processed factors for which metrics are available by trail segment, are calculated in Excel u ...
  • Evaluate Modify and Adapt the ConcreteWorks Software for Iowas Use Phase II
    Evaluate, Modify, and Adapt the ConcreteWorks Software for Iowa’s Use, Phase II
    Wang, Kejin ;
    Riding, Kyle A
    2025-06-01 | PDF
    This Phase II project contained two parts. Part A focused on the investigation of the characteristics and thermal properties of commonly used slags in Iowa cementitious materials and their effects on adiabatic temperature rise (ATR) in Iowa mass concrete structures. A new hydration model for slag-containing cementitious materials and a three-parame ...
  • 5GEnabled Safe and Robust Deep MultiAgent Reinforcement Learning Framework for CAV Coordination
    5G-Enabled Safe and Robust Deep Multi-Agent Reinforcement Learning Framework for CAV Coordination
    Miao, Fei ;
    Han, Song
    2025-06-01 | PDF
    We address the problem of coordination and control of Connected and Automated Vehicles (CAVs) in the presence of imperfect observations in mixed traffic environment. A commonly used approach is learning-based decision-making, such as reinforcement learning (RL). However, most existing safe RL methods suffer from two limitations: (i) they assume acc ...
    Supporting Files
  • Concept of Operations Active Transportation and Travel Information System
    Concept of Operations: Active Transportation and Travel Information System
    AECOM
    2025-06-01 | PDF
    The Minnesota Department of Transportation (MnDOT)’s 511 Traveler Information System. It describes a concept to improve the provision of traveler information to active transportation users. The concept advocates for the inclusion of traveler information for all transportation modes, emphasizing the needs of active transportation users, including cy ...
  • User Guide Interactive Online Map Value of Dedicated Right of Way
    User Guide: Interactive Online Map: Value of Dedicated Right of Way
    Minnesota. Department of Transportation. Research Services & Library
    2025-06-01 | PDF
    MnDOT research has developed a modeling tool that identifies the bus route segments that would benefit most from the installation of a dedicated right of way (ROW) for buses. Transit service reliability is one of the most requested service improvements. By implementing a transit ROW where needed most, MnDOT can improve transit reliability and bette ...
  • Project Summary Active Transportation and Traveler Information
    Project Summary: Active Transportation and Traveler Information
    Minnesota. Department of Transportation
    2025-06-01 | PDF
    The Minnesota Department of Transportation (MnDOT)’s 511 Traveler Information System. It describes a concept to improve the provision of traveler information to active transportation users. The concept advocates for the inclusion of traveler information for all transportation modes, emphasizing the needs of active transportation users, including cy ...
  • Understanding Risks and Opportunities for Ramp Metering Control in a MixedAutonomy Future
    Understanding Risks and Opportunities for Ramp Metering Control in a Mixed-Autonomy Future
    Stern, Raphael ;
    Zare, Arian
    2025-06-01 | PDF
    Vehicle automation may change traffic flow dynamics. This will also impact the control of traffic flow via infrastructure-based systems such as ramp metering control. In this work the authors investigated the impact that different levels of automation and connectivity will have on ramp metering control, and proposed modifications to existing ramp m ...
  • Update to ARDOT Superpave Gyratory Compaction SGC Specification to Increase Pavement Durability
    Update to ARDOT Superpave Gyratory Compaction (SGC) Specification to Increase Pavement Durability
    Braham, Andrew ;
    Hall, Kevin
    2025-06-01 | PDF
    The primary goal ofTRC2201 was to enhance the durability of asphalt pavements in Arkansas. This was accomplished through two steps: exploring extreme scenarios with lab mixtures and comparing eight field sites. Further analysis was conducted using Pavement ME and a life-cycle cost analysis. In the extreme scenario, air voids decreased as Pb and N l ...
  • Taconite as a LowerCost Alternative High Friction Surface Treatment to Calcined Bauxite for Low Volume Roads in Minnesota
    Taconite as a Lower-Cost, Alternative High Friction Surface Treatment to Calcined Bauxite for Low Volume Roads in Minnesota
    Zanko, Lawrence M. ;
    Marasteanu, Mihai O.
    2025-06-01 | PDF
    Minnesota’s taconite (iron ore) mining industry can provide adequate or comparable skid resistance performance to calcined bauxite in high friction surface treatment (HFST)-type applications. Six pavement test sections approximately 1/10th of a mile (160 meters) in length were established at a low volume road location northwest of Duluth, Minnesota ...
  • Evaluation of Proprietary Rejuvenators
    Evaluation of Proprietary Rejuvenators
    Islam, Tanzila ;
    Vaddy, Poornachandra
    2025-06-01 | PDF
    The scope of this study included a thorough evaluation of the short-term and long-term performance of Spray-on Rejuvenators (SORs) to assess their effectiveness in extending asphalt pavement life. Laboratory testing on cores extracted from field included a modified Bending Beam Rheometer (BBR) to measure creep stiffness at different temperatures (2 ...
  • Analysis of School Bus StopArm Violation Reporting and Enforcement in Minnesota Lessons Learned and Opportunities for Process Improvements
    Analysis of School Bus Stop-Arm Violation Reporting and Enforcement in Minnesota: Lessons Learned and Opportunities for Process Improvements
    Morris, Nichole L. ;
    Kessler, William
    2025-06-01 | PDF
    School bus stop-arm violations represent a direct and serious safety risk to children boarding and exiting school buses. Mitigating these dangerous events with preventative measures, education, and proactive enforcement requires a deep understanding of these events. The goal of this study is to better understand the school bus stop-arm violation re ...
  • Development of a Process to Lower Global Warming Potential of Construction Materials
    Development of a Process to Lower Global Warming Potential of Construction Materials
    Cooper, Michelle A. ;
    Mukherjee, Amlan
    2025-06-01 | PDF
    The objective of this research was to support sustainable procurement of concrete pavements by linking materials-level global warming potential (GWP) to the project level. Infrastructure owners require reliable environmental product declarations (EPDs) and methodologies for integrating GWP into the procurement process to ensure equitable decision-m ...
  • Sustaining Performance of ASRAffected Pavements Effective Practices and Insights
    Sustaining Performance of ASR-Affected Pavements: Effective Practices and Insights
    Bektas, Fatih
    2025-06-01 | PDF
    Alkali-silica reaction (ASR) remains a significant durability concern in concrete pavements, leading to internal cracking, surface deterioration, and loss of ride quality. Although preventive measures have reduced ASR in new construction, pavements built in Minnesota in the 1980s and 1990s continue to exhibit distress. This study evaluates maintena ...
  • Incorporating Sustainability into the Procurement Process Research Summary
    Incorporating Sustainability into the Procurement Process [Research Summary]
    Cooper, Michelle A. ;
    Turgeon, Curtis M.
    2025-06-01 | PDF
    This Research Summary is part of the final deliverable for Report 2025-24, "Development of a Process to Lower Global Warming Potential of Construction Materials."
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