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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 221 - 240 of 35438 results
  • Effect of SARA Asphalt Binder Fractionations on Laboratory Performance of Asphalt Mixtures Project Capsule
    Effect of SARA Asphalt Binder Fractionations on Laboratory Performance of Asphalt Mixtures [Project Capsule]
    Mohammaed, Louay ;
    Akentuna, Moses
    2025-06-01 | PDF
    The objective of this study is to evaluate the influence of asphalt binders possessing the same Performance Grade (PG) but differing in chemical composition as characterized by SARA fraction percentages on the mechanical performance of asphalt mixtures across high, intermediate, and low temperatures. Two sets of laboratory experiments will be condu ...
  • Groundwater Flooding on Highways in the Nebraska Sandhills Applying Remote Sensing Precipitation and Groundwater Modeling to Determine Depth Cause and Frequency
    Groundwater Flooding on Highways in the Nebraska Sandhills: Applying Remote Sensing, Precipitation and Groundwater Modeling to Determine Depth, Cause and Frequency
    Mittelstet, Aaron
    2025-06-01 | PDF
    Climate change significantly impacts infrastructure sustainability, particularly through shifts in precipitation patterns, intensity, and duration. These precipitation dynamics may increase the occurrence of surface water and groundwater flooding. Groundwater in the Nebraska Sand Hills (NSH), including the thickest portions of the High Plains Aquif ...
  • NMDOT Pedestrian Outreach Program
    NMDOT Pedestrian Outreach Program
    Ferenchak, Nicholas N. ;
    Lucaci, Ana M
    2025-06-01 | PDF
    This research report reviews best practices in pedestrian outreach and engagement from various state, regional, and city agencies that will guide pedestrian outreach for the New Mexico Department of Transportation (NMDOT) Pedestrian Safety Action Plan (PSAP). This report summarizes insights from interviews with government personnel overseeing pedes ...
  • Beyond Copenhagen Walking and Cycling Success Stories from Cities Worldwide
    Beyond Copenhagen: Walking and Cycling Success Stories from Cities Worldwide
    Millard-Ball, Adam ;
    Reginald, Monisha
    2025-06-01 | PDF
    The potential for walking and cycling and related modes such as wheelchairs which we call “active transportation” throughout this playbook—to take center stage is demonstrated in cities worldwide. Amsterdam and Copenhagen are known to tourists and urban planners worldwide for their bicycle infrastructure. Throngs of pedestrians are a hallmark of po ...
  • 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 ...
  • 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 ...
  • Nebraska Balanced Mix Design Phase II
    Nebraska Balanced Mix Design – Phase II
    Yazdipanah, Farzad ;
    Khedmati, Mahdieh
    2025-05-31 | PDF
    This study aimed to propose a performance-based framework to evaluate highly recycled asphalt mixtures containing polymer-modified binders for potential use in a balanced mix design (BMD) specification in the state of Nebraska. For that, loose and compacted mixtures were directly collected from plant and field projects within a benchmarking study, ...
  • Effectiveness Monitoring of CTDOT Conservation Areas Pollinator Habitat Survey
    Effectiveness Monitoring of CTDOT Conservation Areas: Pollinator Habitat Survey
    Legrand, Ana
    2025-05-31 | PDF
    A pollinator habitat survey project was conducted in 2023 and 2024 to determine the effectiveness of CTDOT reduced mowing and late season mowing practices in designated conservation areas. The project evaluated the presence of milkweed resources for monarch butterflies and of nectar resources for pollinators in general. The Candidate Conservation A ...
  • Study the Impacts of Caltrans Thermoplastic Stripe Markings and Pavement Markers to Microplastic Pollution and Develop Potential Solutions
    Study the Impacts of Caltrans Thermoplastic Stripe, Markings and Pavement Markers to Microplastic Pollution and Develop Potential Solutions
    Asvapathanagul, Pitiporn ;
    Gedalanga, Philip
    2025-05-31 | PDF
    Microplastic (MP) pollution has emerged as a critical environmental concern due to its pervasive presence and harmful impacts on human and environmental health. MPs, defined as plastic particles ranging from 1 nm to 5 mm, are problematic because of their ability to disperse widely across ecological habitats. Recent studies have illuminated roadways ...
  • California Partners for Advanced Transportation Technology PATH Research Program Management
    California Partners for Advanced Transportation Technology (PATH) Research Program Management
    Fishelson, James ;
    Moura, Scott
    2025-05-29 | PDF
    California Partners for Advanced Transportation Technology (PATH) was founded in 1986, as a partnership between the California Department of Transportation (Caltrans) and the University of California. PATH is a statewide research program in Intelligent Transportation Systems (ITS) focusing on improving safety, system performance, accessibility, and ...
  • Evaluation of Mobile Robot Teams for Security of Caltrans Equipment Yards and Maintenance Stations
    Evaluation of Mobile Robot Teams for Security of Caltrans Equipment Yards and Maintenance Stations
    Sisi, Saeid Delshad ;
    Linke, Barbara
    2025-05-20 | PDF
    The California Department of Transportation (Caltrans) owns many medium-to-large equipment yards and maintenance stations. Vehicles are often stored in these fenced and secure yards. However, Caltrans still experiences vehicle component theft from these yards. In recent years, there has been a significant increase in theft at Caltrans facilities. T ...
  • Waterline Pile Cap Footings for Bridges Using Large Diameter FRP Reinforcing Material Characterization and Design
    Waterline Pile Cap Footings for Bridges Using Large Diameter FRP Reinforcing – Material Characterization and Design
    Nanni, Antonio ;
    De Caso, Francisco
    2025-05-13 | PDF
    The durability of coastal bridge structures is significantly impacted by the corrosion of steel reinforcement, particularly in waterline pile cap footings exposed to aggressive marine environments. This study investigates the feasibility of using large-diameter glass fiber-reinforced polymer (GFRP) bars as a corrosion-resistant alternative to tradi ...
  • Racial Segregation in Pasadena The Role of Freeway Development and Institutional Mechanisms
    Racial Segregation in Pasadena: The Role of Freeway Development and Institutional Mechanisms
    Ong, Paul M ;
    Pech, Chhandara
    2025-05-07 | PDF
    This study documents the historical and current patterns of racial/ethnic residential segregation in Pasadena, examining the role of freeways and other mechanisms in shaping these outcomes. Using quantitative data, this project compares racial segregation in Pasadena with that in the rest of Los Angeles County and analyzes demographic changes in th ...
  • RiskBased MultiThreat DecisionSupport Methodology for LongTerm Bridge Asset Management Volume 2 Networklevel Decision Support
    Risk-Based Multi-Threat Decision-Support Methodology for Long-Term Bridge Asset Management — Volume 2: Network-level Decision Support
    Ghavidel, Alireza ;
    Mashrur, Naqib
    2025-05-03 | PDF
    In the Volume 2 report, the bridge-level AI-based maintenance decision policy previously developed in the Volume 1 report is further integrated into a network-level decision support framework, by considering network-level budget and resource constraints. A Pareto Frontier based ranking approach is proposed to rank the maintenance projects suggested ...
  • Improving MDOTs Movable Bridge Reliability and Operations
    Improving MDOT’s Movable Bridge Reliability and Operations
    Kohler, Jonathan ;
    Longfield, Matt
    2025-05-02 | PDF
    The Michigan Department of Transportation owns and operates twelve movable bridges, comprised of eleven bascule bridges and one vertical-lift bridge. These bridges often have electrical and mechanical component failures or malfunctions which can cause unplanned maintenance, traffic disruptions, and navigational disruptions. This research evaluates ...
  • Improving Maintenance of OpenGraded Friction Course in Louisiana
    Improving Maintenance of Open-Graded Friction Course in Louisiana
    Mayeux, Corey R ;
    Akentuna, Moses
    2025-05-01 | PDF
    Open-Graded Friction Course (OGFC) is a specialized asphalt concrete mixture used for thin-wearing courses, offering significant safety, economic, and environmental benefits. The porous structure of OGFC enhances drainage, reduces hydroplaning, and improves road visibility, particularly during wet weather conditions. Despite its potential advantage ...
  • Evaluation of PostMounted Delineators and Curve Warning Message Markings Phase 1 Designing a Sampling Plan
    Evaluation of Post-Mounted Delineators and Curve Warning Message Markings Phase 1: Designing a Sampling Plan
    Appiah, Justice ;
    Cho, Hyun W.
    2025-05-01 | PDF
    In 2022, the Virginia Transportation Research Council published Guidance for and Effectiveness of Low-Cost Delineation Treatments, a report that evaluated the effectiveness of several low-cost delineation countermeasures (Flintsch et al., 2022a). That report recommended that the Virginia Department of Transportation (VDOT) consider a pilot study of ...
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