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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 21 - 40 of 36368 results
  • InService Evaluation of Temporary Sign Support Systems Against Wind Load
    In-Service Evaluation of Temporary Sign Support Systems Against Wind Load
    Beojone, Caio V. ;
    Pallab, Nazmus S.
    2026-05-01 | PDF
    This short study analyzes the performance of multiple temporary sign support systems under windy conditions and provides recommendations to the Bureau of Safety Programs and Engineering of the Illinois Department of Transportation (IDOT). The efforts included a literature review that summarizes past studies on the use of temporary sign support syst ...
  • Traffic Safety Culture Transportation Pooled Fund Outreach Materials
    Traffic Safety Culture Transportation Pooled Fund Outreach Materials
    Green, Kelly ;
    Finley, Kari
    2026-05-01 | PDF
    This project supported the Traffic Safety Culture Transportation Pooled Fund (TSC-TPF) by developing outreach materials and a communication plan to improve the dissemination and use of research findings. Using the Improving Pedestrian Safety project as a pilot, the project team created a concise project summary, audience-specific speaking points, a ...
  • Development of a Pavement Friction Management Program
    Development of a Pavement Friction Management Program
    Hu, Run ;
    Maia, Renan Santos
    2026-05-01 | PDF
    This project aims to develop a comprehensive framework for statewide pavement friction management and safety-oriented decision-making for IDOT. The project was structured into several key tasks. First, a literature review was conducted to synthesize existing research on pavement friction measurement, friction-crash relationships, investigatory leve ...
  • Implementation of AASHTOWare Pavement ME Design Software for the Kansas Department of Transportation
    Implementation of AASHTOWare Pavement ME Design Software for the Kansas Department of Transportation
    Wu, Xingdong ;
    Gao, Ya
    2026-05-01 | PDF
    The AASHTOWare Pavement ME Design (PMED) software uses the mechanistic-empirical pavement design approach. PMED prediction models need to be calibrated to local conditions to produce accurate, reliable pavement performance predictions. Previously, multiple efforts were made to locally calibrate performance models in Kansas across various AASHTOWare ...
  • Initial Analytical Investigation of Cantilever and Butterfly Steel Overhead Sign Trusses With Respect to Remaining Fatigue Life
    Initial Analytical Investigation of Cantilever and Butterfly Steel Overhead Sign Trusses With Respect to Remaining Fatigue Life
    Al Shboul, Khalid W ;
    Rasheed, Hayder A.
    2026-05-01 | PDF
    Fatigue failure of highway sign structures due to sustained wind-loading events has been recognized in many states. In fact, the American Association of State Highway and Transportation Officials specifies that the structural component should be designed for infinite life by maintaining wind-induced stress below their constant amplitude fatigue thr ...
  • Do Cities Have Too Much Parking Brief
    Do Cities Have Too Much Parking? [Brief]
    Schwartz, Ellen
    2026-05-01 | PDF
    Urban land is a limited resource, and allocating it to infrastructure devoted to storing motor vehicles — parking — reduces the amount of space available for other priorities, including housing, economic development, and green space. This issue brief synthesizes research on the large share of land devoted to parking in urban areas, the large share ...
  • Implementation of AASHTOWare Pavement ME Design Software for the Kansas Department of Transportation Technical Summary
    Implementation of AASHTOWare Pavement ME Design Software for the Kansas Department of Transportation [Technical Summary]
    Wu, Xingdong ;
    Gao, Ya
    2026-05-01 | PDF
    This study was initiated to revise the local calibration factors for version 2.6.2, released in September 2022. Another objective was to find any significant changes between the two versions that might affect the performance prediction. Also, several issues related to input material characteristics were studied.
  • Effects of Reheating and Mixture Composition on Balanced Mix Design Test Results
    Effects of Reheating and Mixture Composition on Balanced Mix Design Test Results
    Kuchiishi, Kazuo ;
    Boz, Ilker
    2026-05-01 | PDF
    Since 2019, the Virginia Department of Transportation (VDOT) has conducted several field trials with balanced mix design (BMD) mixtures. In 2024, these efforts culminated with the statewide application of VDOT’s BMD specification to all 9.5-and 12.5-mm surface mixtures with A and D designations in maintenance resurfacing contracts. Several Virginia ...
  • Report 26R42 Effects of Reheating and Mixture Composition on Balanced Mix Design Test Results Research Project Brief
    Report 26-R42: Effects of Reheating and Mixture Composition on Balanced Mix Design Test Results [Research Project Brief]
    Kuchiishi, Kazuo ;
    Boz, Ilker
    2026-05-01 | PDF
    Significant and practical differences in balanced mix design (BMD) test results have been reported in past VTRC research projects between samples or lots of the same mix or between districts and producers. These differences can be attributed to the variability in reheating practices and asphalt mixture composition during production. This study help ...
  • Pilot Project No 2 Use of Small Uncrewed Aircraft Systems for Gravel Road Monitoring
    Pilot Project No. 2 – Use of Small Uncrewed Aircraft Systems for Gravel Road Monitoring
    Oguntoye, Kunle ;
    Sourav, Md Abdullah All
    2026-05-01 | PDF
    According to the United States Department of Transportation (USDOT), gravel roads account for more than 30% of the total road network in the United States. Although these roads typically carry low volumes of traffic, they play a critical role in transporting goods, providing access to essential services, and connecting to larger highway systems. A ...
  • Demonstrating the Use of Small Uncrewed Aircraft Systems Drones Capabilities and Data for Iowa Transportation and Infrastructure Work Pilot Project No 3 Use of Small Uncrewed Aircraft Systems for Erosion and Sediment Control Device Monitoring
    Demonstrating the Use of Small Uncrewed Aircraft Systems (Drones) Capabilities and Data for Iowa Transportation and Infrastructure Work: Pilot Project No. 3 – Use of Small Uncrewed Aircraft Systems for Erosion and Sediment Control Device Monitoring
    Oguntoye, Kunle ;
    Sourav, Md Abdullah All
    2026-05-01 | PDF
    Erosion and sediment control devices (ESCDs) are commonly installed on construction projects to mitigate the effects of runoff and sediment transport in downstream environments. Regulatory agencies such as the U.S. Environmental Protection Agency require these devices to be frequently inspected and maintained promptly when deficiencies are observed ...
  • Local Roads Research Forum Under TPF5495 2023 Technology Exchange on Low Volume Road Design Construction and Maintenance
    Local Roads Research Forum Under TPF-5(495) 2023 Technology Exchange on Low Volume Road Design, Construction and Maintenance
    Bos, Colleen ;
    Seeber, Kirsten
    2026-05-01 | PDF
    The 2023 Technology Exchange on Low Volume Road Design, Construction and Maintenance pooled fund (TPF-5(495)) hosted a Local Roads Research Forum on March 3 and 4, 2026, with the Iowa Department of Transportation coordinating as lead state in partnership with the Iowa County Engineers Association Service Bureau. The purpose of this forum was to hel ...
  • Pavement Markings Retroreflectivity Enhancing Traffic Safety Project Capsule
    Pavement Markings Retroreflectivity: Enhancing Traffic Safety [Project Capsule]
    Dwyer, Carmine E. ;
    Codjoe, Julius
    2026-04-13 | PDF
    The objectives of the project are to: 1. Develop cost-efficient recommendations for maintaining marking retroreflectivity at or above minimum levels on Louisiana state highways; 2. Improve understanding of pavement striping practices and material performance factors that influence the durability and long-term retroreflectivity of pavement markings; ...
  • Report R26R37 Identifying Road Segments That Bisect Predicted Movement Corridors for Small Priority Species in Virginia Research Project Brief
    Report R26-R37: Identifying Road Segments That Bisect Predicted Movement Corridors for Small Priority Species in Virginia: Research Project Brief
    Akre, Thomas ;
    Connette, Grant
    2026-04-01 | PDF
    The purpose of this study was to advance the objectives of the legislated WCAP by developing species-specific road risk models and identifying road segments that pose a high risk to small priority species. The study also highlighted potential approaches to improving road-crossing connectivity based on species-specific movement corridors and road ri ...
  • 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 ...
  • 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 ...
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