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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 61 - 80 of 36569 results
  • Conduct Friction Testing Program Data Analysis and Effectiveness of Open Graded Friction Course
    Conduct Friction Testing Program, Data Analysis, and Effectiveness of Open Graded Friction Course
    Biswas, B S Pushpendue ;
    Tarefder, Rafi
    2026-05-25 | PDF
    This report evaluates the use of skid number (SN) data for pavement friction management in New Mexico. The study reviews current pavement friction practices, consolidates historical NMDOT Locked Wheel Skid Trailer (LWST) data, develops roadway class specific SN thresholds, and assesses SN variability, risk, and monitoring adequacy. SN records were ...
  • Michigan One Point Cone Test for Evaluating the Density of OpenGraded Drainage Course OGDC Materials
    Michigan (One Point) Cone Test for Evaluating the Density of Open-Graded Drainage Course (OGDC) Materials
    Congress, Surya S. C. ;
    Cetin, Bora
    2026-05-15 | PDF
    Pavement infrastructure is a significant public investment (over $60 billion annually in the U.S.), yet 39% of major roads are in poor condition, resulting in costly repairs and user expenses. Maximizing pavement longevity is critical to address a projected $684 billion funding gap in road maintenance, and improving compaction quality in pavement b ...
  • COVID and Traffic CrashesImpact on Safety Targets
    COVID and Traffic Crashes/Impact on Safety Targets
    Savolainen, Peter T. ;
    Gates, Timothy J.
    2026-05-14 | PDF
    The COVID-19 pandemic resulted in substantial disruptions to travel behavior and transportation systems across the United States. While traffic volumes declined sharply during the early stages of the pandemic, many jurisdictions experienced increases in traffic fatalities and serious injuries. Understanding the factors contributing to these changes ...
  • 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 ...
  • 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.
  • 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 ...
  • Wet Pond Modeling for Contaminant Retention and Maintenance
    Wet Pond Modeling for Contaminant Retention and Maintenance
    Herb, William ;
    Natarajan, Poornima
    2026-05-01 | PDF
    We have found that many ponds are stratified at 0.3m (1ft) depth, often resulting in a bottom region of low dissolved oxygen water and thereby causing the pond to release phosphorus trapped in the bottom sediments back into the water column. It is critical to maintain treatment capacity to reduce pollution to downstream priority waters. This resear ...
  • 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 ...
  • Development of a New VisionEval Land Use Model and Applications to Evaluate Climate Strategies in Oregon
    Development of a New VisionEval Land Use Model and Applications to Evaluate Climate Strategies in Oregon
    Wang, Liming ;
    Gregor, Brian
    2026-05-01 | PDF
    This project upgraded the land use module for the VisionEval framework to enhance the evaluation of integrated transportation and land use policies and their impacts. The project developed a new strategic land use model utilizing NHTS and Smart Location Database data from 2011 and 2019, applying advanced statistical and machine learning methods to ...
  • 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 ...
  • Automated Methods for Correcting ODOTs RealTime GNSS Network for Survey and PostDisaster Recovery
    Automated Methods for Correcting ODOT’s Real-Time GNSS Network for Survey and Post-Disaster Recovery
    Simpson, Chase ;
    Ohene, William
    2026-05-01 | PDF
    The Oregon Real-Time GNSS Network (ORGN), managed by the Oregon Department of Transportation, serves as a critical backbone for high-precision positioning services across the state. However, the absence of a streamlined workflow for aligning ORGN station coordinates to the National Spatial Reference System (NSRS) has introduced challenges in consis ...
    Supporting Files
  • Alternative Deicer Performance Characterization Know Before the Snow Addendum
    Alternative Deicer Performance Characterization: Know Before the Snow (Addendum)
    Druschel, Stephen J.
    2026-05-01 | PDF
    MnDOT has been using alternative deicers (potassium chloride, magnesium chloride, and calcium chloride) to melt road way ice at temperatures colder than sodium chloride can melt it alone. Using alternative deicers in brine form has been a way to leverage treatment techniques at temperatures below 15° F. However, these alternative deicers have not y ...
  • Investigation on Mix Design of Recycled Asphalt Pavement RAP Materials
    Investigation on Mix Design of Recycled Asphalt Pavement (RAP) Materials
    Le, Jia-Liang ;
    Marasteanu, Mihai
    2026-05-01 | PDF
    Recycled asphalt pavement (RAP) is widely used in asphalt mixture production because it reduces material cost, conserves natural resources, and improves sustainability in pavement construction. However, increasing RAP content can also introduce compactability issues and weak cracking resistance. For this reason, a better understanding of RAP materi ...
  • 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 ...
  • Performance Evaluation of Flexible Pavements Reinforced With Wicking Geotextiles Built Over Soft Subgrade Soils Project Capsule
    Performance Evaluation of Flexible Pavements Reinforced With Wicking Geotextiles Built Over Soft Subgrade Soils [Project Capsule]
    Abu-Farsakh, Murad Y.
    2026-05-01 | PDF
    The primary objective of the proposed study is to evaluate the potential benefits of incorporating wicking geotextiles (WGs) to enhance the performance of flexible pavements constructed over soft, moisture-susceptible subgrade soils in Louisiana. The study aims to investigate how WGs can enhance the capillary capacity and improve drain aggerate eff ...
  • Operational and Capital Cost Management at Rural and Small Urban Transit Systems
    Operational and Capital Cost Management at Rural and Small Urban Transit Systems
    Walk, Michael J. ;
    Etminani-Ghasrodashti, Roya
    2026-05-01 | PDF
    One of the goals of the public transit system is to provide a high-quality and affordable service while ensuring the system remains cost-efficient. Since the COVID-19 pandemic, public transit systems have experienced substantial changes in passenger ridership, revenue streams, operational costs, and capital costs. In Texas and other regions, rural ...
  • 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 ...
  • 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 ...
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