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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 141 - 160 of 36841 results
  • 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 ...
  • Business Impacts of Access Changes
    Business Impacts of Access Changes
    Gillespie, James S. ;
    Batman, Isaiah E.
    2026-05-01 | PDF
    Some types of geometric improvements that the Virginia Department of Transportation (VDOT) has begun to build in the past two decades, such as the reduction in the number of arterial access points, the replacement of a traditional four-way intersection with a roundabout, or a restricted crossing U-turn, or left-turn prohibitions, have elicited expr ...
  • ShortTerm Field Evaluation of SprayOn Rejuvenators for Asphalt Pavement Preservation
    Short-Term Field Evaluation of Spray-On Rejuvenators for Asphalt Pavement Preservation
    Boz, Ilker ;
    Turochy, Elizabeth
    2026-05-01 | PDF
    Spray-on rejuvenators are pavement preservation treatments intended to mitigate oxidative aging of asphalt binder in the near-surface region of asphalt pavements. Although several highway agencies have evaluated these treatments, reported performance outcomes vary, and the Virginia Department of Transportation (VDOT) has limited documented experien ...
  • Developing a Road Risk Model for Large Animal Crashes in Virginia A Safe System Approach to CostEffective Safety Improvements
    Developing a Road Risk Model for Large Animal Crashes in Virginia: A Safe System Approach to Cost-Effective Safety Improvements
    Hamilton, Ian ;
    Donaldson, Bridget M.
    2026-05-01 | PDF
    In 2020, the Virginia General Assembly enacted the Virginia Wildlife Corridor Action Plan (WCAP; Code of Virginia § 29.1579), which directed the Virginia Department of Transportation (VDOT) and other state agencies to identify wildlife corridors and areas with a high risk of wildlife-vehicle collisions to prioritize wildlife crossing projects that ...
  • The Effect of InStream Construction Activities on Turbidity Suspended Sediment and Sediment Loads
    The Effect of In-Stream Construction Activities on Turbidity, Suspended Sediment, and Sediment Loads
    Lloyd, Lewis N. ;
    Donaldson, Bridget M.
    2026-05-01 | PDF
    Transportation construction activities involving in-stream work can mobilize sediment and elevate turbidity, which can affect sensitive aquatic species such as freshwater mussels. Although cofferdams are used to isolate construction areas and limit sediment mobilization, their installation and removal create some degree of sediment release as a res ...
  • Report 26R39 The Effect of InStream Construction Activities on Turbidity Suspended Sediment and Sediment Loads Research Project Brief
    Report 26-R39: The Effect of In-Stream Construction Activities on Turbidity, Suspended Sediment, and Sediment Loads [Research Project Brief]
    Lloyd, Lewis N. ;
    Donaldson, Bridget M.
    2026-05-01 | PDF
    This study aimed to determine the transport distances of sediment associated with the installation and removal of cofferdams. Related objectives were to (1) compare the impact of cofferdam-related construction events on sediment loads and (2) to document factors that affect recovery times and sediment loads.
  • Report 26R41 Developing a Road Risk Model for Large Animal Crashes in Virginia A Safe System Approach to CostEffective Safety Improvements Research Project Brief
    Report 26-R41: Developing a Road Risk Model for Large Animal Crashes in Virginia: A Safe System Approach to Cost-Effective Safety Improvements [Research Project Brief]
    Hamilton, Ian ;
    Donaldson, Bridget M.
    2026-05-01 | PDF
    The purpose of this study was to develop a predictive model to identify road segments in Virginia at high risk of white-tailed deer- or black bear-vehicle collisions. A related objective was to develop a benefit-cost methodology that complements the predictive model and supports consistent and defensible benefit-cost analyses for large animal-vehic ...
  • Expanding Adaptive Traffic Control Signal Systems A Strategic Study for Louisianas Arterial Highways Project Capsule
    Expanding Adaptive Traffic Control Signal Systems: A Strategic Study for Louisiana’s Arterial Highways [Project Capsule]
    Chauvin, Clark
    2026-05-01 | PDF
    The objective of this research project is to develop a guide for expanding, implementing, maintaining, and evaluating Adaptive Traffic Control Systems (ATCS)in Louisiana. The guide will be grounded in data driven evaluation of existing Louisiana deployments and national best practices, with a focus on practical implementation under DOTD standards 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 ...
  • Spatial and Temporal Load Distribution in Steel Bridge Superstructures Vol II Evaluation of Skewed Steel IGirder Bridge Behavior Under Deck Placement and Live Load Through Field Monitoring and Numerical Simulation
    Spatial and Temporal Load Distribution in Steel Bridge Superstructures (Vol. II): Evaluation of Skewed Steel I-Girder Bridge Behavior Under Deck Placement and Live Load Through Field Monitoring and Numerical Simulation
    Zhou, Siang ;
    Dorado, Ricardo
    2026-05-01 | PDF
    Two skewed (around 45°) two-span continuous bridges with stub abutments or integral abutments were monitored in the field during construction and after the bridges were in service. The goal was to establish a comprehensive understanding of load distribution in skewed steel I-girder bridges and to potentially refine their analysis and design procedu ...
  • Upgrade and Performance Testing of the Benchmark Profiler and the Urban and LowSpeed Profiler
    Upgrade and Performance Testing of the Benchmark Profiler and the Urban and Low-Speed Profiler
    Karamihas, Steven M. ;
    Gilbert, Mark E.
    2026-05-01 | PDF
    This report describes upgrades to the Federal Highway Administration Benchmark Profiler (BP) and the University of Michigan Transportation Research Institute Urban and Low-Speed Profiler (ULSP) and comparison between profiles measured by the two devices. BP and ULSP measurements were compared on six pavement sections at the Illinois Certification a ...
  • 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 ...
  • Seal Coat and Rumble Strip Guidelines Predicting Rumble Strip Noise Performance
    Seal Coat and Rumble Strip Guidelines: Predicting Rumble Strip Noise Performance
    Texas Department of Transportation. Research and Technology Implementation Office  ...
    2026-05-01 | PDF
    In TxDOT research project 0-7029, the research team at the Texas A&M Transportation Institute investigated the impact of sequential seal coats, seal coat grade type, and other factors on rumble strip performance. The key recommendations from the study, presented in this document, can guide TxDOT engineers about whether seal coat should be placed ov ...
  • Report 26R43 Recycled Binder Availability of Virginia RAP Materials and Its Effects on Asphalt Mixture Composition and Performance Research Project Brief
    Report 26-R43: Recycled Binder Availability of Virginia RAP Materials and Its Effects on Asphalt Mixture Composition and Performance [Research Project Brief]
    Kuchiishi, Kazuo ;
    Boz, Ilker
    2026-05-01 | PDF
    Research Objectives: • Characterize the asphalt binder availability, activity, and contribution from RAP materials and corresponding asphalt mixtures. • Evaluate the effectiveness of recycling agents (RAs) for improved blending with virgin binder. • Assess the effect of RBA and RAs on asphalt mixtures volumetrics and performance.
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