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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 81 - 100 of 35811 results
  • Alternatives to Motor Fuel Taxes for State DOT Funding
    Alternatives to Motor Fuel Taxes for State DOT Funding
    Dunn, Travis P ;
    Alvarado, Roberto
    2025-11-01 | PDF
    For decades, motor fuel taxes have served as the primary source of revenue for surface transportation infrastructure at both the federal and state levels in the United States. However, the reliability of this funding mechanism is challenged by declining fuel consumption, driven by advancements in vehicle engine efficiency and the growing consumer s ...
  • Development of a Design Methodology for Geosynthetic Reinforced Pavement Using Finite Element Numerical Modeling Technical Summary
    Development of a Design Methodology for Geosynthetic Reinforced Pavement Using Finite Element Numerical Modeling [Technical Summary]
    Abu-Farsakh, Murad Y.
    2025-11-01 | PDF
    This study was completed using finite element (FE) analysis to assess the benefits of using geosynthetic reinforcement in flexible pavements. A comprehensive parametric study was performed to determine the effect of different variables like asphalt layer thickness, base thickness, geosynthetic type and stiffness, and subgrade stiffness for low, med ...
  • Alternatives to Motor Fuel Taxes for State DOT Funding Technical Summary
    Alternatives to Motor Fuel Taxes for State DOT Funding [Technical Summary]
    Dunn, Travis P
    2025-11-01 | PDF
    For decades, motor fuel taxes have served as the primary source of revenue for surface transportation infrastructure at both the federal and state levels in the United States. However, the reliability of this funding mechanism is challenged by declining fuel consumption, driven by advancements in vehicle engine efficiency and the growing consumer s ...
  • Remote Bridge Health Monitoring for Scouring Using CostEfficient Sensing Technology
    Remote Bridge Health Monitoring for Scouring Using Cost-Efficient Sensing Technology
    Yee, Tien ;
    Yang, Jidong J.
    2025-11-01 | PDF
    Bridge scour is a leading cause of hydraulic-related bridge failures, yet current monitoring practices rely on periodic inspections that are insufficient during floods when scour activity accelerates. To address this gap, a low-cost (under $1,000 per unit) remote scour-monitoring system was developed and deployed on two scour critical bridges in Ge ...
  • Reconnecting Communities Recommendations for Caltrans Excess Land
    Reconnecting Communities: Recommendations for Caltrans Excess Land
    Butler, Tamika L. ;
    Ullmann, Leila
    2025-11-01 | PDF
    What changes to policies and procedures at the California Department of Transportation (Caltrans) would increase transfers of agency-owned excess land to California Native American Tribes and groups negatively impacted by freeway development? Using case studies on LandBack and reparations and qualitative research with Caltrans staff and community a ...
  • Augmented Information in the Driving Environment Increasing Pedestrian Safety with Augmented Reality Indicators for Older Adult Drivers in Maine
    Augmented Information in the Driving Environment: Increasing Pedestrian Safety with Augmented Reality Indicators for Older Adult Drivers in Maine
    Brown, Justin R. ;
    Fink, Paul D. S.
    2025-10-31 | PDF
    This report describes the project activities conducted at The University of Maine’s VEMI Lab to address the increasing rate of vehicle-pedestrian collisions within the state of Maine and to improve older adult driving safety. Leveraging VEMI’s experience with virtual reality environments, human-subject research, and the lab’s fully immersive autono ...
  • Develop Methodologies for Reducing Costs in Full Depth Reclamation FDR Project Summary Report
    Develop Methodologies for Reducing Costs in Full Depth Reclamation (FDR) [Project Summary Report]
    Sebesta, Stephen ;
    Kim, Jinho
    2025-10-31 | PDF
    Researchers collected materials from five districts and produced laboratory FDR mixtures using emulsified and foamed asphalt, with and without additive. Researchers performed tests for indirect tensile strength, resilient modulus, unconfined compressive strength, and permanent deformation to evaluate strength and performance-related properties over ...
  • Development of Notional Permit Vehicles for Complex Bridge Ratings in Alabama
    Development of Notional Permit Vehicles for Complex Bridge Ratings in Alabama
    Roszczenko, Rafal ;
    Luszczynska, Aneta K.
    2025-10-30 | PDF
    Notional vehicles are useful in evaluation and rating of existing bridges as well as in design of new bridges. According to current trends, the number of overloaded trucks continues to increase. Alabama Department of Transportation (ALDOT) needs an effective and rational approach to include permit vehicles in the analysis. Therefore, the objective ...
  • Identify Mapping Techniques of Invasive Plant Species Within the MDOT RightofWay
    Identify Mapping Techniques of Invasive Plant Species Within the MDOT Right-of-Way
    Dobson, Richard J. ;
    Brooks, Colin
    2025-10-06 | PDF
    Invasive species can be detrimental to our communities and environment as they can cause economic or environmental harm, including harm to human, animal, or plant health. These species thrive in transportation corridors which can be used to spread into new areas. This project focused on mapping four invasive plant species common reed (Phragmites au ...
  • Reimagining Transportation as a Social Service to Build Resilience and Support Community Power
    Reimagining Transportation as a Social Service to Build Resilience and Support Community Power
    Pearce, Jeannine Marie ;
    Borowski, Elisa
    2025-10-01 | PDF
    This study develops guidance for public transit agencies in Los Angeles, California to better prepare for hazards and address challenges, including climate and safety concerns. Using a community-based participatory research methodology in partnership with the local non-profit organization Climate Resolve, we conducted three listening sessions with ...
  • Field and Lab Evaluation of Compacted Concrete Pavement Mixtures
    Field and Lab Evaluation of Compacted Concrete Pavement Mixtures
    Roesler, Jeffery ;
    Ouellet, Jordan
    2025-10-01 | PDF
    This research evaluated compacted concrete pavement (CCP) constructed on a local road in Jerseyville, Illinois, and developed a future CCP mix based on a recently proposed roller-compacted concrete (RCC) mix design process using a gyratory compactor. The Jerseyville evaluation provided valuable insights into the batching, hauling, paving, compactin ...
  • Phase II High Resolution Digital Elevation Models DEMs and StreetLevel Imagery for Rock Cut Slope Inventory and Rockfall Hazard Rating
    Phase II: High Resolution Digital Elevation Models (DEMs) and Street-Level Imagery for Rock Cut Slope Inventory and Rockfall Hazard Rating
    Admassu, Yonathan
    2025-10-01 | PDF
    Proactive management of geotechnical assets such as rock cut slopes along highways includes performing inventory and evaluating rockfall hazard ratings. Both activities are aimed at helping transportation agencies to proactively monitor and maintain rockfall prone rock cut slopes. Rock cut slope inventory involves locating rock cut slopes and colle ...
  • Incident Management in Interstate Work Zones
    Incident Management in Interstate Work Zones
    Cottrell Jr Benjamin H.
    2025-10-01 | PDF
    Incidents in interstate work zones can create challenges for incident management, especially when temporary traffic barriers and limited shoulder pull-off areas are present. This project identified best practices for incident management in interstate work zones, including strategies to provide for the detection, response, and clearance of incidents ...
  • Mitigating Concentrated Sheet Flow of Water at Ends of Superelevated Curves
    Mitigating Concentrated Sheet Flow of Water at Ends of Superelevated Curves
    Alani, Adam ;
    Roundy, Joshua
    2025-10-01 | PDF
    Superelevated highway transitions experience an area of zero-cross slope as one side of the roadway transitions from a normal crown cross slope to superelevation. These areas of minimal transverse cross slope combined with minimal longitudinal grade can cause an increase in water accumulation on highways, which can increase the likelihood for hydro ...
  • Evaluation of Safety Performance of Rural Roundabouts
    Evaluation of Safety Performance of Rural Roundabouts
    Roy, Shibasish Dutta ;
    Schrock, Steven
    2025-10-01 | PDF
    This study evaluated the safety performance of rural roundabouts in Kansas using before-and-after analysis and comparison group approaches. Study results showed that the anticipated number of injury and fatal crashes significantly decreased after the implementation of isolated rural roundabouts. The before-and-after analysis indicated a reduction o ...
  • NonCantilever Fatigue RemainingLife Simulation Software Using Probabilistic Wind Model for All Counties in Kansas
    Non-Cantilever Fatigue Remaining-Life Simulation Software Using Probabilistic Wind Model for All Counties in Kansas
    Al Shboul, Khalid W ;
    Rasheed, Hayder A.
    2025-10-01 | PDF
    This study presents a comprehensive tool to accurately predict the remaining fatigue life of full-span overhead highway sign support structures subjected to a long and sustained wind fluctuation. Synthetic wind time-histories were developed by superimposing cosine waves over frequencies of 3–300 Hz and randomly generated phase angles. The Kaimal sp ...
  • NonCantilever Fatigue RemainingLife Simulation Software Using Probabilistic Wind Model for All Counties in Kansas Technical Summary
    Non-Cantilever Fatigue Remaining-Life Simulation Software Using Probabilistic Wind Model for All Counties in Kansas [Technical Summary]
    Al Shboul, Khalid W ;
    Rasheed, Hayder A.
    2025-10-01 | PDF
    This study used finite element shape functions to conduct spatial interpolation of wind-speed records for all Kansas counties (Al Shboul et al., 2023). This method considered spatial correlations among boundary sites. Artificial wind-time histories were constructed for each day for the entire 45-year study period, and the number of cycles developed ...
  • Evaluation of Safety Performance of Rural Roundabouts Technical Summary
    Evaluation of Safety Performance of Rural Roundabouts [Technical Summary]
    Roy, Shibasish Dutta ;
    Schrock, Steven
    2025-10-01 | PDF
    The primary goal of this study was to assess how rural roundabouts in Kansas impact roadway safety. The study utilized comparison groups and a before-and after study as well as a thorough benefit-cost analysis to determine the return on investment for roundabouts in rural areas. This research also aimed to assess crash frequency at rural roundabout ...
  • Mitigating Concentrated Sheet Flow of Water at Ends of Superelevated Curves Technical Summary
    Mitigating Concentrated Sheet Flow of Water at Ends of Superelevated Curves [Technical Summary]
    Alani, Adam ;
    Roundy, Joshua
    2025-10-01 | PDF
    This project, which focuses on the hydraulics and drainage geometry at curve transitions, proposes methods to predict where hydroplaning is likely to occur and presents mitigation strategies and recommendations to evaluate the proposed strategies. This study also investigated various design considerations the Kansas Department of Transportation (KD ...
  • Using Advanced Binder Rheological Parameters to Predict Cracking Potential of HotMix Asphalt Mixtures with Modified Binders
    Using Advanced Binder Rheological Parameters to Predict Cracking Potential of Hot-Mix Asphalt Mixtures with Modified Binders
    Al-Qadi, Imad L. ;
    Sulaiman, Abdulgafar O.
    2025-10-01 | PDF
    This study provides insights into the complexities of asphalt binder modifications and their impact on hot-mix asphalt (HMA)cracking potential. An experimental program was developed to assess the cracking potential of HMA from binder characteristics. Various binder types, including polymer-softener-modified binders, were considered. Rheological tes ...
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