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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 241 - 260 of 36368 results
  • 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 ...
  • Equity in Transportation Payments A Study for the California Department of Transportation
    Equity in Transportation Payments: A Study for the California Department of Transportation
    Mata, Stacy ;
    Hamilton, Madi
    2025-10-31 | PDF
    This study identifies equity challenges in current transportation payment systems, specifically for transit, parking, and vehicle tolls. The methodology included comprehensive literature reviews, an inventory of 49 global transit systems, seven case studies, and expert interviews to assess payment accessibility, technical rules, interoperability, a ...
  • 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 ...
  • Connected Vehicle Trajectory Data to Screen Network for HardBraking and HardAcceleration Events
    Connected Vehicle Trajectory Data to Screen Network for Hard-Braking and Hard-Acceleration Events
    Sakhare, Rahul Suryakant ;
    Desai, Jairaj
    2025-10-29 | PDF
    Hard-braking and hard-acceleration data have been demonstrated as an important emerging data source that provides quicker feedback than crash data. In fact, a strong correlation between hard braking on the interstate and crash rates has been reported in previous studies. A previous study has shown that there are approximately 147 hard braking event ...
  • Case Studies Documenting Lessons Learned and Identifying Opportunities for Maintenance of Traffic MOT Improvements
    Case Studies Documenting Lessons Learned and Identifying Opportunities for Maintenance of Traffic (MOT) Improvements
    Overall, Myles W. ;
    Mukai, Justin
    2025-10-28 | PDF
    Over the past 18 months, the team has performed several dozen after-action reviews of interstate work zones and the associated maintenance of traffic (MOT). These after-action reports generally contain the following information: Date, location, visual images, connected vehicle summary graphics, qualitative discussion of activity, and in some cases ...
  • User Manual for Digital Inspection Training System
    User Manual for Digital Inspection Training System
    Hong, Yeji ;
    Zhang, Yuxi
    2025-10-23 | PDF
    Construction inspection plays a pivotal role in ensuring the quality and long-term performance of infrastructure products. INDOT is currently facing the challenge to effectively train novice inspectors and update experienced inspectors with the latest versions of quality requirements to perform construction inspection effectively and more efficient ...
  • Systematic Study of Type 1L Cement for Mixture Optimization and Carbon Reduction
    Systematic Study of Type 1L Cement for Mixture Optimization and Carbon Reduction
    Sung, Jookyeung ;
    He, Rui
    2025-10-21 | PDF
    The use of Portland Limestone Cement (PLC, Type 1L), a sustainable alternative to Ordinary Portland Cement (OPC), has gained traction in the United States as a means to reduce the carbon footprint associated with concrete production. Despite its environmental benefits, the inconsistent field performance, particularly with respect to strength develo ...
  • Refined Bridge Deck Design and Analysis
    Refined Bridge Deck Design and Analysis
    Wang, Xun ;
    Ghoroubi, Rahim
    2025-10-10 | PDF
    Since the 1960’s, bridge live loads (design axle loads) and truck volume have been continuously increasing. Truck loads and wheel configurations that bridge decks are designed for according to the AASHTO LRFD Bridge Design Specifications no longer reflect the modern trucks, not mentioning the larger permit vehicles (e.g., P-15) and new vehicle conf ...
  • 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 ...
  • 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 ...
  • Safety Effectiveness of Inside Shoulder Widths on Freeways in Georgia
    Safety Effectiveness of Inside Shoulder Widths on Freeways in Georgia
    Liu, Jun ;
    Su, Yanfang
    2025-10-01 | PDF
    This report presents a comprehensive analysis of the safety effectiveness of inside (left) shoulder widths on Georgia freeways, conducted as part of Georgia Department of Transportation (GDOT) Research Project 23-22. The study integrates six years (2018–2023) of traffic crash data, traffic volume data (annual average daily traffic [AADT] and truck ...
  • A FollowUp Evaluation of the Concrete Pavements US 58 Rehabilitated in 2012
    A Follow-Up Evaluation of the Concrete Pavements (U.S. 58) Rehabilitated in 2012
    Hossain, M. Shabbir ;
    Ozyildirim, Celik
    2025-10-01 | PDF
    The Virginia Department of Transportation usually rehabilitates old concrete pavements with an asphalt overlay, making them composite pavements. In 2012, a portion of U.S. Route 58 west in Southampton, Virginia, received two additional treatment options: a bonded concrete overlay and an unbonded concrete overlay. Around the same time, the eastbound ...
  • 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 ...
  • 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 ...
  • Bringing Montanas History into the Future Modernizing MDTs Interpretive Marker System
    Bringing Montana’s History into the Future: Modernizing MDT’s Interpretive Marker System
    Villwock-Witte, Natalie ;
    Clouser, Karalyn
    2025-10-01 | PDF
    The Montana Department of Transportation currently administers 295 interpretive markers along the state’s primary and secondary roads and in rest areas along interstates. Historically, travelers could stop to read the interpretive markers. Then, printable guidebooks were created, with some agencies still using these today. With contemporary technol ...
  • 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 ...
  • NondestructiveNoncontact Inspection Protocols and Technologies for Aging Mechanically Stabilized Earth and Modular Block Retaining Walls Volume II
    Nondestructive/Noncontact Inspection Protocols and Technologies for Aging Mechanically Stabilized Earth and Modular Block Retaining Walls, Volume II
    Maghiar, Marcel ;
    Maldonado, Gustavo O.
    2025-10-01 | PDF
    This volume is the second in a series. The other volume in the series is FHWA-GA-25-2217 Volume I. As Mechanically Stabilized Earth and Modular Block retaining walls age within Georgia's highway infrastructure, their stability and safety are critical concerns. Currently, unlike bridges, these retaining walls lack standardized inspection protocols, ...
  • 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 ...
  • 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 ...
  • Systematic and Quantitative Approaches to Assess the Probability of Extreme Weather and Resilience Risks for TxDOT Highways and Bridges
    Systematic and Quantitative Approaches to Assess the Probability of Extreme Weather and Resilience Risks for TxDOT Highways and Bridges
    Birt, Andrew ;
    Prozzi, Jorge
    2025-10-01 | PDF
    This research develops a quantitative framework to assess flood-related risks and resilience for Texas highways and bridges. The study reviewed current practices and gaps, applied GIS-based methods with statewide flood datasets, and evaluated exposure of pavements and bridges across multiple return periods and climate scenarios. Risk assessments qu ...
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