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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 36022 results
  • Best Practices for Utility Management in the Public Right of Way
    Best Practices for Utility Management in the Public Right of Way
    Sturgill, Roy ;
    Adebiyi, Jeremiah
    2025-11-01 | PDF
    As utility infrastructure increasingly occupies public roadway rights of way (ROWs), Iowa faces growing challenges in coordinating utility installations and managing space efficiently. The lack of standardized oversight across cities, counties, and the Iowa Department of Transportation (DOT) has led to inconsistent practices, disorganized utility p ...
  • 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 ...
  • 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 ...
  • Traffic Safety Facts 2023 Data Summary of Motor Vehicle Traffic Crashes
    Traffic Safety Facts 2023 Data: Summary of Motor Vehicle Traffic Crashes
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2025-10-01 | PDF
    This issue of Traffic Safety Facts presents the most current data on motor vehicle crashes. In 2023 there were an estimated 6,138,359 police-reported traffic crashes when 40,901 people were killed and an estimated 2,442,581 people were injured. Compared to 2022, there was a 4.3-percent decrease in the number of fatalities, and a 2.5-percent increas ...
  • 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
    2025-10-01 | 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 ...
  • 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 ...
  • Modified Fiber Reinforced Concrete Repairs for Corroded Steel Beam Ends
    Modified Fiber Reinforced Concrete Repairs for Corroded Steel Beam Ends
    Provines, Jason T. ;
    Sharifi, Mary
    2025-10-01 | PDF
    One common form of costly bridge maintenance is repairing corroded steel beam ends under leaking joints. Recently, the University of Connecticut and the Connecticut Department of Transportation have developed a practical repair strategy in which shear studs are welded to undamaged sections of the corroded steel beam and then ultra-high-performance ...
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