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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 221 - 240 of 36336 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 ...
  • Breaking Down Commercial Motor Vehicle Crashes What Are the Main Causes
    Breaking Down Commercial Motor Vehicle Crashes: What Are the Main Causes?
    Ridgeway, Christie ;
    Soccolich, Susan
    2025-11-01 | PDF
    This study examines commercial motor vehicle (CMV) crash severity in Idaho state from 2014–2023 by linking several state and federal databases to create an integrated analysis dataset. After filtering for completeness, 13,701 CMV-involved crashes were modeled using binary logistic regression to estimate the association between temporal, roadway, en ...
  • 2016 2021 Performance Monitoring of MechanisticEmpirical Designed Pavements
    2016 – 2021 Performance Monitoring of Mechanistic-Empirical Designed Pavements
    Illinois. Department of Transportation
    2025-11-01 | PDF
    The Illinois Department of Transportation (IDOT) began conducting pavement performance monitoring surveys on mechanistic-empirical designed pavements in 1986. These surveys and analyses provide the necessary data to verify and validate the design procedures and life-cycle cost models used in the pavement selection process. The pavement distress sur ...
  • Continued Deployment of Indiana Work Zone Analytics Brief
    Continued Deployment of Indiana Work Zone Analytics [Brief]
    Bullock, Darcy M. ;
    Desai, Jairaj
    2025-11-01 | PDF
    Work zones along interstates often have increased congestion and crash rates when locations are close to or over capacity. Having agile monitoring methods to identifying emerging issues and challenges can provide data to transportation agency decision makers to refine maintenance of traffic plans and inform future designs. This study developed tech ...
  • 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 ...
  • 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 ...
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