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.
Transportation capital investment planning plays a crucial role in shaping infrastructure that supports community growth and well-being. While many studies have examined capital investment decisions within specific jurisdictions, there is limited understanding of how equity is defined, measured, and integrated into these processes more broadly. Thi
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Sarmiento, Camila Fonseca et al. (2025). Advancing Equity in Capital Investment Decision-Making.
Sarmiento, Camila Fonseca et al. "Advancing Equity in Capital Investment Decision-Making" (2025)
Sarmiento, Camila Fonseca et al. "Advancing Equity in Capital Investment Decision-Making" , 2025
Chip seals are a cost-effective pavement preservation treatment widely used by the New Mexico Department of Transportation (NMDOT) to extend pavement life and improve surface performance. Despite their extensive application, NMDOT has not previously adopted a standardized design procedure or construction specification, resulting in variability acro
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Vargas-Nordcbeck, Adriana et al. (2025). Chip Seal for Uniform Usages Across the Districts of NMDOT.
Vargas-Nordcbeck, Adriana et al. "Chip Seal for Uniform Usages Across the Districts of NMDOT" (2025)
Vargas-Nordcbeck, Adriana et al. "Chip Seal for Uniform Usages Across the Districts of NMDOT" , 2025
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
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Bullock, Darcy M. and Desai, Jairaj (2025). Continued Deployment of Indiana Work Zone Analytics [Brief].
Bullock, Darcy M. and Desai, Jairaj "Continued Deployment of Indiana Work Zone Analytics [Brief]" (2025)
Bullock, Darcy M. and Desai, Jairaj "Continued Deployment of Indiana Work Zone Analytics [Brief]" , 2025
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
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Illinois. Department of Transportation (2025). 2016 – 2021 Performance Monitoring of Mechanistic-Empirical Designed Pavements.
Illinois. Department of Transportation "2016 – 2021 Performance Monitoring of Mechanistic-Empirical Designed Pavements" (2025)
Illinois. Department of Transportation "2016 – 2021 Performance Monitoring of Mechanistic-Empirical Designed Pavements" , 2025
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
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Ridgeway, Christie et al. (2025). Breaking Down Commercial Motor Vehicle Crashes: What Are the Main Causes?.
Ridgeway, Christie and Soccolich, Susan and Camden, Matthew C. "Breaking Down Commercial Motor Vehicle Crashes: What Are the Main Causes?" (2025)
Ridgeway, Christie et al. "Breaking Down Commercial Motor Vehicle Crashes: What Are the Main Causes?" , 2025
This study examines how asphalt mixtures change over time and how their performance is influenced by material selection and environmental factors. Thirty-six asphalt mixes produced in Oklahoma were collected and tested to understand their behavior in terms of cracking, rutting, moisture damage, and compaction. The work focuses on how aging affects
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Elkashef, Mohamed et al. (2025). Investigating the Aging Behavior of Asphalt Binders at Different Production Stages and During the Service Life of the Pavement.
Elkashef, Mohamed et al. "Investigating the Aging Behavior of Asphalt Binders at Different Production Stages and During the Service Life of the Pavement" (2025)
Elkashef, Mohamed et al. "Investigating the Aging Behavior of Asphalt Binders at Different Production Stages and During the Service Life of the Pavement" , 2025
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
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Brown, Justin R. et al. (2025). Augmented Information in the Driving Environment: Increasing Pedestrian Safety with Augmented Reality Indicators for Older Adult Drivers in Maine.
Brown, Justin R. et al. "Augmented Information in the Driving Environment: Increasing Pedestrian Safety with Augmented Reality Indicators for Older Adult Drivers in Maine" (2025)
Brown, Justin R. et al. "Augmented Information in the Driving Environment: Increasing Pedestrian Safety with Augmented Reality Indicators for Older Adult Drivers in Maine" , 2025
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
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Sebesta, Stephen et al. (2025). Develop Methodologies for Reducing Costs in Full Depth Reclamation (FDR) [Project Summary Report].
Sebesta, Stephen et al. "Develop Methodologies for Reducing Costs in Full Depth Reclamation (FDR) [Project Summary Report]" (2025)
Sebesta, Stephen et al. "Develop Methodologies for Reducing Costs in Full Depth Reclamation (FDR) [Project Summary Report]" , 2025
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
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Mata, Stacy et al. (2025). Equity in Transportation Payments: A Study for the California Department of Transportation.
Mata, Stacy et al. "Equity in Transportation Payments: A Study for the California Department of Transportation" (2025)
Mata, Stacy et al. "Equity in Transportation Payments: A Study for the California Department of Transportation" , 2025
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
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Roszczenko, Rafal et al. (2025). Development of Notional Permit Vehicles for Complex Bridge Ratings in Alabama.
Roszczenko, Rafal and Luszczynska, Aneta K. and Nowak, Andrzej S. "Development of Notional Permit Vehicles for Complex Bridge Ratings in Alabama" (2025)
Roszczenko, Rafal et al. "Development of Notional Permit Vehicles for Complex Bridge Ratings in Alabama" , 2025
This research investigated the viability of novel glass-fiber reinforced thermoplastic (TP) composite rebars, manufactured using a continuous forming process, as a potential field-bendable and corrosion-proof alternative to conventional steel and commercial glass-fiber reinforced thermoset (TS) rebars. The study focused on TP composites using polyb
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Thapa, Rohan et al. (2025). Thermoplastic Composite Rebar Durability and Mechanical Testing.
Thapa, Rohan et al. "Thermoplastic Composite Rebar Durability and Mechanical Testing" (2025)
Thapa, Rohan et al. "Thermoplastic Composite Rebar Durability and Mechanical Testing" , 2025
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
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Sakhare, Rahul Suryakant et al. (2025). Connected Vehicle Trajectory Data to Screen Network for Hard-Braking and Hard-Acceleration Events. https://doi.org/10.5703/1288284318579
Sakhare, Rahul Suryakant et al. "Connected Vehicle Trajectory Data to Screen Network for Hard-Braking and Hard-Acceleration Events" (2025), https://doi.org/10.5703/1288284318579
Sakhare, Rahul Suryakant et al. "Connected Vehicle Trajectory Data to Screen Network for Hard-Braking and Hard-Acceleration Events" , 2025, https://doi.org/10.5703/1288284318579
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
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Overall, Myles W. et al. (2025). Case Studies Documenting Lessons Learned and Identifying Opportunities for Maintenance of Traffic (MOT) Improvements. https://doi.org/10.5703/1288284318578
Overall, Myles W. et al. "Case Studies Documenting Lessons Learned and Identifying Opportunities for Maintenance of Traffic (MOT) Improvements" (2025), https://doi.org/10.5703/1288284318578
Overall, Myles W. et al. "Case Studies Documenting Lessons Learned and Identifying Opportunities for Maintenance of Traffic (MOT) Improvements" , 2025, https://doi.org/10.5703/1288284318578
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
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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
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Sung, Jookyeung et al. (2025). Systematic Study of Type 1L Cement for Mixture Optimization and Carbon Reduction. https://doi.org/10.5703/1288284318575
Sung, Jookyeung et al. "Systematic Study of Type 1L Cement for Mixture Optimization and Carbon Reduction" (2025), https://doi.org/10.5703/1288284318575
Sung, Jookyeung et al. "Systematic Study of Type 1L Cement for Mixture Optimization and Carbon Reduction" , 2025, https://doi.org/10.5703/1288284318575
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
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Wang, Xun et al. (2025). Refined Bridge Deck Design and Analysis.
Wang, Xun et al. "Refined Bridge Deck Design and Analysis" (2025)
Wang, Xun et al. "Refined Bridge Deck Design and Analysis" , 2025
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
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Dobson, Richard J. et al. (2025). Identify Mapping Techniques of Invasive Plant Species Within the MDOT Right-of-Way.
Dobson, Richard J. et al. "Identify Mapping Techniques of Invasive Plant Species Within the MDOT Right-of-Way" (2025)
Dobson, Richard J. et al. "Identify Mapping Techniques of Invasive Plant Species Within the MDOT Right-of-Way" , 2025
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
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Alani, Adam et al. (2025). Mitigating Concentrated Sheet Flow of Water at Ends of Superelevated Curves [Technical Summary].
Alani, Adam and Roundy, Joshua and Kondyli, Alexandra "Mitigating Concentrated Sheet Flow of Water at Ends of Superelevated Curves [Technical Summary]" (2025)
Alani, Adam et al. "Mitigating Concentrated Sheet Flow of Water at Ends of Superelevated Curves [Technical Summary]" , 2025
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
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Liu, Jun et al. (2025). Safety Effectiveness of Inside Shoulder Widths on Freeways in Georgia.
Liu, Jun et al. "Safety Effectiveness of Inside Shoulder Widths on Freeways in Georgia" (2025)
Liu, Jun et al. "Safety Effectiveness of Inside Shoulder Widths on Freeways in Georgia" , 2025
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
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Hossain, M. Shabbir et al. (2025). A Follow-Up Evaluation of the Concrete Pavements (U.S. 58) Rehabilitated in 2012.
Hossain, M. Shabbir and Ozyildirim, Celik and Nair, Harikrishnan "A Follow-Up Evaluation of the Concrete Pavements (U.S. 58) Rehabilitated in 2012" (2025)
Hossain, M. Shabbir et al. "A Follow-Up Evaluation of the Concrete Pavements (U.S. 58) Rehabilitated in 2012" , 2025
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