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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 541 - 560 of 36841 results
  • Traffic DisruptionFree Bridge Inspection Initiative with Robotic Systems Research Summary
    Traffic Disruption-Free Bridge Inspection Initiative with Robotic Systems [Research Summary]
    Chen, Genda ;
    Harper, Jennifer
    2025-09-01 | PDF
    The research team evaluated 59 bridges in diverse types, age groups, and geographical locations. Best practices of the technologies were developed and summarized in inspection protocols and guidelines using commercial drones, structural crawlers, and hybrid uncrewed vehicles. Bridge inspection protocols and guidelines are presented in three parts: ...
  • New Jersey DOT 2025 Research Peer Exchange
    New Jersey DOT 2025 Research Peer Exchange
    Johnson, Susan ;
    Seeber, Kirsten
    2025-09-01 | PDF
    New Jersey Department of Transportation, in collaboration with the Northeast Transportation Research Consortium (NTRC), hosted a peer exchange on June 24, 25, and 26, 2025, in Princeton, New Jersey. The publication of this report fulfills the agencies' obligations to conduct a periodic peer exchange as part of the federal State Planning & Research ...
  • Nebraska DOT Texas DOT and Wyoming DOT 2025 Research Peer Exchange
    Nebraska DOT, Texas DOT, and Wyoming DOT 2025 Research Peer Exchange
    Seeber, Kirsten ;
    Hirt, Brian
    2025-09-01 | PDF
    Nebraska Department of Transportation, Texas Department of Transportation and Wyoming Department of Transportation, in collaboration with the Western Transportation Research Consortium (WTRC), hosted a peer exchange on May 20-22, 2025, in Austin, Texas. The publication of this report fulfills the agencies' obligations to conduct a periodic peer exc ...
  • EndtoEnd Learning Framework for Transportation Network Equilibrium Modeling
    End-to-End Learning Framework for Transportation Network Equilibrium Modeling
    Liu, Zhichen ;
    Yin, Yafeng
    2025-09-01 | PDF
    This project introduces an end-to-end framework for constructing integrated traffic network equilibrium models, which can serve as lightweight travel demand models, directly from multi-day aggregate traffic state observations. Unknown components on both the supply and demand sides are parameterized with computational graphs and embedded in a variat ...
  • Nighttime Pedestrian Safety in Different Communities Application of Artificial Intelligence Techniques
    Nighttime Pedestrian Safety in Different Communities: Application of Artificial Intelligence Techniques
    Usman, Sheikh M. ;
    Khattak, Asad J.
    2025-09-01 | PDF
    Pedestrian safety is a growing concern in the United States transportation sector, with around 7500 pedestrian crash fatalities reported in the US in 2021. Pedestrians are at an even higher risk of crashes at night due to limited visibility and alcohol impairment of the drivers or pedestrians. The United States Department of Transportation (USDOT) ...
  • Beyond the Conventional Exploring Pedestrian Safety on Interstates with Bayesian and Machine Learning Models
    Beyond the Conventional: Exploring Pedestrian Safety on Interstates with Bayesian and Machine Learning Models
    Usman, Sheikh M. ;
    Khattak, Asad J.
    2025-09-01 | PDF
    Despite being prohibited from walking on freeways per federal laws, 14% to 17% of all pedestrian crashes in the United States happen on the interstates. Examining these crashes within the context of the safe systems approach is essential, with an emphasis on mitigating safety risks for all road users. This study investigates the correlates of pedes ...
  • Effects of Extreme Climate Shifts to Pavement Infrastructure in Tennessee
    Effects of Extreme Climate Shifts to Pavement Infrastructure in Tennessee
    Onyango, Mbakisya ;
    Fomunung, Ignatius
    2025-09-01 | PDF
    Resilient pavement infrastructure is a dream of every transportation agency. Many factors affect the health of pavement infrastructure to include extreme climate shifts. This study evaluated the effects of climate shifts to pavement infrastructure in Tennessee. The study used AASHTOWare PMED software to predict distresses on selected pavement secti ...
  • Automating Variable Speed Limits Using Weather Traffic and Friction Data
    Automating Variable Speed Limits Using Weather, Traffic and Friction Data
    Petzke, Bill ;
    Wang, Hao
    2025-09-01 | PDF
    Variable speed limits (VSL) are useful in promoting highway safety. According to the Federal Highway Administration (FHWA), "the use of VSLs during inclement weather or other less than ideal conditions can improve safety by decreasing the risks associated with traveling at speeds that are higher than appropriate for the conditions." The project's r ...
  • An Intelligent HumanCentric Communication System for Adverse Weather and Road Conditions
    An Intelligent Human-Centric Communication System for Adverse Weather and Road Conditions
    Demir, Ibrahim ;
    Sermet, Yusuf
    2025-09-01 | PDF
    Adverse weather conditions present significant risks to motorists, making safe navigation challenging. Artificial intelligence (AI) advancements have facilitated the development of intelligent systems to address these concerns. This project introduces Conversational AI for Road Weather Information Systems (CARWIS), an AI-powered solution that provi ...
  • Whos to Blame for EScooter Collisions An Analysis of the Language Used in EScooter Collision Reporting
    Who’s to Blame for E-Scooter Collisions?: An Analysis of the Language Used in E-Scooter Collision Reporting
    Johnson, Milena
    ORCID ICON IMG
    2025-08-31 | PDF
    The growing popularity of electric scooters (e-scooters) in urban environments has led to increased media coverage on their perceived danger both to the rider and to other users of the roadway. Media surrounding traffic collisions has long been criticized by safety researchers and activists for implicitly assigning blame to more vulnerable road use ...
  • Select High Risk Pedestrian Midblock Crossings and Perform Safety Evaluations for Developing Pedestrian Crossings Project Summary
    Select High Risk Pedestrian Midblock Crossings and Perform Safety Evaluations for Developing Pedestrian Crossings [Project Summary]
    Sharif, Hatim O. ;
    Dessouky, Samer
    2025-08-31 | PDF
    The researchers conducted a comprehensive literature review to evaluate the current state of practice surrounding crash rates and severity at midblock crossings. They examined technical reports and publications from transportation agencies, FHWA, NCHRP, and peer-reviewed journals. Findings were synthesized into a detailed summary of risk factors, p ...
  • Develop Guidance for Sustainable Traffic Signal Operation Strategies to Support All Intersection Users Project Summary Report
    Develop Guidance for Sustainable Traffic Signal Operation Strategies to Support All Intersection Users [Project Summary Report]
    Machemehl, Randy ;
    Reynolds, Isabelle
    2025-08-31 | PDF
    The research team conducted a thorough review of the state of the art and state of the practice of complete street pedestrian and bicycle safety countermeasures. They developed a thorough review of techniques used to compute crash modification factors for safety countermeasures, including signal operations strategies. They produced a discussion of ...
  • Develop an Interactive Unit Price Estimation and Visualization Tool Project Summary Report
    Develop an Interactive Unit Price Estimation and Visualization Tool [Project Summary Report]
    Shahandashti, Mohsen ;
    Yasar, Mahmut
    2025-08-31 | PDF
    The primary objectives of this research project were to (1) conduct an overview analysis of factors affecting unit prices, (2) identify factors affecting unit prices in Texas, (3) create a unit price estimation database, (4) create a spatio-temporal unit price estimation model considering the factors affecting unit prices, (5) develop a GIS-based v ...
  • Connecting the First and Last Mile A Systematic Review of Student Use of EScooters for FirstLastMile Connections to Public Transit
    Connecting the First and Last Mile: A Systematic Review of Student Use of E-Scooters for First/Last-Mile Connections to Public Transit
    Wilcox, Micah
    ORCID ICON IMG
    2025-08-31 | PDF
    Students on university campuses have several available options for travel, including cars, buses, and micromobility, the latter of which encompasses bicycles and more recently, shared e-scooters (e-scooters). E-scooters are lightweight, electric vehicles which can be rented or purchased easily. They offer an ideal option to close the first/last-mil ...
  • Improving Testing Requirements in Item 300 of TxDOT Standard Specifications Project Summary
    Improving Testing Requirements in Item 300 of TxDOT Standard Specifications [Project Summary]
    Bhasin, Amit ;
    Goehl, Darlene
    2025-08-31 | PDF
    The goal of this project was to identify and update the tests and specifications in Item 300 as needed to ensure that the test methods and specifications are relevant, not redundant, and up-to-date. A review of most materials in Item 300 was in the scope of this project; however, crack sealers, asphalt-rubber binders, and recycling agents were not ...
  • Synthesis Carbon Capture and Repurposing ByProducts Project Summary Report
    Synthesis: Carbon Capture and Repurposing By-Products [Project Summary Report]
    Rausch, Christopher ;
    Ferron, Raissa
    2025-08-31 | PDF
    The research team undertook a comprehensive, multi-method assessment of CCUS for transportation infrastructure applications. The researchers began with a technical review of CCUS methods used across industries, ranging from direct approaches such as pre-combustion, post-combustion, and direct air capture to indirect methods such as mineralization, ...
  • 07037 Develop Models for Freight Flows and Commercial Travel Patterns within Texas Urban Regions Brief
    0-7037: Develop Models for Freight Flows and Commercial Travel Patterns within Texas Urban Regions [Brief]
    Morgan, Curtis ;
    Sivaraman, Vijayaraghavan
    2025-08-31 | PDF
    This project was initiated in order to develop a model/tool that could help the Texas Department of Transportation (TxDOT) and other transportation planners estimate and assess changes in freight traffic flow impacts on the Texas Highway Freight Network (THFN) much more quickly than conducting a Statewide Analysis Model run. The goal was to produce ...
  • Synthesis Develop Design Guidelines for Applications of Light Weight Aggregate in Embankments and Mechanically Stabilized Earth MSE Walls Evaluate Cost Benefit Performance Project Summary Report
    Synthesis: Develop Design Guidelines for Applications of Light Weight Aggregate in Embankments and Mechanically Stabilized Earth (MSE) Walls – Evaluate Cost Benefit & Performance [Project Summary Report]
    Zornberg, Jorge G. ;
    Morsy, Amr M
    2025-08-31 | PDF
    The research team conducted a thorough synthesis of the state of the practice of using lightweight fills in transportation infrastructure. This synthesis was accomplished through a review of the published literature, a survey of state DOT practices, an evaluation of case studies involving the use of various lightweight fills inside and outside Texa ...
  • 07148 Develop Design Details for CRCP Whitetopping and Unbonded Overlays Summary
    0-7148: Develop Design Details for CRCP Whitetopping and Unbonded Overlays [Summary]
    Won, Moon ;
    Goehl, Darlene C
    2025-08-31 | PDF
    Existing design methodologies for concrete overlays often rely on outdated empirical approaches or complex mechanistic models that lack adequate field validation. This has resulted in a significant gap in practice, particularly the design of Continuously Reinforced Concrete Pavement (CRCP) overlays, for which no standardized procedure exists in man ...
  • Systematic and Quantitative Approaches to Assess the Probability of Extreme Weather and Resilience Risks for TxDOT Highways and Bridges Project Summary Report
    Systematic and Quantitative Approaches to Assess the Probability of Extreme Weather and Resilience Risks for TxDOT Highways and Bridges [Project Summary Report]
    Birt, Andrew ;
    Prozzi, Jorge
    2025-08-31 | PDF
    The research team undertook a multi-phase study to build a flood-based risk and resilience assessment framework: • Reviewed peer state TAMPs and literature to identify current practices, gaps, and opportunities for integrating resilience. • Selected flooding as the primary disturbance agent for analysis, given its significance in Texas and the avai ...
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