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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 61 - 80 of 35412 results
  • Exploring the Impact of Driver Sex Driver Age Area Type and Lighting Conditions on RearEnd Collision Severity
    Exploring the Impact of Driver Sex, Driver Age, Area Type, and Lighting Conditions on Rear-End Collision Severity
    Naseralavi, Saber ;
    Soltanirad, Mohammad
    2025-09-01 | PDF
    This study investigates the factors influencing injury severity in rear-end collisions in California using data from the Highway Safety Information System (HSIS). A total of 569,386 rear-end crashes recorded between 2015 and 2017 are analyzed. The dataset is divided into 24 subgroups based on driver sex (male, female), driver age (under 25, 25–65, ...
  • Phase III Investigation and Guidelines for Best Practices of Thermal Control for Mass Concrete Construction Projects
    Phase III: Investigation and Guidelines for Best Practices of Thermal Control for Mass Concrete Construction Projects
    Cho, Yong Kwon ;
    Gentry, Russell
    2025-09-01 | PDF
    The objective of this research is to expand and validate decision-making tools and best practices for mass concrete thermal management, integrating emerging cementitious materials. Building on the foundations established in previous phases, this project evaluates an expanded range of concrete mix designs—including Type IL cement and reclaimed fly a ...
  • LongTerm Corrosion Monitoring in Mechanically Stabilized Earth MSE Walls Summary
    Long-Term Corrosion Monitoring in Mechanically Stabilized Earth (MSE) Walls [Summary]
    Kulesza, Stacey ;
    Parsons, Robert
    2025-09-01 | PDF
    Mechanically stabilized earth (MSE) walls often contain galvanized steel reinforcement. Because galvanized steel eventually corrodes, however, the corrosion process must be closely monitored to accurately determine where structures are in their life cycle and to improve specifications to lengthen the lifespan of future MSE walls. This report is a c ...
  • Development of a Geotechnical Asset Management System
    Development of a Geotechnical Asset Management System
    Parsons, Robert L. ;
    Kulesza, Stacey
    2025-09-01 | PDF
    Geotechnical asset management (GAM) systems are a critical element of Transportation Asset Management (TAM) plans. Geotechnical assets include walls, slopes, embankments, and subgrades within the right of way. Although the Kansas Department of Transportation (KDOT) has a TAM, it does not currently have a GAM. A fully developed GAM would allow retri ...
  • Development of a Geotechnical Asset Management System Summary
    Development of a Geotechnical Asset Management System [Summary]
    Parsons, Robert L. ;
    Kulesza, Stacey
    2025-09-01 | PDF
    Geotechnical asset management (GAM) systems are a critical element of Transportation Asset Management (TAM) plans. Geotechnical assets include walls, slopes, embankments, and subgrades within the right of way. Although the Kansas Department of Transportation (KDOT) has a TAM, it does not currently have a GAM. A fully developed GAM would allow retri ...
  • Night Versus Day WorkBalancing Safety Operations and Constructability for ShortTerm Operations on TwoLane Roads
    Night Versus Day Work—Balancing Safety, Operations, and Constructability for Short-Term Operations on Two-Lane Roads
    Robartes, Erin M
    2025-09-01 | PDF
    Allowable work hours (AWH), also known as Allowable Closure Hours or Limitations on Operations, for a contract dictate which hours of the day construction and maintenance activities may occur and are known to affect operations, constructability, and safety. Individual districts set AWH for activities—including short-term maintenance, paving project ...
  • Effects of Trucking Regulatory Relaxations on Freight Safety in Oregon
    Effects of Trucking Regulatory Relaxations on Freight Safety in Oregon
    Anderson, Jason C. ;
    McKenzie, William
    2025-09-01 | PDF
    This study explores the effects of pandemic-related trucking relaxations on freight safety in Oregon. A historical review of trucking relaxations before and during the pandemic is conducted and compared. Using traffic volume levels and key pandemic dates, three time periods were chosen for analysis: (1) pre-pandemic, (2) a low VMT pandemic period w ...
  • Sources and Substitutes for Fly Ash in Concrete
    Sources and Substitutes for Fly Ash in Concrete
    Mobasher, Barzin ;
    Neithalath, Narayanan
    2025-09-01 | PDF
    Fly ash, a by-product of coal combustion, improves the workability, mechanical properties, durability, and sustainability of concretes when added as a supplement. Dwindling supplies of fly ash led Arizona DOT (ADOT) to investigate the use of alternative cementitious materials (ACMs) in concrete mixture designs. This study drew from a review of lite ...
  • Traffic DisruptionFree Bridge Inspection Initiative with Robotic Systems
    Traffic Disruption-Free Bridge Inspection Initiative with Robotic Systems
    Chen, Genda ;
    Shi, Zhenhua
    2025-09-01 | PDF
    The current practice of bridge inspection requires the use of snooper trucks and, when parked on bridges, the control of passing traffic, thus causing an operation safety concern for both passengers and inspectors. It also leads to inherently subjective and qualitative results. This pooled-fund study aims to develop case studies on the deployment a ...
  • 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: ...
  • AIEnabled Vision System for Intersection Analytics Research Summary
    AI-Enabled Vision System for Intersection Analytics [Research Summary]
    Adu-Gyamfi, Yaw ;
    Schulte, Brent
    2025-09-01 | PDF
    This project is designed to overcome the challenges faced by today’s traffic management systems by: 1. Developing a fully automated vision system architecture to generate Turning Movement Counts (TMCs) eliminating the need for manual directional inputs. 2. Integrating TMCs with SPaT data to generate key intersection performance metrics including de ...
  • Assessment and Repair of Prestressed Bridge Girders Subjected to OverHeight Truck Impacts
    Assessment and Repair of Prestressed Bridge Girders Subjected to Over-Height Truck Impacts
    AbdelMalek, Haitham ;
    Ashun, Francis
    2025-09-01 | PDF
    This research investigates the impact of over-height vehicle collisions on prestressed concrete bridge girders and explores effective repair strategies to restore their structural integrity. The study addresses a critical concern in bridge resilience, as vehicle impacts can cause varying degrees of damage and severe prestressing strands which compr ...
  • Effective Coordination with Towing Companies for Incident Response and Clearance
    Effective Coordination with Towing Companies for Incident Response and Clearance
    Brown, Henry ;
    Sun, Carlos
    2025-09-01 | PDF
    Tow truck operators are directly exposed to traffic when responding to incidents. In addition, stalled vehicles on the highway can hinder safety and operations on the highway and can create a risk of secondary incidents. Fast and effective removal of stalled vehicles on the highway can improve traffic operations and safety for tow truck operators a ...
  • AIEnabled Vision System for Intersection Analytics
    AI-Enabled Vision System for Intersection Analytics
    Adu-Gyamfi, Yaw ;
    Tanner, Muturi
    2025-09-01 | PDF
    This project developed and demonstrated an AI-enabled vision system for intersection analytics capable of automatically generating Turning Movement Counts (TMCs) and integrating them with Signal Phase and Timing (SPaT) data to evaluate traffic signal performance. Using existing Missouri Department of Transportation (MoDOT) CCTV (Closed Circuit Tele ...
  • Effective Coordination with Towing Companies for Incident Response and Clearance Tech Brief
    Effective Coordination with Towing Companies for Incident Response and Clearance [Tech Brief]
    Brown, Henry ;
    Sun, Carlos
    2025-09-01 | PDF
    Tow truck operators are exposed to traffic when responding to incidents. Stalled vehicles on the highway can hinder safety and operations on the highway and can create a risk of secondary incidents. Fast and effective removal of stalled vehicles on the highway can improve traffic operations and safety for tow truck operators and all users of the tr ...
  • Effective Coordination with Towing Companies for Incident Response and Clearance Summary
    Effective Coordination with Towing Companies for Incident Response and Clearance [Summary]
    Brown, Henry ;
    Breeding, Scott
    2025-09-01 | PDF
    Tow truck operators are directly exposed to traffic when responding to incidents. Stalled vehicles can also hinder safety and operations on the highway and can create risk of secondary incidents. The objectives of this research study are to synthesize existing department of transportation (DOT) practices regarding coordination with towing companies ...
  • Assessment and Repair of Prestressed Bridge Girders Subjected to OverHeight Truck Impacts Research Summary
    Assessment and Repair of Prestressed Bridge Girders Subjected to Over-Height Truck Impacts [Research Summary]
    ElGawady, Mohamed ;
    Harper, Jennifer
    2025-09-01 | PDF
    This comprehensive research project addresses the increasingly frequent and costly problem of over-height vehicle collisions with prestressed concrete (PC) bridge girders. The research combined full-scale experimental testing, nonlinear three-dimensional finite element modeling (FEM), and analytical methods to quantify the extent of damage, assess ...
  • Evaluation of Unbonded Jointed Concrete Overlays
    Evaluation of Unbonded Jointed Concrete Overlays
    Pérez, Jesús Castro ;
    Bhardwaj, Richa
    2025-09-01 | PDF
    Concrete overlays for existing concrete and asphalt roads have been shown to be a viable rehabilitation or replacement option. This research project evaluated three unbonded concrete overlay (UBOL) projects in Illinois with high, medium, and very low truck volumes. The project’s goal was to assess each overlay’s performance including the influence ...
  • 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 ...
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