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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 35438 results
  • 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 ...
  • Towards a Centralized BIM Transportation Library
    Towards a Centralized BIM Transportation Library
    Costin, Aaron ;
    Ketterl, Mona
    2025-09-01 | PDF
    This report provides a comprehensive assessment and availability of the technical resources required in the development of a Central Building Information Modeling (BIM) Transportation Library (CBTL), outlining its foundational requirements based on past research, related projects, and stakeholder engagement. The CBTL is envisioned as a nationally a ...
  • RepairPreservation of Concrete Compression Members in Bridges Using UltraHighPerformance Concrete UHPC
    Repair/Preservation of Concrete Compression Members in Bridges Using Ultra-High-Performance Concrete (UHPC)
    Hedia, Mohammed ;
    Morcous, George
    2025-09-01 | PDF
    As of 2024, approximately 36% of bridges across the United States require repair or replacement, with 7% classified as structurally deficient. The estimated cost to address these deficiencies exceeds $260 billion. In recent years, Ultra-High-Performance Concrete (UHPC) has emerged as a repair material for infrastructure preservation, drawing increa ...
  • LongTerm Corrosion Monitoring in Mechanically Stabilized Earth MSE Walls
    Long-Term Corrosion Monitoring in Mechanically Stabilized Earth (MSE) Walls
    Kulesza, Stacey ;
    Parsons, Robert
    2025-09-01 | PDF
    This research is a continuation of K-TRAN: KSU-19-5. Mechanically stabilized earth (MSE) walls with metallic reinforcement are widely used as a cost-effective means of earth retention. Metallic reinforcement, which is susceptible to corrosion, is typically sized for a 75-year design life after allowing for a standard rate of corrosion. The Kansas D ...
  • Historical Streamflow Discharge Trends Considering Climate Change and Application
    Historical Streamflow Discharge Trends Considering Climate Change and Application
    Rossetti, Maria S.
    2025-09-01 | PDF
    Bridges and large culverts are designed using historical streamflow data. However, historical streamflow data are static and do not account for changes in precipitation, temperature, and watershed characteristics such as the percentage covered by impervious surface. This report details efforts to determine if streamflow peak discharges in Virginia ...
  • Use of Innovative Recycling Agents for Improving the Sustainability and Durability of Asphalt Pavement Summary
    Use of Innovative Recycling Agents for Improving the Sustainability and Durability of Asphalt Pavement [Summary]
    Mohammad, Louay N. ;
    Elnaml, Ibrahim
    2025-09-01 | PDF
    The use of reclaimed asphalt pavement (RAP) as a partial replacement for virgin aggregates and asphalt binders has received considerable attention in recent years due to its economic and environmental benefits. These benefits include a potential reduction in asphalt mixture cost and the promotion of sustainability. However, many state Departments o ...
  • 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 ...
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