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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 201 - 220 of 36022 results
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Balanced Mix Design Field Trial Projects in Alabama
    Balanced Mix Design Field Trial Projects in Alabama
    Sadeghi, Mohammad ;
    Hartzog, Zane
    2025-09-01 | PDF
    The Alabama Department of Transportation (ALDOT) is advancing Balanced Mix Design (BMD) to improve the durability, reliability, and cost-effectiveness of asphalt pavements. To support implementation, a field validation project was conducted on State Route 55 in Covington County, Alabama, using six asphalt mixtures designed to meet target thresholds ...
  • 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 ...
  • 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 ...
  • 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, ...
  • 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 Combining Heat Induction and Laser Ablation for the Removal of Potentially Hazardous Bridge Coatings
    Evaluation of Combining Heat Induction and Laser Ablation for the Removal of Potentially Hazardous Bridge Coatings
    Sharp, Stephen R ;
    Provines, Jason T.
    2025-09-01 | PDF
    This project aimed to evaluate whether combining induction coating removal (ICR) and laser ablation coating removal (LACR) could be combined to remove hazardous bridge coatings at practical rates. This study included evaluations of the coating removal rates, surface cleanliness, surface profile, steel substrate mechanical properties, recoating adhe ...
  • Identifying Safety Hot Spots in Close Proximity to K12 Schools
    Identifying Safety Hot Spots in Close Proximity to K-12 Schools
    Burbidge, Shaunna K. ;
    Runyan, Samuel L
    2025-09-01 | PDF
    This study was conducted to help the Utah Department of Transportation (UDOT) identify and prioritize schools which have seen higher numbers of pedestrian- or bicyclist-involved crashes of school-age individuals. While UDOT’s Safe Routes to School (SRTS) Program (which is called Safe Routes Utah within the state) supports safety planning and infras ...
  • 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 ...
  • Assessment of UltraHigh Toughness Steel for Highway Bridges
    Assessment of Ultra-High Toughness Steel for Highway Bridges
    Collins, William ;
    Artmont, Frank A.
    2025-09-01 | PDF
    The objective of this study was to investigate the effectiveness of using ultra-high toughness (UHT) steel in bridges to improve the structural reliability for the fracture limit state. The work included literature review, identification of candidate UHT steels, initial material characterization of all candidate steels, in-depth material characteri ...
  • Urban Growth Congestion and Equity Leveraging MultiMobility and Active Infrastructure Investments for Livable Cities A Dissertation
    Urban Growth, Congestion, and Equity: Leveraging Multi-Mobility and Active Infrastructure Investments for Livable Cities: A Dissertation
    Raymer, Meredith
    ORCID ICON IMG
    2025-09-01 | PDF
    Cities are dynamics centers of modern life, continually evolving through both growth and decline. While agglomeration and associated amenities are benefits of growing global urbanization, congestion and the resulting pollution, delays, and inequity are common negative externalities of increasing urbanization. This study evaluates growth and congest ...
  • Development of a Simplified Methodology to Assess the Internal Redundancy of BoltedBuiltUp Tied Arch Members
    Development of a Simplified Methodology to Assess the Internal Redundancy of Bolted-Built-Up Tied Arch Members
    Farooq, Shah Zaib ;
    Korkmaz, Cem
    2025-09-01 | PDF
    Tied arch bridges represent a vital component of the nation's infrastructure, valued for their structural efficiency and aesthetic qualities. These bridges rely on arch ribs to transfer vertical loads into horizontal thrusts, which are counteracted by the tie beams (TBs) acting in axial tension. In addition to this axial tension, TBs are also subje ...
  • 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 ...
  • 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 ...
  • 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: ...
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