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US Transportation Collection

rosaP Repository & Open Science Access Portal

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 141 - 160 of 35753 results
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Effect of Asphalt Binder Source on Asphalt Mixture Performance
    Effect of Asphalt Binder Source on Asphalt Mixture Performance
    Mogawer, Walaa S. ;
    Rowe, Geoffrey
    2025-09-01 | PDF
    This study aims to identify point and shape rheological parameters that can effectively differentiate between high and low-quality asphalt binders, particularly in their resistance to intermediate-temperature cracking, regardless of binder source or formulation changes. Point parameters assess binder hardness, while shape parameters describe the bi ...
  • Research Summary Evaluating Taconite as a Lower Cost Friction Treatment Research Summary
    Research Summary: Evaluating Taconite as a Lower Cost Friction Treatment [Research Summary]
    Zanko, Lawrence M. ;
    Lund, Victor
    2025-09-01 | PDF
    Minnesota’s taconite (iron ore) mining industry can provide adequate or comparable skid resistance performance to calcined bauxite in high friction surface treatment (HFST)-type applications. Six pavement test sections approximately 1/10th of a mile (160 meters) in length were established at a low volume road location northwest of Duluth, Minnesota ...
  • Evaluating Road Designs That Use Lower Quality Aggregate Research Summary
    Evaluating Road Designs That Use Lower Quality Aggregate [Research Summary]
    Tutumluer, Erol ;
    Velasquez, Raul
    2025-09-01 | PDF
    Aggregate materials used in the base and subbase layers of pavements provide structural support and drainability to Minnesota roads. But the supply of locally available high-quality aggregate material is becoming increasingly scarce. This project explored sustainable and cost-effective solutions for constructing durable flexible pavement roads with ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Proceedings of the 33rd United States Japan Bridge Engineering Workshop
    Proceedings of the 33rd United States - Japan Bridge Engineering Workshop
    Yang, David Y.
    ORCID ICON IMG
    2025-09-01 | PDF
    This report summarizes the 33rd United States–Japan Bridge Engineering Workshop, an event that convenes bridge engineers from both countries. The workshop serves as a platform to exchange innovative ideas and technologies, as well as to share crucial knowledge and lessons learned, all with the aim of advancing bridge engineering. The 33rd workshop ...
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