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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 5921 - 5940 of 36958 results
  • Degradation Mechanisms and Service Life Estimation of Fiber Reinforced Polymer FRP Concrete Summary
    Degradation Mechanisms and Service Life Estimation of Fiber Reinforced Polymer (FRP) Concrete [Summary]
    Elsafty, Adel
    2019-08-01 | PDF
    University of North Florida researchers investigated the physical and mechanical properties, durability, and resistance to alkali of GFRP reinforcing bars and CFRP prestressing strands. They studied the structural behavior of concrete beams prestressed with CFRP beams.
  • Numerical Simulation of Snow Deposition Around Living Snow Fences
    Numerical Simulation of Snow Deposition Around Living Snow Fences
    Petrie, John ;
    Zhang, Kun
    2019-08-01 | PDF
    In this study, computational fluid dynamics (CFD) was used to investigate the air flow around porous snow fences to gain insight into snow transport and deposition in the vicinity of fences. Numerical simulations were performed to validate the CFD approach using experimental data from a wind tunnel study. Subsequent simulations were used to test th ...
  • Highway Construction Work Zone Safety Performance and Improvement in Louisiana
    Highway Construction Work Zone Safety Performance and Improvement in Louisiana
    Schneider, Helmut ;
    Hutchinson, Cory
    2019-08-01 | PDF
    This project provides a review of current work zone crash reporting practices in the US in general and specifically in Louisiana. While national guidelines such as the MMUCC standardize definitions and data elements, the degree to which states have adopted the MMUCC guidelines/data elements regarding work zone crashes varies considerably across sta ...
  • Development of Tendon Imaging Sensor
    Development of Tendon Imaging Sensor
    Freij, Hani ;
    Dukeman, David
    2019-08-01 | PDF
    Inadequate grouting is associated with corrosion of post-tensioning steel in grouted tendons used in construction applications. This project was conducted to develop a nondestructive method capable of economical, rapid imaging assessment of grout deficiencies of external tendons in the FDOT structural inventory. The method uses electrical impedance ...
  • Accelerated Load Testing of Geosynthetic Base ReinforcedStabilized Unpaved and Pavement Test Sections Tech Summary
    Accelerated Load Testing of Geosynthetic Base Reinforced/Stabilized Unpaved and Pavement Test Sections [Tech Summary]
    Abu-Farsakh, Murad Y. ;
    Zhang, Zhongjie
    2019-08-01 | PDF
    Roads in Louisiana are often built over weak subgrade soils due to the soft nature of subsurface soils and the presence of high water tables, which create many design and construction challenges. A common practice in Louisiana is to stabilize/treat the upper part of subgrade with cement or lime, depending on the subgrade soil type. This practice ca ...
  • Effects of Blast Furnace Slag Characteristics on Durability of Cementitious Systems for Florida Concrete Structures
    Effects of Blast Furnace Slag Characteristics on Durability of Cementitious Systems for Florida Concrete Structures
    Zayed, Abla ;
    Riding, Kyle A
    2019-08-01 | PDF
    Four ordinary portland cements (OPC) and 8 ground-granulated blast furnace slags (GGBFS) were tested to assess the cracking potential and sulfate durability of slag-blended cementitious systems. The as-received materials were tested for their physical, chemical and mineralogical composition using Blaine fineness, particle size distribution, specifi ...
  • A New Sustainable Additive for Selfdeicing Asphalt
    A New Sustainable Additive for Self-deicing Asphalt
    Zhang, Yan ;
    Shi, Xianming
    2019-08-01 | PDF
    Based on a review and synthesis of the state-of-the-art literature on asphalt pavement with anti-icing additives, this laboratory study developed an anti-icing asphalt pavement that incorporates innovative salt-storage additives with a sustained salt-release rate. These additives were prepared through a surface treatment approach, in which zeolite ...
  • Evaluation of Managed Lane Facilities in a Connected Vehicle Environment
    Evaluation of Managed Lane Facilities in a Connected Vehicle Environment
    Abdel-Aty, Mohamed ;
    Wu, Yina
    2019-08-01 | PDF
    On freeways, managed lanes (MLs) have emerged as an effective dynamic traffic management strategy. They are vital for managing time and congestion through tolling while also providing drivers with more choices. They play an important role in improving traffic mobility, efficiency, and safety, in addition to generating revenue for transportation age ...
  • Impact Assessments of Automated Truck Platooning on Highway Traffic Flow and Adjacent Drivers
    Impact Assessments of Automated Truck Platooning on Highway Traffic Flow and Adjacent Drivers
    Spasovic, Lazar N. ;
    Bensenski, Dejan
    2019-08-01 | PDF
    Automated Truck Platooning (ATP) enables a group of commercial trucks to move safely together with higher speeds and shorter headways between them. By assisting truck drivers and reducing human error, ATPs are expected to improve traffic safety. Since 2013, the performance of ATPs has been investigated through several research efforts that included ...
  • MultiScale Models for Transportation Systems under Emergency
    Multi-Scale Models for Transportation Systems under Emergency
    Liu, Dahai ;
    Namilae, Sirish
    2019-08-01 | PDF
    The purpose of this study is to investigate human behavior in emergencies. More specifically, agent-based simulation and social force models were developed to examine the impact of various human and environmental factors on the efficiency of the evacuation process, through a series of case studies. The independent variables of the case studies incl ...
  • Before and AfterImplementation Studies of Advanced Signal Control Technologies in Florida
    Before and After-Implementation Studies of Advanced Signal Control Technologies in Florida
    Elefteriadou, Lily ;
    Manjunatha, Pruthvi
    2019-08-01 | PDF
    The Florida Department of Transportation (FDOT) has proposed the implementation of Adaptive Signal Control Technologies (ASCT) on eight corridors in Florida to overcome the limitations of traditional signal systems in cases of changes in traffic demand, weather, incidents, etc. The main objectives of this project are to evaluate the implementation ...
  • Interdependency of Port Clusters during Regional Disasters
    Interdependency of Port Clusters during Regional Disasters
    Parr, Scott A. ;
    Wolshon, Brian
    2019-08-01 | PDF
    Ports play a vital role in the economy of nations and provide a critical link in the supply chain. Ports form the gateway by which essential goods are received within large geographic regions. Because of their function, ports are exposed to substantial risk of flooding, storm events, sea-level-rise, and climate change. The resiliency of ports is es ...
  • Evaluating Recycling Efficiency of Asphalt Plants
    Evaluating Recycling Efficiency of Asphalt Plants
    Huang, Boashan ;
    Shu, Xiang
    2019-08-01 | PDF
    This study aims to determine recycling efficiency of mixtures containing recycled asphalt pavement (RAP) and recycled asphalt shingle (RAS) from different asphalt plants and to investigate the influence of mixture design and production conditions on recycling efficiency. A new procedure was developed by using fluorescence microscopy to differentiat ...
  • Investigating Tools for Evaluating Service and Improvement Opportunities on Bicycle Routes in Ohio
    Investigating Tools for Evaluating Service and Improvement Opportunities on Bicycle Routes in Ohio
    Akar, Gulsah ;
    Wang, Kailai
    2019-08-01 | PDF
    Over the past two decades, transportation engineers and urban planners have become increasingly interested in using performance measures to capture roadway infrastructure effects on bicyclists’ comfort levels. This study develops a useful tool to evaluate current service levels and identify improvement opportunities on Ohio’s local roadway network. ...
  • Emissions Benefits of Electric Vehicles in Uber and Lyft Services
    Emissions Benefits of Electric Vehicles in Uber and Lyft Services
    Jenn, Alan
    ORCID ICON IMG
    2019-08-01 | PDF
    Integrating electric vehicles (EVs) into vehicle fleets deployed by transportation network companies (TNCs; e.g., Uber and Lyft) is a particularly promising way to realize the benefits of vehicle electrification, due to the greater average miles traveled and passenger occupancy of TNC fleets. In this report, we examine EV use in TNC fleets from 201 ...
  • Proactive Traffic Safety Empowering Behaviors to Reach Our Shared Vision of Zero Deaths and Serious Injuries
    Proactive Traffic Safety: Empowering Behaviors to Reach Our Shared Vision of Zero Deaths and Serious Injuries
    Finley, Kari ;
    Otto, Jay
    2019-08-01 | PDF
    Growing proactive traffic safety is a novel approach that strategically shifts our focus to the engagement of the larger majority of safe road users to influence the behaviors of the smaller group engaging in risky behaviors. Previous research sponsored by the Traffic Safety Culture Pooled Fund to understand traffic safety citizenship revealed a va ...
  • Probability of Detection Study for Visual Inspection of Steel Bridges Volume 1 Executive Summary
    Probability of Detection Study for Visual Inspection of Steel Bridges: Volume 1— Executive Summary
    Campbell, Leslie E. ;
    Snyder, Luke R.
    2019-08-01 | PDF
    An inspector’s ability to correctly identify surface and internal defects in steel bridge components is critical to protecting public safety. Ensuring that inspectors are properly trained and adequately equipped to detect these defects in locations that are difficult to access and/or in unfavorable environmental conditions must be a high priority. ...
  • Investigation of Low Visibility Related Crashes in Florida Summary
    Investigation of Low Visibility Related Crashes in Florida [Summary]
    Lee, Jaeyoung
    ORCID ICON IMG
    2019-08-01 | PDF
    Researchers from the University of Central Florida developed a methodology for identifying areas of increased fog and/or smoke crashes in Florida. They focused on these areas to develop a more detailed map of specific hotpots.
  • Traffic Safety Culture A Primer for Traffic Safety Practitioners
    Traffic Safety Culture: A Primer for Traffic Safety Practitioners
    Ward, Nicholas J. ;
    Otto, Jay
    2019-08-01 | PDF
    There is growing interest in “traffic safety culture” (TSC) as a key factor to manage and sustain safe roadway transportation systems, especially as more jurisdictions adopt targets of zero traffic fatalities and serious injuries. However, the theory, terminology, and methods involved in addressing TSC come from human and social science disciplines ...
  • Quantifying the Performance of LowNoise Transverse Rumble Strips
    Quantifying the Performance of Low-Noise Transverse Rumble Strips
    Hurwitz, David S. ;
    Horne, Dylan
    2019-08-01 | PDF
    Transverse rumble strips (TRS) generate noise and vibration to alert drivers when they are approaching an intersection with traffic control, e.g. stop signs. TRS have been shown to reduce crashes up to 30% but have noise concerns (Finley et al., 2007). This study evaluated the feasibility of using shallow, epoxy filled TRS (EFTRS) as a substitute t ...
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