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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 5481 - 5500 of 36022 results
  • Preparing for Progress Establishing Guidelines for the Regulation Safe Integration and Equitable Usage of Dockless Electric Scooters in American Cities
    Preparing for Progress: Establishing Guidelines for the Regulation, Safe Integration, and Equitable Usage of Dockless Electric Scooters in American Cities
    Wood, James ;
    Bradley, Samantha
    2019-08-01 | PDF
    Personal electric scooters (also called e-scooters) have quickly gained attention in Western cities as a novel means of transportation. As community leaders seek a new generation of mobility options, e-scooters represent great promise but also considerable complexity. These privately-funded vehicles operate generally without much regulation, and ma ...
  • Implement Balanced Asphalt Mix Design in Oklahoma
    Implement Balanced Asphalt Mix Design in Oklahoma
    Cross, Stephen A. ;
    Li, Joshua
    2019-08-01 | PDF
    The objective of this study was to evaluate selected ODOT mixtures to assist with determining test procedures, specifications and special provisions for evaluation and eventual adaptation of a BMD procedure for ODOT. The test plan was developed by ODOT and consisted of evaluating I-FIT test results from 31 existing mixes and I-FIT and Ideal CT Inde ...
  • Performance Evaluation of Inverted Tee IT Bridge System
    Performance Evaluation of Inverted Tee (IT) Bridge System
    Martindale, Garret ;
    Watson, Daniel
    2019-08-01 | PDF
    The Inverted Tee (IT) girder bridge system was originally developed in 1996 by the University of Nebraska–Lincoln (UNL) researchers and Nebraska Department of Transportation (NDOT) engineers. This bridge system currently accounts for over 110 bridges in Nebraska used for both state highways and local county roads. Extensive longitudinal and transve ...
  • Synthesis of Precast Column Designs for Texas Bridges Project Summary
    Synthesis of Precast Column Designs for Texas Bridges [Project Summary]
    Murcia-Delso, Juan ;
    Bayrak, Oguzhan
    2019-08-01 | PDF
    Using prefabricated bridge elements and systems minimizes on-site operations and closure times during bridge construction and contributes to improving durability and reducing the environmental impact of construction. Prefabrication of bridge columns has been very limited as compared to bridge superstructures and bent caps. Nevertheless, some states ...
  • 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 ...
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