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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 4581 - 4600 of 36020 results
  • Laboratory Investigation of Underwater Concreting
    Laboratory Investigation of Underwater Concreting
    Ozyildirim, H. Celik ;
    Sharifi, Mary
    2020-06-01 | PDF
    Concrete and grout with minimal washout are required for underwater placements from both a structural and environmental perspective. Resistance to washout and consolidation are factors difficult to achieve underwater using conventional concretes or grouts. Cohesive and self-consolidating concrete and grouts could provide the needed washout resistan ...
  • Laboratory Investigation of Workable and Durable Concretes for Bridge Repair
    Laboratory Investigation of Workable and Durable Concretes for Bridge Repair
    Ozyildirim, H. Celik ;
    Sharifi, Mary
    2020-06-01 | PDF
    Concretes for bridge repair that attained 3,000 psi compressive strength within 10 hours, 1 day, and 7 days and had high workability and durability were investigated in the laboratory. Supplementary cementitious materials (SCMs) were used in concrete with portland cement to make the mixture resist the penetration of harmful solutions and chemical a ...
  • Understanding Connected and Automated Vehicles Impacts on Utah Transportation Planning
    Understanding Connected and Automated Vehicles’ Impacts on Utah Transportation Planning
    Wang, Qinzheng ;
    Yang, Xianfeng (Terry)
    2020-06-01 | PDF
    With the rapid and continuous improvements in communication and detection technologies, connected and automated vehicles (CAVs) are being brought to the transportation network and various CAV applications have been developed rapidly in the past few years. Early implementations of CAV technology have shown great potential benefits in improving safet ...
  • Consumer Preferences for EcoFriendly Attributes in Disposable Dinnerware
    Consumer Preferences for Eco-Friendly Attributes in Disposable Dinnerware
    Gill, MacKenzie B ;
    Jensen, Kimberly L
    2020-06-01 | PDF
    The United States (US) uses landfills to dispose paper cups at a rate of 40 percent. Landfill rates on plastic disposable dinnerware are even higher at around 80 percent. This study examines consumer preferences for single-use disposable dinnerware with the attributes: uses no trees; contains no plastic; made from agricultural crop byproduct cellul ...
  • Evaluation of Interventions To Reduce Distracted Driving in Idaho
    Evaluation of Interventions To Reduce Distracted Driving in Idaho
    Otto, Jay ;
    Ward, Nicholas J.
    2020-06-01 | PDF
    The National Highway Traffic Safety Administration (NHTSA) defines distracted driving as engaging in any activities that take the driver’s attention away from the task of driving. In Idaho, distracted driving was a contributing factor in about one in five (21 percent) of all fatal crashes and more than one quarter (27 percent) of all crashes involv ...
  • Examining the Required Cement Content
    Examining the Required Cement Content
    Casillas, Bryan ;
    Almutairi, Waleed
    2020-06-01 | PDF
    Portland cement is a significant component in a concrete mixture. For concrete used in portland cement concrete pavement (PCCP), Class S, and Class S(AE) concrete, the Arkansas Department of Transportation specifies a minimum cementitious material content of 564 lb/yd3 and 611 lb/yd3, respectively. Prior research conducted at the University of Arka ...
  • Evaluation of the Cracking Performance of Asphalt Binders at Intermediate Temperatures
    Evaluation of the Cracking Performance of Asphalt Binders at Intermediate Temperatures
    Roque, Reynaldo ;
    Yan, Yu
    2020-06-01 | PDF
    The major objective of this research was to identify a binder parameter to effectively characterize binder cracking performance at intermediate temperatures. A laboratory experimental plan was developed that included six asphalt binders and twelve mixtures of two aggregate types. The linear amplitude sweep (LAS) test and the binder fracture energy ...
  • Durability of Fiber Reinforced Concrete Pipe Exposed to Florida Aggressive Environments
    Durability of Fiber Reinforced Concrete Pipe Exposed to Florida Aggressive Environments
    Presuel-Moreno, Francisco J ;
    Flaherty, Ryan
    2020-06-01 | PDF
    Four different types of synthetic fibers were used in this investigation to prepare synthetic fiber-reinforced concrete resembling dry-cast concrete. The first two fiber types were polyvinyl alcohol (30 mm) and a blend of polypropylene and polyethylene (51 mm). The other two fibers were polypropylene (50 mm), one of the polypropylene synthetic fibe ...
  • Evaluation of Alternative Rumble Strip Designs
    Evaluation of Alternative Rumble Strip Designs
    Staats, William ;
    Agent, Ken
    2020-06-01 | PDF
    Since Kentucky’s initial rumble strip designs were adopted, there has been additional research and experimentation in other states with alternative designs as a response to complaints from the public about noise pollution caused by rumble strips. The new research indicates that other rumble strip designs might provide increased interior noise/vibra ...
  • Impacts of Changing the Transit Signal Priority Requesting Threshold on Bus Performance and General Traffic A Sensitivity Analysis
    Impacts of Changing the Transit Signal Priority Requesting Threshold on Bus Performance and General Traffic: A Sensitivity Analysis
    Schultz, Grant G. ;
    Sheffield, Michael H
    2020-06-01 | PDF
    A sensitivity analysis was performed on the transit signal priority (TSP) requesting threshold to evaluate its impact on bus performance and general traffic. Route 217, a conventional bus route, and the Utah Valley Express (UVX), a bus rapid transit line, utilize a dedicated short-range communication (DSRC)-based TSP system as part of their normal, ...
  • Addressing Oregons Rise in Deaths and Serious Injuries for Senior Drivers and Pedestrians
    Addressing Oregon’s Rise in Deaths and Serious Injuries for Senior Drivers and Pedestrians
    Monsere, Christopher ;
    Kothuri, Sirisha
    2020-06-01 | PDF
    The research reviewed best practices, identified overrepresentations of serious crashes involving older drivers and pedestrians using Oregon crash data, and mapped the best practices and countermeasures. From 2013 to 2016, there were 884 older driver and 112 older pedestrian fatal and serious injury crashes. Older driver fatal and serious injury cr ...
  • Congestion Reduction Through Efficient Empty Container Movement Under Stochastic Demand
    Congestion Reduction Through Efficient Empty Container Movement Under Stochastic Demand
    Dessouky, Maged M. ;
    Carvajal, Santiago
    2020-06-01 | PDF
    In today’s world, there is a significant amount of investigation regarding how to efficiently distribute loaded containers from the ports to the consignees. However, to fully maximize the process and become more environmentally friendly, one should also study how to allocate the empty containers created by these consignees. This is an essential par ...
  • Best Management Practices for PostConstruction Restoration of RightsofWay in Saltwater Marshes Estuaries and Other Tidally Influenced Areas
    Best Management Practices for Post-Construction Restoration of Rights-of-Way in Saltwater Marshes, Estuaries, and Other Tidally Influenced Areas
    Christian, Jason ;
    Kim, Sonny
    2020-06-01 | PDF
    Saltwater marshes or salt marshes are capable of providing to fauna and flora a biologically desirable environment while operating as a sink for sequestering large amounts of heavy metals. Salt marshes have the highest value of net primary productivity among terrestrial and wetland ecosystems and are adversely impacted and threatened by land-use ch ...
  • Impact of Crosswalk Lighting Improvements on Pedestrian SafetyA Literature Review
    Impact of Crosswalk Lighting Improvements on Pedestrian Safety–A Literature Review
    Mitran, Elisabeta ;
    Codjoe, Julius
    2020-06-01 | PDF
    This study conducted a nationwide literature review to obtain the state of knowledge on the relationship between lighting conditions and pedestrian crashes, assessing how lighting countermeasures at crosswalks improve pedestrian safety. The study gathered information on crosswalk lighting treatments, existing national guidelines for lighting at ped ...
  • Educational and Workforce Development Through Creation of Programs in Transportation To Generate Future Careers for Our Students in Navajo Nation Region
    Educational and Workforce Development Through Creation of Programs in Transportation To Generate Future Careers for Our Students in Navajo Nation Region
    Ehteshami, Gholam R
    ORCID ICON IMG
    2020-06-01 | PDF
    Navajo Technical University (NTU) in New Mexico, has made a partnership with the Tran-SET regional center at Louisiana State University, LSU. We have provided learning and training the Native American students in transportation-related Industries to some of STEM students at NTU through these partnerships opportunities. The program was designed and ...
  • Evaluation of Cost Effectiveness Performance and Selection Criteria for Concrete Structures
    Evaluation of Cost Effectiveness, Performance, and Selection Criteria for Concrete Structures
    Pei, Shiling ;
    Wehbe, Nadim I.
    2020-06-01 | PDF
    A study was conducted to develop recommendations for short span concrete structure type selection based on analyses of existing structure costs and performance data from South Dakota roadway systems. Through a combination of data sources, including the PONTIS database, local owner and inspector surveys, past project bidding costs, and typical bridg ...
  • KYTC Maintenance Field Operations Guide Supplement
    KYTC Maintenance Field Operations Guide Supplement
    Gibson, Bryan ;
    Wallace, Candice
    2020-06-01 | PDF
    The Kentucky Transportation Cabinet (KYTC) is tasked with managing an asset portfolio that includes over 27,500 miles of roadway and 9,000 bridges. Keeping these assets in sound condition demands significant effort from KYTC’s Division of Maintenance, which includes activities ranging from mowing and litter pickup to cleaning out culverts and perfo ...
  • Implementation of Measuring While Drilling Shafts in Florida FLMWDS
    Implementation of Measuring While Drilling Shafts in Florida (FLMWDS)
    McVay, Michael ;
    Rodgers, Michael
    2020-06-01 | PDF
    Measuring while drilling (MWD) is the application of monitoring and recording drilling data during the drilling process. Recent geotechnical MWD efforts have shown that specific energy obtained from MWD can be directly correlated to the unconfined compression strength (qu) of rock. This is advantageous as foundations and structures supported by roc ...
  • Development of a Procedure for Evaluating and Approving Liquid AntiStrip Agents
    Development of a Procedure for Evaluating and Approving Liquid Anti-Strip Agents
    Karki, Pravat ;
    Arambula-Mercado, Edith
    2020-06-01 | PDF
    The objectives of this project were to determine the extent to which liquid anti-strip agents (ASAs) can affect asphalt mixture stability during and after construction, determine the effective laboratory methods/procedures to evaluate asphalt mixture stability, and develop an approval system for liquid ASA with respect to mixture stability. The pro ...
  • Uncertainty Quantification of Cyber Attacks on Connected Vehicles and Infrastructure Part 1
    Uncertainty Quantification of Cyber Attacks on Connected Vehicles and Infrastructure (Part 1)
    Martin, James J ;
    Comert, Gurcan
    2020-06-01 | PDF
    Multiple studies have explored different forms of connected vehicle applications, such as queue warning and cooperative adaptive cruise control (CACC), in standard wireless access in vehicular environments (WAVE), and dedicated short-range communication (DSRC) network environments. A major focus of the ongoing research is to consider a hybrid vehic ...
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