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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 5001 - 5020 of 36908 results
  • Winter Operations Decision Support Tools for the Iowa DOT Maintenance Bureau
    Winter Operations Decision Support Tools for the Iowa DOT Maintenance Bureau
    Hawkins, Neal ;
    Knickerbocker, Skylar
    2020-06-01 | PDF
    This research serves as a beginning point to explore new ways to support timely and accurate decision making during winter operations given the massive stream of data coming from the Iowa Department of Transportation (DOT) snowplow fleet. The Iowa DOT Maintenance Bureau manages roughly 900 snowplows, which are equipped and continuously transmitting ...
  • Dynamic Travel Time Estimation for Northeast Illinois Expressways
    Dynamic Travel Time Estimation for Northeast Illinois Expressways
    Mohammadian, Abolfazl ;
    Taghipour, Homa
    2020-06-01 | PDF
    Having access to accurate travel time is critical for both highway network users and traffic operators. Travel time that is currently reported for most highways is estimated by employing naïve methods that use limited sources of data. This might result in inaccurate travel time prediction and could impose difficulties on travelers. The purpose of t ...
  • Data Trends and Variability in Quality Control for Performance and Pay for Performance Specifications Statistical Analysis
    Data Trends and Variability in Quality Control for Performance and Pay for Performance Specifications: Statistical Analysis
    Al-Qadi, Imad L ;
    Rivera-Perez, José
    2020-06-01 | PDF
    Quality assurance programs for hot-mix asphalt (HMA) have evolved from method specifications to quality assurance specifications that distribute responsibilities and risks between contractors and owners. The Illinois Department of Transportation (IDOT) developed two acceptance specifications, quality control for performance (QCP) and pay for perfor ...
  • Case Studies Using Quality Control for Performance and Pay for Performance Specifications Field Observations
    Case Studies Using Quality Control for Performance and Pay for Performance Specifications: Field Observations
    Al-Qadi, Imad L ;
    Rivera-Perez, José
    2020-06-01 | PDF
    Quality assurance programs for hot-mix asphalt (HMA) have evolved from method to quality assurance specifications that distribute responsibilities and risks between contractors and owners. The Illinois Department of Transportation developed two acceptance specifications, quality control for performance (QCP) and pay for performance (PFP), integrati ...
  • ShortTerm Skid Improvements by Light Texturing with a Milling Machine
    Short-Term Skid Improvements by Light Texturing with a Milling Machine
    Gao, Lu ;
    Smit, Andre de Fortier
    2020-06-01 | PDF
    Skid problems on roads can result from flushing and bleeding where excessive road-mix binder can accumulate on a road’s surface as well as general wear of the surface by traffic. This may result in a polished surface that may increase the chances of accidents due to the reduced skid resistance. Strategies to address this problem include mill and fi ...
  • Speed Control of Brushless DC Motor by DCDC Boost and Buck Converters Using GaN and SiC Transistors for Implementing the Electric Vehicles
    Speed Control of Brushless DC Motor by DC-DC Boost and Buck Converters Using GaN and SiC Transistors for Implementing the Electric Vehicles
    Rahmani, Fatemeh ;
    Quispe, David
    2020-06-01 | PDF
    Significant improvements of the DC-DC converters create the straightforward method to control the speed of the DC motor. One of the important DC motors is the Brushless DC motor which is utilized in various electrical fields. This paper focuses on the control at different speeds for a Brushless DC motor. In order to make the proper voltage to run t ...
  • The Modified Brandeis Dice for the Traffic States Dependency The IDice Problem
    The Modified Brandeis Dice for the Traffic States Dependency: The I-Dice Problem
    Kosun, Caglar ;
    Ozdemir, Serhan
    2020-06-01 | PDF
    Brandeis dice example is a toy example discussed by Jaynes to explain the maximum entropy principle. A die is tossed many times and an average number of spots is revealed. If other than 3.5, die is obviously not an honest one. Probabilities are then assigned for the next toss. This example is contested on the finite sampling grounds. The authors us ...
  • Research on School Zone Safety
    Research on School Zone Safety
    Khattak, Aemal J. ;
    Kang, Yashu
    2020-06-01 | PDF
    This research investigated different aspects of school zone safety including the effects of speed differentials on drivers’ speeds in active school zones, the effects of school and surrounding characteristics on drivers’ speeds in active school zones, and the safety benefits and costs associated with active school zones. The research team identifie ...
  • Permeable Pavement for Road Salt Reduction
    Permeable Pavement for Road Salt Reduction
    Erickson, Andrew J ;
    Gulliver, John S.
    2020-06-01 | PDF
    Road salt and particularly sodium chloride is used for de-icing roadways during winter months in cold climates but can have a negative impact on the environment. This report describes research that investigated the use of permeable pavements that are not treated with road salt as an alternative to impermeable pavement surfaces that are treated with ...
  • 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 ...
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