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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 36958 results
  • SegmentLevel Crash Risk Analysis for New Jersey Highways Using Advanced Data Modeling
    Segment-Level Crash Risk Analysis for New Jersey Highways Using Advanced Data Modeling
    Dimitrijevic, Branislav ;
    Khales, Sina Darban
    2020-06-01 | PDF
    Highway crashes are the most significant challenge to the goal of providing a safe and efficient highway transportation system. They result in significant societal toll reflected in numerous fatalities, personal injuries, property damage, and traffic congestion. To that end, much attention has been given to developing models to study and predict cr ...
  • Assessing Complete Street Strategies Using Microscopic Traffic Simulation Models
    Assessing Complete Street Strategies Using Microscopic Traffic Simulation Models
    Liu, Bernice ;
    Shams, Alireza
    2020-06-01 | PDF
    Authors of this research developed a traffic simulation model for the downtown San Jose network and evaluated five different street redesign and travel demand combinations. This model aids understanding of network-wide effects of changes in street design for local and regional agencies who are interested in implementing complete streets and/or one- ...
  • Matching the Speed of Technology With the Speed of Local Government Developing Codes and Policies Related to the Possible Impacts of New Mobility on Cities
    Matching the Speed of Technology With the Speed of Local Government: Developing Codes and Policies Related to the Possible Impacts of New Mobility on Cities
    Schlossberg, Marc ;
    Brinton, Heather
    2020-06-01 | PDF
    Advances in transportation technology such as the advent of scooter and bikeshare systems (micromobility), ridehailing, and autonomous vehicles (AV’s) are beginning to have profound effects not only on how we live, move, and spend our time in cities, but also on urban form and development itself. These new technologies are changing the systems of t ...
  • What Do Americans Think About Federal Tax Options to Support Transportation Results from Year Eleven of a National Survey
    What Do Americans Think About Federal Tax Options to Support Transportation? Results from Year Eleven of a National Survey
    Agrawal, Asha Weinstein ;
    Nixon, Hilary
    2020-06-01 | What Do Americans Think About Federal Tax Options to Support Transportation? | PDF
    This report summarizes the results from the eleventh year of a national public opinion survey asking U.S. adults questions related to their views on federal transportation taxes. A nationally-representative sample of 2,515 respondents completed the online survey between February 14 and 28, 2020. The questions test public opinions about raising the ...
  • Assessing the Variation of Curbside Safety at the City Block Level
    Assessing the Variation of Curbside Safety at the City Block Level
    Medury, Aditya ;
    Vlachogiannis, Dimitris
    2020-06-01 | PDF
    Investigating the dynamics behind the likelihood of vehicle crashes has been a focal research point in the transportation safety field for many years. However, the abundance of data in today's world generates opportunities for deeper comprehension of the various parameters affecting crash frequency. This study incorporates data from many different ...
  • Improving the Use of Crack Sealing to Asphalt Pavement in Louisiana
    Improving the Use of Crack Sealing to Asphalt Pavement in Louisiana
    Elseifi, Mostafa A. ;
    Mousa, Momen R
    2020-06-01 | PDF
    The use of crack sealing in Louisiana has been limited as studies conducted in the 1960s showed that the performance of this maintenance practice can be affected by shallow groundwater table conditions in the state. The objective of this study was twofold. First, this project quantified the short-term and long-term benefits of using crack sealing, ...
  • PerformanceBased Specifications of FiberReinforced Concrete with Adapted Rheology to Enhance Performance and Reduce SteelReinforcement in Structural Members
    Performance-Based Specifications of Fiber-Reinforced Concrete with Adapted Rheology to Enhance Performance and Reduce Steel-Reinforcement in Structural Members
    Khayat, Kamal H.
    ORCID ICON IMG
    2020-06-01 | PDF
    The main objective of this research is to propose novel materials for the construction and retrofitting of bridges, including Economical Crack-Free High-Performance Concrete (Eco-Bridge-Crete, or EBC) and Fiber-Reinforced Super-Workable Concrete (FR-SWC). The project seeks to optimize the coupled effect of fiber characteristics, expansive agent (EA ...
  • Equity Assessment of PlugIn Electric Vehicle Purchase Incentives With a Focus on Atlanta Georgia
    Equity Assessment of Plug-In Electric Vehicle Purchase Incentives With a Focus on Atlanta, Georgia
    Liu, Haobing ;
    Guensler, Randall
    2020-06-01 | PDF
    To help consumers overcome higher initial purchase costs of plug-in hybrid and battery-electric vehicles (collectively PEVs), and to help promote PEV adoption, government agencies and electric utilities have offered a variety of purchase and leasing incentives over time. While the PEV population has grown rapidly since 2011, the PEV market share an ...
  • 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 ...
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