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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 6241 - 6260 of 36049 results
  • Quantifying the Range of Variability in the Flexural Strength of Fiber Reinforced Concrete Using Monte Carlo Simulation Research Brief
    Quantifying the Range of Variability in the Flexural Strength of Fiber Reinforced Concrete Using Monte Carlo Simulation [Research Brief]
    Ghadban, Ahmad A. ;
    Wehbe, Nadim I.
    2018-12-01 | PDF
    Many laboratory studies have shown erratic results in flexural strength among replicate specimens of Fiber reinforced concrete (FRC). As a result, repeatability of results was very challenging. Given this issue, it would be very difficult for design engineers to make reliable claims about the performance of a certain FRC element in the field. The o ...
  • The Right Structure for the Right Incentives for Multimodal Transportation in Americas Growing Megaregions
    The Right Structure for the Right Incentives for Multimodal Transportation in America’s Growing Megaregions
    Hunn, Alexander ;
    Lin, Roxanne Jung-Hsuan
    2018-12-01 | PDF
    Advancements in technology and changes in population demographics have caused the transportation situation of the 21st century to outgrow the legal framework made to support it in the 20th. This project analyzed the legal framework of American transportation funding in the context of modern developments and in comparison to those of Germany and Chi ...
  • Infrastructure Inspection During and After Unexpected EventsPhase I
    Infrastructure Inspection During and After Unexpected Events-Phase I
    Rahmatalla, Salam ;
    Karimpour, Ali
    2018-12-01 | PDF
    This report presents the development of a vibration-based damage-detection methodology for the structural health monitoring and damage detection of vital line structures and highway bridges under extreme conditions, including seismic and water interactions. The damage-detection method uses the transmissibility function-the ratio between the output ...
  • Offset RightTurn Lanes on State Highway Systems
    Offset Right-Turn Lanes on State Highway Systems
    Khattak, Aemal ;
    Kang, Yashu
    2018-12-01 | PDF
    This research focused on two aspects related to Offset Right Turn Lanes (ORTLs) on Nebraska state highway two-way stop-controlled intersections. The first was the crash safety and economic benefits of ORTLs compared to intersections with no right turn lanes or traditional right turn lanes. The second was driver stopping behavior at stop signs at tw ...
  • Connected Vehicles Based Traffic Signal Timing Optimization
    Connected Vehicles Based Traffic Signal Timing Optimization
    Li, Wan ;
    Ban, Xuegang (Jeff)
    2018-12-01 | PDF
    We study the traffic signal control problem with connected vehicles (CVs) by assuming a fixed cycle length so that the proposed model can be extended readily for the coordination of multiple signals. The problem can be first formulated as a mixed-integer nonlinear program, by considering information of individual vehicle’s trajectories (i.e., secon ...
  • Asymmetric Information Sharing in Dialysis Paratransit using an Agency Approach
    Asymmetric Information Sharing in Dialysis Paratransit using an Agency Approach
    Lind, Mary R. ;
    Hensley, Rhonda L.
    2018-12-01 | PDF
    Dialysis patient transit services presents an agency problem (Eisenhardt, 1989) where the county paratransit operator is the agent that provides the principal, the dialysis center, transport of dialysis patients to their centers under conditions of incomplete and asymmetric information. The agent (paratransit) collects riders in need of paratransit ...
  • Life Cycle Assessment of Environmental and Economic Impacts of Deploying Alternative Urban Bus Powertrain Technologies in the South Coast Air Basin
    Life Cycle Assessment of Environmental and Economic Impacts of Deploying Alternative Urban Bus Powertrain Technologies in the South Coast Air Basin
    Munoz, Analy Castillo ;
    Tarroja, Brian
    2018-12-01 | PDF
    To address issues of air quality and greenhouse gas emissions in the South Coast Air Basin, local transit agencies are considering shifting their urban buses to battery electric buses (BEBs) and hydrogen fuel cell electric buses (FCEBs). However, each of these options vary in their effectiveness in reducing emissions over their life cycle, associat ...
  • Effect of Increased Asphalt Pavement Density on its Durability Research Project Capsule
    Effect of Increased Asphalt Pavement Density on its Durability [Research Project Capsule]
    Mohammad, Louay ;
    Rupnow, Tyson
    2018-12-01 | PDF
    In-place density is one of the most important factors influencing the performance of an asphalt pavement. The desired level of construction density in asphalt layers in the field is achieved by means of roller compaction.
  • Subsidizing Mass Adoption of Electric Vehicles QuasiExperimental Evidence from California
    Subsidizing Mass Adoption of Electric Vehicles: Quasi-Experimental Evidence from California
    Muehlegger, Erich J ;
    Rapson, David S
    2018-12-01 | PDF
    Little is known about demand for EVs in the mass market. In this paper, we exploit a natural experiment that provides variation in large EV subsidies targeted at low- and middle-income households in California. Using transaction-level data, we estimate two important policy parameters using triple differences: the subsidy elasticity of demand for EV ...
  • Feasibility Study for Rapid Evaluation of Bridge Decks
    Feasibility Study for Rapid Evaluation of Bridge Decks
    Ziehl, Paul H. ;
    Huynh, Nathan N.
    2018-12-01 | PDF
    The South Carolina Department of Transportation utilizes different methods for concrete bridge deck evaluation including visual inspection and chain dragging. The current methods for concrete bridge deck evaluation are effective, but they require traffic control and many operators. To address these limitations, this project investigates rapid evalu ...
  • Design Prototyping and Field Testing a DemandResponsive Rumble Strip Mechanism
    Design, Prototyping and Field Testing a Demand-Responsive Rumble Strip Mechanism
    Paz, Alexander ;
    Trabia, Mohamed
    2018-12-01 | PDF
    This project involved the development, design, prototyping and testing of a Demand-Responsive Transverse Rumble Strip (DRTRS) mechanism, which becomes active (lowers an array of strips) only when necessary in order to alert drivers of downstream risks. Three alternative mechanisms for the deployment of DRTRS were designed and evaluated. A first pro ...
  • Updating and Implementing the Grade Severity Rating System for Wyoming Mountain Passes Evaluating the Safety Effectiveness of Downgrade Warning Signs Volume 2
    Updating and Implementing the Grade Severity Rating System for Wyoming Mountain Passes: Evaluating the Safety Effectiveness of Downgrade Warning Signs [Volume 2]
    Moomen, Milhan ;
    Raja, Mustaffa Ngah
    2018-12-01 | PDF
    Truck safety on mountain passes presents a major challenge to most highway agencies in western United States. Large trucks are known to be disproportionately affected on severe downgrades which characterize mountain passes in comparison to other vehicle classes due to large sizes and heavy loads. The Wyoming Department of Transportation in an effor ...
  • Guide for Seasonal Adjustment and Crowdsourced Data Scaling
    Guide for Seasonal Adjustment and Crowdsourced Data Scaling
    Dadashova, Bahar ;
    Griffin, Greg
    2018-12-01 | PDF
    This guide describes two different adjustment processes that can be used with pedestrian and bicyclist data. The first adjustment process is seasonal adjustment, which is applied to short-duration counts that are collected during a specific month of the year. Seasonal adjustment annualizes the short-duration counts, such that the resulting adjusted ...
  • A Threshold to Utilize Guayule Resin as a New Binder in Flexible Pavement Industry
    A Threshold to Utilize Guayule Resin as a New Binder in Flexible Pavement Industry
    Hemida, Ahmed ;
    Abdelrahman, Magdy
    2018-12-01 | PDF
    This study denotes a threshold to utilize Guayule Resin as a new bio-based binder or asphalt cement (AC) proportion, both with/out crumb rubber modifier (CRM), regarding solutions for environment, cost, and sustainability aspects. Via this research, 15 designated binders will be presented, all of them were tested as unaged and RTFO, whereas eight b ...
  • Columbus Mississippi Field Aging and Laboratory Conditioning Study Plant Mixed and Field Compacted Asphalt Test Sections
    Columbus Mississippi Field Aging and Laboratory Conditioning Study: Plant Mixed and Field Compacted Asphalt Test Sections
    Smith, Braden T. ;
    Howard, Isaac L.
    2018-12-01 | PDF
    The main objective of this report was to characterize the effects of short and long term aging for a full-scale and non-trafficked asphalt test section originally built as part of an emergency paving demonstration. The primary data sets collected for this overall body of work are from full-scale constructed test sections where cores were collected ...
  • BioBased Renewable Additives for Antiicing Applications Phase II
    Bio-Based Renewable Additives for Anti-icing Applications (Phase II)
    Nazari, Mehdi Honarvar ;
    Oh, Taekil
    2018-12-01 | PDF
    The performance and impacts of several agro-based anti-icers along with a traditional chloride-based anti-icer (salt brine) were evaluated. A statistical design of experiments (central composite design) was employed for developing anti-icing liquids consisting of cost-competitive chemicals such as agro-based compounds (e.g., Concord grape extract a ...
  • Material Design and Structural Configuration of Link Slabs for ABC Applications
    Material Design and Structural Configuration of Link Slabs for ABC Applications
    Shafei, Behrouz ;
    Taylor, Peter C.
    2018-12-01 | PDF
    Accelerated Bridge Construction (ABC) is now being widely used by the Departments of Transportation because of the reductions of traffic disruption, social cost, environmental impact, and lost time. ABC is also known to improve the work-zone safety, on-site constructability, and project completion time. One of the common techniques in ABC is using ...
  • Investigation of Kentucky ForHire Requirements
    Investigation of Kentucky For-Hire Requirements
    Martin, Andrew ;
    Keathley, Valerie
    2018-12-01 | PDF
    This study analyzes the costs and benefits of the Kentucky For-Hire operating authority, which is issued to all carriers who pick up and drop off freight in Kentucky on a for-hire basis. It reviews current statutory and regulatory requirements, calculates the costs and benefits of administering Kentucky For-Hire, reviews the legal history of trucki ...
  • RealTime Flood Forecasting for River Crossings
    Real-Time Flood Forecasting for River Crossings
    Krajewski, Witold ;
    Mantilla, Ricardo
    2018-12-01 | PDF
    We have developed a generic prototype of a flood-forecasting model transferable to other locations around the Midwest to provide monitoring and forecasting flood potential at critical infrastructure points, such as bridges, where streamflow gauges are not available. A real-time web-based visualization platform to display the model predictions has b ...
  • The CostEffectiveness of Alternative Policies for Reducing GHG emissions in the Freight Sector Brief
    The Cost-Effectiveness of Alternative Policies for Reducing GHG emissions in the Freight Sector [Brief]
    Bento, Antonio M. ;
    Giuliano, Genevieve
    2018-12-01 | PDF
    We develop a novel simulation that integrates aspects of route-level and multi-market models to evaluate the cost-effectiveness of alternative public policies that stimulate a faster adoption of cleaner technologies to reduce GHG emissions in the freight sector. The route-level model adds important spatial features that influence fuel consumption a ...
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