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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 5801 - 5820 of 36958 results
  • Handbook for Including Ancillary Assets Transportation Asset Management Programs
    Handbook for Including Ancillary Assets Transportation Asset Management Programs
    Allen, Brad W. ;
    Ram, Prashant
    2019-09-01 | PDF
    This handbook presents a methodology that will aid highway asset owners and maintenance personnel with determining what assets, beyond pavements and bridges, are most important to support their agencies' missions and goals. The methodology prioritizes asset classes and identifies data related to those assets that best support a performance-based ap ...
  • Measuring Temporal and Spatial Exposure of Urban Cyclists to Air Pollutants Using an Instrumented Bike
    Measuring Temporal and Spatial Exposure of Urban Cyclists to Air Pollutants Using an Instrumented Bike
    Schaffer, Kaitlyn G. ;
    Gadsby, April
    2019-09-01 | PDF
    Increased use of active transportation can make direct and indirect contributions toward addressing societal transportation issues. However, in the process of cycling for transportation, cyclists are exposed to multiple pollutants that could adversely impact their health. The goal of this study was to better understand the variation in PM2.5 exposu ...
  • StrainBased Fatigue Crack Monitoring of Steel Bridges using Wireless Elastomeric Skin Sensors
    Strain-Based Fatigue Crack Monitoring of Steel Bridges using Wireless Elastomeric Skin Sensors
    Li, Jian ;
    Bennett, Caroline
    2019-09-01 | PDF
    Fatigue cracks that develop in steel highway bridges under repetitive traffic loads are one of the major mechanisms that degrade structural integrity. If bridges are not appropriately inspected and maintained, fatigue cracks can eventually lead to catastrophic failures, in particular for fracture-critical bridges. Bridge owners, such as state Depar ...
  • HumanAutomation Teaming Unintended Impacts and Mitigations for Degraded NextGen Operations
    Human-Automation Teaming: Unintended Impacts and Mitigations for Degraded NextGen Operations
    Smith, Philip J. ;
    Baumann, Emily
    2019-09-01 | PDF
    The goal of this report is to provide insights regarding the potential unintended negative impacts that the introduction of automation can have on human performance and resultant system behavior when a decision support system fails or exhibits degraded performance. It further provides human factors guidance on methods to mitigate potential risks to ...
  • Investigation of the Accuracy of Alcohol and Drug Involvement Reporting
    Investigation of the Accuracy of Alcohol and Drug Involvement Reporting
    Staats, William
    2019-09-01 | PDF
    Researchers compared the 2013 to 2017 fatal crash data from the KSP database to the crash data from the FARS database to check the consistency and accuracy of alcohol and drug involvement reporting for drivers in the KSP database. The indications of alcohol and drug involvement in the FARS database were used as the ground truth due to the inclusion ...
  • Effectiveness of ExteriorBeam RotationPrevention Systems for Bridge Deck ConstructionPhase II
    Effectiveness of Exterior-Beam Rotation-Prevention Systems for Bridge Deck Construction—Phase II
    Hui, Li ;
    Hraib, Faress
    2019-09-01 | PDF
    During bridge deck construction, construction loads are transferred through the overhang-formwork system into the girder system, resulting in significant torsional moments acting on the exterior girder. In some cases, these torsional moments can lead to excessive exterior-girder rotation, thin bridge decks, and cause potential safety and maintenanc ...
  • Civil Engineering Support for the Traffic Monitoring Program
    Civil Engineering Support for the Traffic Monitoring Program
    Moses, Ren
    2019-09-01 | PDF
    Monitoring traffic through extensive collection and efficient storage of traffic data is crucial for improving safety and efficiency of Florida highways. To this end, the Florida Department of Transportation’s Office of Transportation Data and Analytics operates temporary and permanent count stations strategically placed at various locations on the ...
  • Development of Safety Performance Functions for Restricted Crossing UTurn RCUT Intersections Summary
    Development of Safety Performance Functions for Restricted Crossing U-Turn (RCUT) Intersections [Summary]
    Ozguven, Eren Erman
    2019-09-01 | PDF
    Florida State University researchers developed guidance to assist planners in deciding where to place restricted crossing U-turns (RCUTs).
  • Improving Pedestrian Infrastructure Inventory in Massachusetts Using Mobile LiDAR
    Improving Pedestrian Infrastructure Inventory in Massachusetts Using Mobile LiDAR
    Ai, Chengbo ;
    Hou, Qing
    2019-09-01 | PDF
    Pedestrian infrastructure is one of the most vital transportation infrastructures for pedestrians and wheelchair users who rely on quality sidewalks to facilitate safe and uninterrupted trips in their every day lives. To meet the obligations of the Americans with Disabilities Act (ADA) Transition Plan and to make informed investment decisions in tr ...
  • Development of a Test Method for Assessing the Performance of Vehicular Traffic Signal Assemblies during Hurricane Force Winds Summary
    Development of a Test Method for Assessing the Performance of Vehicular Traffic Signal Assemblies during Hurricane Force Winds [Summary]
    Azizinamini, Atorod
    2019-09-01 | PDF
    Florida International University researchers investigated methods for testing the behavior of traffic signals in high winds.
  • RemoteControlled Vessel Provides Safe and Accurate Inspection for Bridge Scour Summary
    Remote-Controlled Vessel Provides Safe and Accurate Inspection for Bridge Scour [Summary]
    Schroeder, Brian
    2019-09-01 | PDF
    MDOT routinely inspects bridges for scour around abutments and piers. These inspections are typically conducted from a boat during high-flow events, with inspectors probing the channel bottom or using sonar techniques to determine the extent of the scour. This can be very dangerous for bridge inspectors. As an alternative, an unmanned surface vesse ...
  • Human Factors Study on the Use of Colors for Express Lane Delineators
    Human Factors Study on the Use of Colors for Express Lane Delineators
    Abou-Senna, Hatem ;
    Radwan, Essam
    2019-09-01 | PDF
    The use of express lanes (ELs) in freeway traffic management has seen increasing popularity throughout the U.S., particularly in Florida. These lanes aim at increasing the efficiency of transportation system management and operations (TSM&O) to provide a more reliable trip. An important component of ELs is the channelizing devices used to delineate ...
  • Erosion and Sediment Control Design Guidance
    Erosion and Sediment Control Design Guidance
    Lampert, David ;
    Ahmadvand, Maryam
    2019-09-01 | PDF
    Construction projects typically require mass clearing and grading, causing many site areas to be unstable. As a result, they lack ground cover to protect against rainfall and runoff, which results in soil degradation and erosion. Erosion introduces nonpoint source suspended solids pollution (NPS) into water bodies that diminish water quality and re ...
  • Autonomous Vehicle Feasibility Study Final Report
    Autonomous Vehicle Feasibility Study – Final Report
    Jensen, Mark ;
    Andersen, Dan
    2019-09-01 | PDF
    Massive employment growth at the Tahoe Reno Industrial Center (TRIC), with housing stock primarily in the Reno/Sparks area – and a constrained transportation corridor (I-80) connecting the two – is leading to significant congestion with the potential to slow desired economic development in the region. In addition to other strategies under considera ...
  • A New Spectrum Matching Procedure for the Central United States
    A New Spectrum Matching Procedure for the Central United States
    Pezeshk, Shahram ;
    Sedaghati, Farhad
    2019-09-01 | PDF
    Central and eastern North America (CENA) is considered to be a moderately active region, but it suffers from a lack of recorded earthquakes in the magnitude-distance range of engineering interest. In this report, region-specific synthetic strong ground motion time histories are generated using a new and improved stochastic summation of Green's func ...
  • Development of Statistical Models to Predict the Compressibility of Floridas Soils
    Development of Statistical Models to Predict the Compressibility of Florida’s Soils
    Nam, Boo Hyun ;
    Shamet, Ryan
    2019-09-01 | PDF
    The magnitude of the overall settlement depends on several variables such as compression index (Cc), recompression index (Cr), and secondary compression index (Cα), which are determined by a consolidation test. However, the test is time consuming and labor intensive. Correlations have been developed to approximate these compressibility indexes to s ...
  • Evaluation of Guardrail Needs and Update of Guardrail Rating Program
    Evaluation of Guardrail Needs and Update of Guardrail Rating Program
    Howell, Brian K. ;
    Staats, William
    2019-09-01 | PDF
    The Kentucky Transportation Cabinet (KYTC) seeks to reduce the frequency of roadway departure crashes, which often prove fatal. Roadside barriers such as guardrail have proven effective at mitigating these crashes, however, the demand for installations is high throughout the state. KYTC must prioritize prospective guardrail locations to match avail ...
  • Analysis of 54Inch Tall SingleSlope Concrete Barrier on a Structurally Independent Foundation
    Analysis of 54-Inch Tall Single-Slope Concrete Barrier on a Structurally Independent Foundation
    Sheikh, Nauman M. ;
    Kovar, James C.
    2019-09-01 | PDF
    This project developed structurally independent foundation designs for 54-inch tall single slope concrete barrier (SSCB) for shielding bridge columns near roadsides that do not meet Texas Department of Transportation’s (TxDOT’s) design impact load criteria. Such columns are required to be shielded with a 54-inch tall barrier with an independent fou ...
  • Evaluation of Overlay Tester Test Procedure to Identify Fatigue Cracking Prone Asphalt Mixtures
    Evaluation of Overlay Tester Test Procedure to Identify Fatigue Cracking Prone Asphalt Mixtures
    Bennert, Thomas ;
    Haas, Edwin
    2019-09-01 | PDF
    Fatigue cracking is a major problem on asphalt pavements and airfields. Design and production procedures continually result in lean asphalt mixtures, while the use of recycled asphalt pavement (RAP) and recycled asphalt shingles (RAS) increases the relative stiffness and aged condition of the asphalt mixture, significantly decreasing the material's ...
  • Assessment of Planning Risks and Alternative Futures for the Florida Transportation Plan Update FDOT BDV2597757
    Assessment of Planning Risks and Alternative Futures for the Florida Transportation Plan Update [FDOT BDV25-977-57]
    Williams, Kristine M ;
    Boyd, Tia
    2019-09-01 | PDF
    Transportation is in a period of transformation as technology offers new ways to travel, shop, ship goods, and do business. Rapid technological changes, along with changing demographics, extreme weather events, fluctuating revenues, and other potential disruptors, have increased uncertainty in long-range transportation plans and forecasts. To addre ...
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