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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 4661 - 4680 of 36020 results
  • ADA Accessible Trail Improvement With Naturally Occurring Sustainable Materials
    ADA Accessible Trail Improvement With Naturally Occurring, Sustainable Materials
    Sleep, Matthew ;
    Matzen, Damian
    2020-05-01 | PDF
    The Americans with Disabilities Act (ADA) provides specific guidelines and requirements that must be met in terms of accessibility. However, in the case of unpaved trails, the requirements are less defined. An ADA trail must be firm, stable and slip resistant. Some compacted aggregate material may meet this definition, but degrade over time and can ...
  • Field Performance of HES Class 50AF Concrete With Fibers As FieldCast Connection Between Deck BulbT Girders in ABC Applications
    Field Performance of HES Class 50AF Concrete With Fibers As Field-Cast Connection Between Deck Bulb-T Girders in ABC Applications
    Ebrahimpour, Arya ;
    Mashal, Mustafa
    2020-05-01 | PDF
    Accelerated Bridge Construction (ABC) technologies are being adopted by the state departments of transportation. ABC increases public’s and worker’s safety by lowering exposure to construction activities and also increases mobility and economic opportunities by reducing traffic interruptions and delays. As an alternative to Ultra-High Performance C ...
  • Increasing Work Zone Safety Worker Behavioral Analysis With Integration of Wearable Sensors and Virtual Reality
    Increasing Work Zone Safety: Worker Behavioral Analysis With Integration of Wearable Sensors and Virtual Reality
    Ergan, Semiha ;
    Ozbay, Kaan
    2020-05-01 | PDF
    With the development of wearable technologies, an increasing number of research studies have been exploring the feasibility of using wearable sensors to send alarms to construction workers. The advancement of virtual reality (VR) enabled researchers to simulate potentially dangerous situations (e.g., speeding vehicles) in work zones without putting ...
  • Formalizing Human Machine Communication in the Context of Autonomous Vehicles
    Formalizing Human Machine Communication in the Context of Autonomous Vehicles
    Gopalswamy, Swaminathan ;
    Saripalli, Srikanth
    2020-05-01 | PDF
    There are many situations where tacit communication between drivers and pedestrians governs and enhances safety. The goal of this study was to formalize this communication and apply it to the driving strategy of an autonomous vehicle. Toward this, we performed a field study of the interaction between drivers and pedestrians. Vehicles were instrumen ...
  • Alternative Methods for Deicing
    Alternative Methods for Deicing
    Fay, Laura ;
    Clouser, Karalyn
    2020-05-01 | PDF
    The goal of this project was to aid winter maintenance managers in better understanding the performance and impacts of alternative methods for deicing, which may be non-chloride based deicers, blends of deicing products, or methods that reduce the number of applications or application rates of deicers. To achieve this, a literature review, survey, ...
  • Assessment of Safety Benefits of Technologies to Reduce Pedestrian Crossing Fatalities at Midblock Locations
    Assessment of Safety Benefits of Technologies to Reduce Pedestrian Crossing Fatalities at Midblock Locations
    Ogle, Jennifer H ;
    Islam, Sababa
    2020-05-01 | PDF
    In 2015, South Carolina ranked third in the nation in pedestrian fatalities per 100,000 population. Out of 979 total motor vehicle fatalities, 123 involved pedestrians, accounting for over 12% of all road user fatalities in South Carolina. While some individuals make conscious choices to walk and dwell in transit-oriented or mixed-use walkable comm ...
  • Asphalt Mix Rejuvenators Synthesis
    Asphalt Mix Rejuvenators Synthesis
    Blanchette, Andrea ;
    Lee, Sheue Torng
    2020-05-01 | PDF
    In recent years, the asphalt industry has seen an increase in using reclaimed asphalt pavements (RAP) and recycled asphalt shingles (RAS) in new asphalt concrete pavements. Rejuvenating additives are incorporated into asphalt mixes to neutralize the effects of using higher percentages of RAP and RAS in new asphalt concrete pavements. The implementa ...
  • Sinkhole Detection With 3D Full Elastic Seismic Waveform Tomography
    Sinkhole Detection With 3-D Full Elastic Seismic Waveform Tomography
    Mirzanejad, Majid ;
    Tran, Khiem T.
    2020-05-01 | PDF
    A new 3-D full waveform inversion (FWI) method was developed, optimized, and verified using synthetic and field test data. The goal was to overcome some of the limitations of a previously developed 2-D approach. Particularly, it was expected that the 3-D FWI method could detect out-of-line voids and 3-D features (pinnacles, zones, etc.), be easier ...
  • Assessing Alternate Approaches for Conveying Automated Vehicle Intentions
    Assessing Alternate Approaches for Conveying Automated Vehicle ‘Intentions’
    Basantis, Alexis ;
    Miller, Marty
    2020-05-01 | PDF
    One of the biggest highly automated vehicle (HAV) market barriers may be a lack of user trust in the automated driving system itself. Research has shown that this lack of faith in the system primarily stems from a lack of system transparency while the vehicle is in motion—users are not informed how the car will react in an upcoming scenario—and not ...
  • Developing Secure Strategies for Vehicular Ad hoc Networks in Connected and Autonomous Vehicles
    Developing Secure Strategies for Vehicular Ad hoc Networks in Connected and Autonomous Vehicles
    Zhu, Quanyan ;
    Zimmerman, Rae
    2020-05-01 | PDF
    The research aims at developing a resilient framework to be applied to transportation systems using connected and autonomous vehicles (CAVs). This innovation potentially responds to accident rates often related to inefficient communication systems, supported by a variety of state-of-the-art safety applications. A Vehicular Ad hoc Network (VANET) is ...
  • Analysis of Electric Bus Deployments at Transit Agencies
    Analysis of Electric Bus Deployments at Transit Agencies
    Gick, Brittney N ;
    Overman, John H
    2020-05-01 | PDF
    Transit agencies across the country are turning to zero-emission electric buses at a much faster rate than school districts. This technical memorandum summarizes transit agency experiences with the purchase, operation, and support of electric buses. These experiences can help identify potential concerns for school districts planning for the use of ...
  • What Makes Cents How Uber Shapes Municipal OnStreet Parking Revenue
    What Makes Cents? How Uber Shapes Municipal On-Street Parking Revenue
    Brown, Anne ;
    Clark, Benjamin Y
    2020-05-01 | PDF
    Autonomous vehicles (AVs) will challenge cities in many ways that are critical to address before widescale adoption. In particular, AVs may upset municipal budgets as they upend traditional auto-related funding streams like registration fees and parking revenues. This research begins to quantify the potential financial impacts of AVs by analyzing c ...
  • Evaluation of Bus Redesign Alternatives in Transit Deserts under RideHail Presence
    Evaluation of Bus Redesign Alternatives in Transit Deserts under Ride-Hail Presence
    Chow, Joseph Y J ;
    Ma, Ziyi
    2020-05-01 | PDF
    Despite the emergence of many new mobility options in cities around the world, fixed route transit is still the most efficient means of mass transport. Transit efficiency, however, is well known to be interdependent with ridership demand and network design. As a result of this interdependency, bus operations are subject to vicious and virtuous cycl ...
  • The Influence of Unmanned Aerial Systems on Driving Performance
    The Influence of Unmanned Aerial Systems on Driving Performance
    University of Wisconsin--Madison
    2020-05-01 | PDF
    Unmanned aerial systems (UAS), or drones, have become increasingly utilized for a myriad of applications in the vicinity of the roadway and can offer a low-cost alternative to many labor-intensive data collection techniques, including infrastructure inspection, roadway marking data collection, and more. To collect much of this data with a desired d ...
  • Installation and Maintenance of Raised Pavement Markers at State Transportation Agencies Synthesis of Current Practices
    Installation and Maintenance of Raised Pavement Markers at State Transportation Agencies: Synthesis of Current Practices
    Zamenian, Hamed ;
    Abraham, Dulcy M.
    2020-05-01 | PDF
    Although raised pavement markers (RPMs) have been widely applied by the Indiana Department of Transportation (INDOT), there have been multiple cases where snowplowing activities have damaged pavements as well as the raised pavement markers on INDOT’s roadway assets. Dislodged raised pavement markers could reduce the design life of pavements because ...
  • Literature Review and Industry Scan of Electric School Buses
    Literature Review and Industry Scan of Electric School Buses
    Gick, Brittney N ;
    Overman, John H
    2020-05-01 | PDF
    The Texas Department of Transportation (TxDOT) tasked the Texas A&M Transportation Institute (TTI) with conducting this literature review and industry scan of electric school buses to proactively assist school districts in their efforts toward researching and/or implementing electric school bus use. The memo begins with an overview of the current f ...
  • Impact of Heavy Trucks and Permitted Overweight Loads on Highways and Bridges Now and in the Future Versus Permit Fees Truck Registration Fees and Fuel Taxes
    Impact of Heavy Trucks and Permitted Overweight Loads on Highways and Bridges Now and in the Future Versus Permit Fees, Truck Registration Fees, and Fuel Taxes
    Ali, Hesham ;
    Nowak, Andrzej S.
    2020-05-01 | PDF
    In this study, a damage assessment approach was developed to calculate the monetary consumption caused by overweight permitted vehicles on bridges and pavements in Florida. The damage assessment analysis for the bridges was conducted based on the fatigue damage measured by the equivalent bending moment on a representative bridge in Florida. Results ...
  • Concrete Pavement Restoration CPR for Bonded Concrete Overlay of Asphalt BCOA Synthesis
    Concrete Pavement Restoration (CPR) for Bonded Concrete Overlay of Asphalt (BCOA) Synthesis
    Blanchette, Andrea ;
    Lee, Sheue Torng
    2020-05-01 | PDF
    Bonded concrete overlay of asphalt (BCOA) pavements, also known as whitetopping, can help enhance the structural capacity and rideability of existing asphalt pavement. In this report, the generic term “BCOA” is used to describe all overlays that are between 3-inchesand 7-inches thick and placed on an asphalt layer a minimum of 3-inches thick. BCOA ...
  • South Carolina Unit Hydrograph Method Applications Manual Users Manual
    South Carolina Unit Hydrograph Method Applications Manual User’s Manual
    Meadows, Michael E.
    2020-05-01 | PDF
    This manual presents and illustrates the South Carolina Synthetic Unit Hydrograph Method (identified as the “SC UH Method”). A key parameter is peak rate factor (PRF) that relates to UH shape and proportion of runoff volume under the rising limb. PRF varies among watersheds and land use. A table with land use specific PRF values recommended for use ...
  • Seismic Retrofits of Reinforced Concrete Columns Using Titanium Alloy Bars
    Seismic Retrofits of Reinforced Concrete Columns Using Titanium Alloy Bars
    Higgins, Christopher ;
    Barbosa, Andre
    2020-05-01 | PDF
    To explore their potential for seismic retrofitting of seismically deficient RC columns using titanium alloy bars (TiABs), experimental tests were undertaken in the laboratory using full-scale specimens. The specimens were designed to have vintage details and proportions that are widely recognized as being seismically deficient. Some specimens were ...
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