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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 3941 - 3960 of 36908 results
  • Combining Crowdsourcing and Machine Learning to Collect Sidewalk Accessibility Data at Scale
    Combining Crowdsourcing and Machine Learning to Collect Sidewalk Accessibility Data at Scale
    Froehlich, Jon E
    ORCID ICON IMG
    2021-06-09 | PDF
    The authors are developing new data collection approaches that use a combination of remote crowdsourcing, machine learning, and online map imagery. Their newest effort, called Project Sidewalk, enables online crowdworkers to remotely label pedestrian-related accessibility problems by virtually walking through city streets in Google Street View. In ...
  • Investigation of Pavement Emulsion Absorption Rates
    Investigation of Pavement Emulsion Absorption Rates
    Castorena, Cassie ;
    Fried, Andrew
    2021-06-07 | PDF
    The Emulsion Application Rate (EAR) is critical to the performance of both tack coats and chip seals. When emulsion is applied to an aged flexible pavement, a portion of the applied emulsion will be absorbed by the existing pavement. To compensate, the current practice is to adjust the required target EAR used in the construction based on visual in ...
  • Fighting for Curb Space Parking RideHailing Urban Freight Deliveries and Other Users
    Fighting for Curb Space: Parking, Ride-Hailing, Urban Freight Deliveries, and Other Users
    Jaller, Miguel ;
    Rodie, Caroline
    2021-06-01 | PDF
    There is a need to optimally allocate curb space-one of the scarcest resources in urban areas-to the different and growing needs of passenger and freight transport. Although there are plenty of linear miles of curbside space in every city, the growing adoption of ride-hailing services and the rise of e-commerce with its residential deliveries, and ...
  • Infrasound Avalanche Monitoring Enhanced Monitoring in Little Cottonwood Canyon Utah
    Infrasound Avalanche Monitoring: Enhanced Monitoring in Little Cottonwood Canyon, Utah
    Johnson, Jeffrey B ;
    Marshall, Hans-Peter
    2021-06-01 | PDF
    The work is a continuation of a 2017-2018 TARP project, which focused on testing infrasound sensor technology and deployment optimization of infrasound stations for monitoring of snow avalanches in Little Cottonwood Canyon (LCC), Utah. The goals of this project were to develop software and hardware solutions to permit (cell) telemetry of synthesize ...
  • Rock Cut Blasting Aesthetics Best Management Practices Phase II
    Rock Cut Blasting Aesthetics Best Management Practices Phase II
    Allen, Thomas J. ;
    Andrew, Richard
    2021-06-01 | PDF
    Rock excavations are necessary for construction of highways in transportation corridors that pass through Colorado’s mountains. Scenery along these corridors is an asset worthy of preservation and rock slope excavations can negatively impact the visual appeal of the natural landscape. The visual impacts from rock excavations can be mitigated by use ...
  • Development and MASH TL4 Evaluation of TxDOT LargeScupper Median Barrier for FloodProne Areas
    Development and MASH TL-4 Evaluation of TxDOT Large-Scupper Median Barrier for Flood-Prone Areas
    Dobrovolny, Chiara Silvestri ;
    Kovar, James C.
    2021-06-01 | PDF
    Concrete median barriers are designed to mitigate serious cross-median crashes by preventing penetration of errant vehicles into oncoming traffic. When implemented in flood-prone areas, however, solid concrete median barriers can act as a dam to floodwaters, as recently seen in Texas during Hurricane Harvey or in Louisiana and Pennsylvania followin ...
  • Researching Relationships Between Truck Travel Time Performance Measures and OnNetwork and OffNetwork Characteristics
    Researching Relationships Between Truck Travel Time Performance Measures and On-Network and Off-Network Characteristics
    Duvvuri, Sarvani ;
    Pulugurtha, Srinivas S.
    2021-06-01 | PDF
    Trucks serve significant amount of freight tonnage and are more susceptible to complex interactions with other vehicles in a traffic stream. While traffic congestion continues to be a significant ‘highway’ problem, delays in truck travel result in loss of revenue to the trucking companies. There is a significant research on the traffic congestion m ...
  • Emissions Impact of Connected and Automated Vehicle Deployment in California
    Emissions Impact of Connected and Automated Vehicle Deployment in California
    Circella, Giovanni ;
    Jaller, Miguel
    2021-06-01 | PDF
    This study helps understand how the anticipated emergence of autonomous vehicles will affect various aspects of society and transportation, including travel demand, vehicle miles traveled, energy consumption, and emissions of greenhouse gases and other pollutants. The study begins with a literature review on connected and automated vehicle (CAV) te ...
  • Texas Perpetual Pavement Design and Construction Guidelines
    Texas Perpetual Pavement Design and Construction Guidelines
    Lee, Sang Ick ;
    Hu, Sheng
    2021-06-01 | PDF
    Since 2001, Texas has designed and constructed perpetual pavements on heavily trafficked highways. The perpetual pavement takes into account the increased structural demands due to heavy truck traffic, where cumulative one-direction traffic loading of more than 30 million 18-kip equivalent single axle loads (ESALs) over a 20–30 year design life is ...
  • Bonding and Sealing Treatments for Asphalt Overlays
    Bonding and Sealing Treatments for Asphalt Overlays
    Wilson, Bryan ;
    Sakhaeifar, Maryam
    2021-06-01 | PDF
    Bonding and sealing treatments for asphalt overlays: PowerPoint presentation.
  • Development of Iowa Pavement Analysis Techniques IPAT Summary
    Development of Iowa Pavement Analysis Techniques (IPAT) [Summary]
    Ceylan, Halil ;
    Kim, Sunghwan
    2021-06-01 | PDF
    This study developed a user-friendly pavement performance and remaining service life prediction tool that local agencies can use to help make better informed performance-based pavement infrastructure planning decisions by prioritizing preservation and rehabilitation needs for their pavement assets.
  • Assessment of Innovative and Automated Freight Strategies and Technologies Phase II Final Report
    Assessment of Innovative and Automated Freight Strategies and Technologies – Phase II Final Report
    Morgan, Curtis A. ;
    Borowiec, Jeffrey D.
    2021-06-01 | PDF
    Phase II of TxDOT 0-6837 investigated nine strategy/technology (S/T) areas recommended by the Texas Department of Transportation (TxDOT) at the end of Phase I. Researchers used the National Cooperative Highway Research Program (NCHRP) 750: Volume 3 Systematic Technology Reconnaissance, Evaluation, and Adoption Methodology (STREAM) evaluation method ...
  • ReRounding of Deflected Thermoplastic Conduit Phase 2
    Re-Rounding of Deflected Thermoplastic Conduit, Phase 2
    Sargand, Shad ;
    Khoury, Issam
    2021-06-01 | PDF
    Re-rounding is a technique for remediating excess deflection in a thermoplastic pipe using a pneumatic device vibrating along the vertical axis and pushing against the inside crown and invert to restore the original pipe shape and redistribute the surrounding backfill. Since the process has not been evaluated on HDPE pipe outside a couple older rep ...
  • Fourteen Pathways between Urban Transportation and Health A Conceptual Model Literature Review and Burden of Disease Assessment
    Fourteen Pathways between Urban Transportation and Health: A Conceptual Model, Literature Review, and Burden of Disease Assessment
    Khreis, Haneen ;
    Sohrabi, Soheil
    2021-06-01 | PDF
    Transportation has been linked to several adverse health impacts, with a large, but modifiable, burden of disease. In this work, researchers conceptualized and documented the linkages between transportation and health. Following that, the researchers quantified the impacts of transportation on health in a case study in Houston, Texas, that focused ...
  • Roadway Lightings Effect on Pedestrian Safety at Intersection and Midblock Crosswalks
    Roadway Lighting’s Effect on Pedestrian Safety at Intersection and Midblock Crosswalks
    Bhagavathula, Rajaram ;
    Gibbons, Ronald
    2021-06-01 | PDF
    Soils containing inorganic compounds are frequently encountered by transportation agencies during construction within the right-of-way, and they pose a threat to human health and the environment. As a result, construction activities may experience project delays and increased costs associated with management of inorganic compounds containing soils ...
  • Longitudinal Analyses of Washington State Student Travel Surveys
    Longitudinal Analyses of Washington State Student Travel Surveys
    Moudon, Anne Vernez ;
    Shi, Xiao
    2021-06-01 | PDF
    Part of a long-term collaboration between the University of Washington (UW) and Washington State Department of Transportation (WSDOT), this project contained two studies: (1) longitudinal changes in active school transport (AST) rates and (2) impacts of Safe Routes to School (SRTS) projects on AST rates. (1) The average rate of AST for the 241 scho ...
  • Application of Different Negative Binomial Parameterizations To Develop Safety Performance Functions for NonFederal Aid System Roads
    Application of Different Negative Binomial Parameterizations To Develop Safety Performance Functions for Non-Federal Aid System Roads
    Khodadadi, Ali ;
    Tsapakis, Ioannis
    2021-06-01 | PDF
    Safety performance functions (SPFs) are the main building blocks in understanding the relationships between crash risk factors and crash frequencies. Many research efforts have focused on high-volume roadways that typically experience more crashes. A few studies have documented SPFs for non-federal aid system (NFAS) roads including rural minor coll ...
  • Evaluation of Chemical Solutions to Concrete Durability Problems
    Evaluation of Chemical Solutions to Concrete Durability Problems
    Fong-Martinez, Bruno ;
    Wheeless, Jeremy
    2021-06-01 | PDF
    The reinforced concrete infrastructure in Texas has been plagued by various durability-related issues over the years, including deterioration from alkali-silica reaction (ASR), delayed ettringite formation (DEF), and corrosion of reinforcing steel. For many of these durability problems, fly ash has been the remedy of choice; however, with changes i ...
  • Division of Construction Research OnCall Services 20202023 Task 1 Detection of Segregation in Asphalt Concrete Pavement
    Division of Construction Research On-Call Services 2020–2023 Task 1: Detection of Segregation in Asphalt Concrete Pavement
    Sargand, Shad ;
    Russ, Andrew
    2021-06-01 | PDF
    Segregation in asphalt pavement can manifest either as variation in the gradation of the aggregate in the asphalt mix (gradation segregation) or as variation in the temperature (thermal segregation), and both may occur together. Perhaps the primary cause of segregation is improper handling during mixing, transportation, and placement of the asphalt ...
  • Develop Refine and Validate a Survey to Assess Adults Perspectives of Autonomous RideSharing Services
    Develop, Refine, and Validate a Survey to Assess Adult's Perspectives of Autonomous Ride-Sharing Services
    Classen, Sherrilene ;
    Mason, Justin
    2021-06-01 | PDF
    Autonomous vehicles (AVs) have generated great excitement for the future of transportation. Not only are self-driving cars already being piloted, but there is also significant interest and investment in shared automated transportation services by companies such as Uber, Lyft, and Voyage (Isaac, 2017). Despite the excitement, there is much uncertain ...
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