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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 3621 - 3640 of 36011 results
  • Detecting Pavement Distresses Using Crowdsourced Dashcam Camera Images
    Detecting Pavement Distresses Using Crowdsourced Dashcam Camera Images
    Dadashova, Bahar ;
    Dobrovolny, Chiara Silvestri
    2021-05-01 | PDF
    Pavements play a vital role in the transportation infrastructure in the United States. Damage to public road transportation infrastructure causes roadways to fail to perform as intended and increases crash risks. Road damage must be detected quickly and accurately in order to maintain roads and effectively allocate repair money. In this study, four ...
  • Life Extension of FatigueDamaged Highway Rail and Transit Bridges
    Life Extension of Fatigue-Damaged Highway, Rail, and Transit Bridges
    Tracy, Alexandra ;
    Sause, Richard
    2021-05-01 | PDF
    Fatigue is a common and potentially very damaging occurrence in metallic structures, including steel bridges. There have been numerous studies throughout the last two centuries on fatigue life, but challenges of preventing fatigue crack growth are still unresolved. The most widespread method of repair and retrofitting involves drilling a crack-arre ...
  • The Effectiveness of Organic Matter Amendments in Promoting Hydric Soil Conditions and Overall Health of Mitigation Wetlands Phase II
    The Effectiveness of Organic Matter Amendments in Promoting Hydric Soil Conditions and Overall Health of Mitigation Wetlands – Phase II
    Baldwin, Andrew ;
    Yarwood, Stephanie
    2021-05-01 | PDF
    Organic amendments did not promote hydric soil conditions in wetlands as originally hypothesized. Instead, soil saturation strongly determines if soils are hydric. Hydric soils can be tested using several different methods, and redox electrodes appeared to give more favorable test results than dipyridyl strips in unsaturated conditions. IRIS can al ...
  • Applying an Equity Lens to Automated Payment Solutions for Public Transportation [supporting datasets]
    Golub, Aaron ;
    Brown, Anne
    2021-05-01 | XLSX
    The research team carried out intercept surveys in Portland, Gresham, Eugene and Denver in July, August and September of 2019. In total, 2,303 riders completed intercept surveys across the three regions. Our surveys were designed to take place during short “intercept” interviews between the research staff and the rider, typically at transit station ...
    Dataset Supporting Files
  • Developing Recommendations for Allowable RAP Contents in Idaho Asphalt Mixes
    Developing Recommendations for Allowable RAP Contents in Idaho Asphalt Mixes
    Mishra, Debakanta (Deb)
    ORCID ICON IMG
    2021-05-01 | PDF
    This research study focused on evaluating the effects of high recycled Asphalt Pavement (RAP) contents on asphalt mix performance. Until recently, the Idaho Transportation Department (ITD) did not impose any restriction on the amount of RAP allowed in an asphalt mix. As a result, pavement sections were constructed in Idaho with up to 54 percent RAP ...
  • Rural Transit Fact Book 2021
    Rural Transit Fact Book 2021
    Mattson, Jeremy ;
    Mistry, Dilip
    2021-05-01 | PDF
    Public transportation plays a fundamental role in the livability of communities of all sizes. The Rural Transit Fact Book provides information on transit service availability and cost to help the transit industry in the United States provide efficient and effective service to meet rural community mobility needs. Financial and operating statistics c ...
  • Reference Machine Vision for ADAS Functions
    Reference Machine Vision for ADAS Functions
    Nayak, Abhishek ;
    Rathinam, Sivakumar
    2021-05-01 | PDF
    Studies have shown that fatalities due to unintentional roadway departures can be significantly reduced if Lane Departure Warning and Lane Keep Assist systems are used effectively. However, these systems have not been widely adopted due, in part, to the lack of suitable standards for pavement markings that enable reliable functionality of sensor sy ...
  • Applying an Equity Lens to Automated Payment Solutions for Public Transportation
    Applying an Equity Lens to Automated Payment Solutions for Public Transportation
    Golub, Aaron ;
    Brown, Anne
    2021-05-01 | PDF
    Many transit agencies plan to automate their fare collection and limit the use of cash for payment, with the goals of improving boarding and data collection while lowering operating costs. Still, about 10% of adults in the United States lack a bank account or credit card, and many either rely on restrictive cell-phone data plans or don’t have acces ...
  • Supporting Transportation System Management and Operations Using Internet of Things Technology
    Supporting Transportation System Management and Operations Using Internet of Things Technology
    Yang, Hong ;
    Shen, Yuzhong
    2021-05-01 | PDF
    Low power wide-area network (LPWAN) technology aims to provide long range and low power wireless communication. It can serve as an alternative technology for data transmissions in many application scenarios (e.g., parking monitoring and remote flood sensing). In order to explore its feasibility in transportation systems, this project conducted a re ...
  • Guidance for SeparatedBuffered Bike Lanes With Delineators
    Guidance for Separated/Buffered Bike Lanes With Delineators
    Hourdos, John ;
    Duhn, Melissa
    2021-05-01 | PDF
    Separated bicycle lanes (SBLs) are bicycle facilities that employ both paint and a vertical element as a buffer between vehicle traffic and bicycle traffic. In recent years, the installation of SBLs has increased in the U.S. as planners and engineers seek to reduce crash risk, increase safety and foster demand. In turn, public demand for these faci ...
  • Compaction Testing of Granular Material
    Compaction Testing of Granular Material
    Jones, Allen ;
    Weber, Jason
    2021-05-01 | PDF
    The South Dakota Department of Transportation (SDDOT) has identified a need to reevaluate methods in determining whether granular materials have been compacted to the desired density. Practices of other DOTs indicate additional advantages and disadvantages to various in-situ compaction testing devices. Some DOTs are transitioning to dynamic cone pe ...
  • Evaluating ASCT Operations for Dodge Street Corridor
    Evaluating ASCT Operations for Dodge Street Corridor
    Sharma, Anuj ;
    Poddar, Subhadipto
    2021-05-01 | PDF
    As Adaptive Traffic Control (ATC) is increasingly being implemented by various traffic agencies, careful evaluation is needed of the degree to which a given ATC implementation improves traffic signal performance. The present study details the evaluation of ATC for two arterial corridors in the City of Omaha, Nebraska. Several performance measures w ...
  • Increasing Access Mobility and Shelter Opportunities for Disadvantaged Populations Affordable Housing in TransitOriented Developments
    Increasing Access, Mobility, and Shelter Opportunities for Disadvantaged Populations: Affordable Housing in Transit-Oriented Developments
    Banerjee, Tridib ;
    Garde, Ajay
    2021-05-01 | PDF
    The Southern California region faces an affordable housing crisis. This crisis can be addressed by promoting affordable housing for the disadvantaged in Transit Oriented Developments (TODs). TODs frequently face regulatory and non-regulatory barriers. In this study we identify those barriers to affordable housing and recommend how to redress this p ...
  • Developing an EvidenceBased Framework for Bypass and Widening Projects and the Effects on Communities
    Developing an Evidence-Based Framework for Bypass and Widening Projects and the Effects on Communities
    Hernandez, Sarah ;
    Jebaraj, Mervin
    2021-05-01 | PDF
    This research examines the impacts of highway bypass, widening, and no-improvement projects on the economic and safety conditions of small towns in Arkansas. This research provides evidence-based comparisons of bypass, widening, and no improvement projects in Arkansas that can be used to support the public outreach and community decision making pro ...
  • Utilizing ATSPM Data for Pedestrian Planning and Analysis Phase II Extending Pedestrian Volume Estimation Capabilities to Unsignalized Intersections
    Utilizing ATSPM Data for Pedestrian Planning and Analysis – Phase II: Extending Pedestrian Volume Estimation Capabilities to Unsignalized Intersections
    Singleton, Patrick A. ;
    Park, Keunhyun
    2021-05-01 | PDF
    Direct-demand models of pedestrian volumes (identifying relationships with built environment characteristics) require pedestrian data, typically from short-duration manual counts at a limited number of locations. We overcome these limitations using a novel source of pedestrian data: estimated pedestrian crossing volumes based on push-button event d ...
  • Evaluation of Various Perimeter Barrier Products
    Evaluation of Various Perimeter Barrier Products
    Bhattarai, Rabin ;
    Zhang, Yufan
    2021-05-01 | PDF
    Construction activities entail substantial disturbance of topsoil and vegetative cover. As a result, stormwater runoff and erosion rates are increased significantly. If the soil erosion and subsequently generated sediment are not contained within the site, they would have a negative off-site impact as well as a detrimental influence on the receivin ...
  • Balanced Mix Design for Surface Asphalt Mixtures Phase I Initial Roadmap Development and Specification Verification
    Balanced Mix Design for Surface Asphalt Mixtures: Phase I: Initial Roadmap Development and Specification Verification
    Diefenderfer, Stacey D ;
    Boz, Ilker
    2021-05-01 | PDF
    The Virginia Department of Transportation (VDOT), as with many owner agencies, is interested in ways to facilitate the increased durability of asphalt mixtures in an effort to make its roadway network more sustainable, longer lasting, and more economical. The balanced mix design (BMD) method addresses this through the incorporation of performance c ...
  • Brake Wear Particulate Matter Emissions Modeling
    Brake Wear Particulate Matter Emissions Modeling
    Koupal, John ;
    DenBleyker, Allison
    2021-05-01 | PDF
    California Department of Transportation (Caltrans) is required to use mobile source emission inventory tool known as Emission FACtor (EMFAC) developed by California Air Resources Board (CARB) to estimate and analyze on-road emissions of particulate matter (PM) while other states use the MOVES (Motor Vehicle Emission Simulator) model developed by U. ...
  • Integration of AASHTO Element Inspections Data into NYSDOT Structures Management System and Processes
    Integration of AASHTO Element Inspections Data into NYSDOT Structures Management System and Processes
    Leckrone, Thomas ;
    Thompson, Paul D.
    2021-05-01 | PDF
    The goals of this research project were to develop, evaluate, and recommend changes necessary to integrate the AASHTO element-based inspection system into NYSDOT bridge management decision-making processes, guidelines, and bridge performance measures. The research developed a logic for identifying the work needs for each bridge based chiefly on AAS ...
  • Development of Pavement Performance Models for Pavement Management Incorporating Treatment Type
    Development of Pavement Performance Models for Pavement Management Incorporating Treatment Type
    Xu, Hongbin ;
    Kim, Moo Yeon
    2021-05-01 | PDF
    TxDOT’s Pavement Management Information System (PMIS) has been recently replaced by Pavement Analyst (PA), a system for archiving, managing, and mapping data; reporting performance prediction; conducting optimization analysis for decision-making, etc. Pavement performance models comprise a key component of PA; these models quantify pavement deterio ...
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