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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 4061 - 4080 of 36908 results
  • 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 ...
  • Evaluating the Private Sector Returns to Transportation Investments in Tennessee
    Evaluating the Private Sector Returns to Transportation Investments in Tennessee
    Murray, Matthew N. ;
    Welch, Jilleah G.
    2021-05-01 | PDF
    This report explores the way in which TDOT investments in state roads and interstate highways affect economic growth in Tennessee counties as measured by nonfarm employment, business establishments, personal income, per capita personal income and population. The goal is to estimate the private sector economic returns to public sector transportation ...
  • The Impacts and Adoption of Connected and Automated Vehicles in Tennessee
    The Impacts and Adoption of Connected and Automated Vehicles in Tennessee
    Mishra, Sabyasachee ;
    Golias, Mihalis M.
    2021-05-01 | PDF
    Connected and autonomous vehicles (CAVs) can revolutionize the daily travel modes, personal, public, or shared mobility because of technology-assisted driving. However, such a revolution will come at the cost of numerous anticipated barriers like accident liabilities, data safety concerns, the addition of new infrastructure, and increased emissions ...
  • Concepts of Operations for Autonomous Vehicle Dispatch Operations
    Concepts of Operations for Autonomous Vehicle Dispatch Operations
    Cummings, Mary ;
    Li, Songpo
    2021-05-01 | PDF
    The future of surface transportation will likely include fleets of autonomous vehicles (AVs), both passenger and freight. Such futuristic operations will require remote monitoring of individual and fleets of AVs through an operations center staffed by personnel that resemble present-day surface transportation dispatchers. This report outlines three ...
  • Evaluate Ohio Department of Transportations Ability To Decrease Dump Truck Backing Accidents Phase 2
    Evaluate Ohio Department of Transportation’s Ability To Decrease Dump Truck Backing Accidents (Phase 2)
    Wei, Heng ;
    Zhou, Frank Xuefu
    2021-05-01 | PDF
    As a result of the Phase 1 project, “Improper Backing” and “Inattention while Backing” are identified as two major causes of truck backing accidents. The comprehensive literature indicates that the probability of accidents occurring is about 70% in the rear area of a dump truck and about 20% in the right area. To that end, the overall goal of this ...
  • Building a GIS Workshop for High School Students
    Building a GIS Workshop for High School Students
    Orr, Meghan ;
    Olson, Ben
    2021-05-01 | PDF
    Geographic information systems are an increasingly relevant tool being used in a variety of workforces. While education on GIS is well developed at the collegiate level and in workforce training programs, it is underutilized in K-12 settings. Research indicates that learning GIS can improve spatial and critical thinking skills in students, key elem ...
  • Synthesis Study of Best Practices for Mapping and Coordinating Detours for Maintenance of Traffic MOT and Risk Assessment for Duration of Traffic Control Activities
    Synthesis Study of Best Practices for Mapping and Coordinating Detours for Maintenance of Traffic (MOT) and Risk Assessment for Duration of Traffic Control Activities
    Mwamba, Isaiah C ;
    Morshedi, Mohamadali
    2021-05-01 | PDF
    Maintenance of traffic (MOT) during construction periods is critical to the success of project delivery and the overall mission of transportation agencies. MOT plans may include full road closures and coordination of detours near construction areas. Various state DOTs have designed their own manuals for detour mapping and coordination. However, ver ...
  • Analysis Modeling and Simulation AMS Case Studies of Connected and Automated Vehicle CAV Implementations Specific to the South Central Region
    Analysis, Modeling, and Simulation (AMS) Case Studies of Connected and Automated Vehicle (CAV) Implementations Specific to the South Central Region
    Melson, Christopher ;
    Ma, Jiaqi
    2021-05-01 | PDF
    Connected and automated vehicles (CAVs) offer potentially transformative and far-reaching impacts to the transportation system. However, realized benefits will be directly tied to how well agencies prepare for these technologies. This report documents efforts that support CAV preparatory actions in Louisiana and includes: (1) conducting a stakehold ...
  • Detection and Classification of Concrete Patches by Integrating GPR and Surface Imaging
    Detection and Classification of Concrete Patches by Integrating GPR and Surface Imaging
    Cheng, Peng ;
    Krogmeier, James V.
    2021-05-01 | PDF
    This research considers the detection, location, and classification of patches in concrete and asphalt-on-concrete pavements using data taken from ground penetrating radar (GPR) and the WayLink 3D Imaging System. In particular, the project seeks to develop a patching table for “inverted-T” patches. A number of deep neural net methods were investiga ...
  • Americas Marine Highway Route Designations
    America’s Marine Highway Route Designations
    United States. Department of Transportation. Maritime Administration
    2021-05-01 | PDF
    The Marine Highway system currently includes 26 "Marine Highway Routes" that serve as extensions of the surface transportation system. Each all-water route is designated by the Secretary and offers relief to landside corridors suffering from traffic congestion, excessive air emissions or other environmental challenges.
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