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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 1821 - 1840 of 36104 results
  • Evaluating Wildlife Use of the South Jackson Project Highway Crossing Structures Project Phase I
    Evaluating Wildlife Use of the South Jackson Project Highway Crossing Structures: Project Phase I
    Specht, Hannah ;
    Millspaugh, Joshua J
    2023-08-01 | PDF
    Roadways have the potential to negatively impact wildlife populations directly through vehicle collision mortality and indirectly through habitat fragmentation. The Wyoming Department of Transportation installed wildlife crossing structures and wildlife on US 89 between along a 3.6 mile stretch between Jackson and Hoback Junction to mitigate these ...
  • CrowdsourcingWinter Operations Dashboard Upgrade
    Crowdsourcing/Winter Operations Dashboard Upgrade
    Mahlberg, Justin ;
    Desai, Jairaj
    2023-08-01 | PDF
    INDOT has recently completed the deployment of Parsons telematics-based dash-cameras, automatic vehicle locator (AVL) positions, and spreader rate monitoring across their winter operations fleet. The motivation of this study was to develop dashboards that integrate connected vehicle data into the real-time monitoring and after-action review of wint ...
  • Impacts of Hydraulic Modeling Methods on Bridge Scour Analysis
    Impacts of Hydraulic Modeling Methods on Bridge Scour Analysis
    Cox, Amanda L. ;
    Luna, Ronaldo
    2023-08-01 | PDF
    This study has three primary purposes: 1) to investigate the impacts of hydraulic modeling methods on bridge scour analysis, 2) to develop recommendations for sediment/soil sampling methods, and 3) to conduct bridge scour risk assessments. Field data were collected at five study sites to obtain the required terrain and soil/sediment input data for ...
    Supporting Files
  • Increase the Allowable Content of Recycled Crushed Concrete Aggregate in Class P Concrete
    Increase the Allowable Content of Recycled Crushed Concrete Aggregate in Class P Concrete
    Drimalas, Thanos ;
    Lute, Racheal D
    2023-08-01 | PDF
    Over 140 million tons of recycled concrete aggregate (RCA) are produced in the United States per year (ACPA, 2009), and this material has been used in a host of transportation infrastructure applications, including fills, embankments, bases, subbases, and concrete pavements. Currently, TxDOT limits the maximum amount of recycled crushed concrete fi ...
  • WSDOT Maintenance Performance Measure Algorithms
    WSDOT Maintenance Performance Measure Algorithms
    Shrestha, Kishor
    ORCID ICON IMG
    2023-08-01 | PDF
    This research project focuses on deteriorating roadway asset conditions, emphasizing the challenges encountered by the roadway maintenance division of the Washington State Department of Transportation (WSDOT). The project goal is to develop algorithms for prediction models that will forecast the levels of service (LOS) performance conditions of six ...
  • TRACtion Transformative Transportation Working Groups Synthesis
    TRACtion: Transformative Transportation Working Groups Synthesis
    University of California, Los Angeles. Institute of Transportation Studies
    2023-08-01 | PDF
    TRACtion: Transformative Research and Collaboration is a new approach to community–researcher collaboration that seeks to match the University’s academic expertise with the wisdom and perspectives of community groups and advocacy organizations. It is a partnership between the Sustainable LA Grand Challenge (SLAGC) and UCLA Institute of Transportati ...
  • Study of Operational and Safety Impacts of Disabled and Abandoned Vehicles on FDOT Roadways Summary
    Study of Operational and Safety Impacts of Disabled and Abandoned Vehicles on FDOT Roadways [Summary]
    Gordin, Eric ;
    Al-Deek, Haitham
    2023-08-01 | PDF
    A primary goal of the Florida Department of Transportation (FDOT) is to keep vehicles moving safely. But what are the safety impacts of vehicles that are not moving – particularly disabled and abandoned vehicles (DAVs)? From 2015-2020, DAVs were involved in 1,250 crashes in Florida, resulting in 53 fatalities, 976 injuries, $17.3 million in propert ...
  • Traffic Control Device Analysis Testing and Evaluation Program FY2021 Activities
    Traffic Control Device Analysis, Testing, and Evaluation Program: FY2021 Activities
    Finley, Melisa D. ;
    Theiss, LuAnn
    2023-08-01 | PDF
    Traffic control devices are a primary means of communicating highway information to road users. The design, application, and maintenance of traffic control devices are under constant transformation as new technologies, methodologies, and policies are introduced. This project provides the Texas Department of Transportation with a mechanism to conduc ...
  • Advanced Subsurface Investigations Beyond the Borehole with Passive Seismic HorizontaltoVertical Spectral Ratio and Electromagnetic Geophysical Methods at Transportation Infrastructure Sites in New Hampshire
    Advanced Subsurface Investigations Beyond the Borehole with Passive Seismic Horizontal-to-Vertical Spectral Ratio and Electromagnetic Geophysical Methods at Transportation Infrastructure Sites in New Hampshire
    Degnan, James R ;
    Welch, Sydney
    2023-08-01 | PDF
    Geotechnical site characterization sometimes fails to fully characterize the below-ground bedrock surface and hydrologic conditions using conventional borings. By combining geophysical and boring data analysis, transportation projects can produce a more thorough and accurate representation of geotechnical subsurface conditions, reducing the disrupt ...
  • Assessing Ohios Detour Determination Reporting for Process Improvements ORIL ROC 2021ORIL6 Task 5
    Assessing Ohio’s Detour Determination Reporting for Process Improvements [ORIL ROC 2021-ORIL6 Task #5]
    Naik, Bhaven ;
    Eustace, Deogratias
    2023-08-01 | PDF
    Ohio’s local public agencies (County Engineers, Township Trustees, Villages and Municipalities) often experience the burden of construction traffic when the Ohio DOT (ODOT) closes a state route for construction. ODOT typically provides the locals with a Detour Determination Report (DDR) that evaluates the length of a detour, duration of closure and ...
  • Improved California Truck Traffic Census Reporting and Spatial Activity Measurement
    Improved California Truck Traffic Census Reporting and Spatial Activity Measurement
    Ritchie, Stephen G. ;
    Tok, Andre
    2023-08-01 | PDF
    The Federal Highway Administration (FHWA) vehicle classification scheme is designed to serve various transportation operational and planning needs. Many transportation agencies rely on Weigh-In-Motion and automatic vehicle classification sites to collect vehicle classification count data. However, these systems are not widely deployed due to high i ...
  • Development of Potential Strategies for Unmarked and Low Traffic Volume Roadways in Illinois
    Development of Potential Strategies for Unmarked and Low Traffic Volume Roadways in Illinois
    Rajagopal, Arudi (Raj) ;
    Mercurio, John
    2023-08-01 | PDF
    The present study was initiated by the Illinois Department of Transportation (IDOT) to better understand characteristics of roadway segments categorized as unmarked in IDOT’s Transportation Asset Management Plan and to suggest recommendations to manage, vacate, abandon, retain, or transfer individual routes. The researchers developed a methodology, ...
  • The Effects of Highway Improvement Projects on Nearby Business Activity
    The Effects of Highway Improvement Projects on Nearby Business Activity
    Wexler, Noah ;
    Fan, Yingling
    2023-08-01 | PDF
    This report analyzes how state-funded highway improvement projects in the seven county Twin Cities metropolitan area affected businesses in adjacent Census Tracts. We first identify demographic factors associated with the temporal and financial prioritization of some projects over others, finding that the per capita income of a Census Tract is asso ...
  • District Highway Maintenance Research OnCall ROC Task3 ODOT Maintenance Workflow Fact Sheet
    District Highway Maintenance Research On-Call (ROC) –Task#3 ODOT Maintenance Workflow [Fact Sheet]
    Schroeder, Bastian ;
    Rowe, Glenn
    2023-08-01 | PDF
    This project investigated Ohio DOT’s (ODOT) existing workflow and needs for scheduling maintenance activities. ODOT conducts biweekly inspections and records roadway defects using ArcGIS Field Maps. Sources of maintenance work items also include periodic maintenance work, other collector apps for different asset types (i.e., culverts) and phone cal ...
  • Evaluation of Allowable Taper Rates of Freestanding SingleSlope Concrete Barriers
    Evaluation of Allowable Taper Rates of Freestanding Single-Slope Concrete Barriers
    Bligh, Roger P. ;
    Cakalli, Sofokli
    2023-08-01 | PDF
    The Texas Department of Transportation desires to flare the ends of its freestanding single-slope concrete barrier system so the system can be terminated outside the clear zone. Currently, limited guidance exists on the acceptable flare rate for the single-slope portable concrete barrier under the American Association of State Highway and Transport ...
  • Evaluation of Attachments to Concrete Barrier Systems to Deter PedestriansVolume 1 Technical Report
    Evaluation of Attachments to Concrete Barrier Systems to Deter Pedestrians—Volume 1: Technical Report
    Silvestri-Dobrovolny, Chiara ;
    Bligh, Roger
    2023-08-01 | PDF
    Concrete rigid barriers are used in medians to separate traffic and on the roadside to shield hazards from motorists and motorists from hazards. These barriers need to demonstrate crashworthiness through full-scale testing per the American Association of State Highway and Transportation Officials Manual for Assessing Safety Hardware (MASH). Attachm ...
  • Improving Safety Service Patrol Performance
    Improving Safety Service Patrol Performance
    Cetin, Mecit ;
    Yang, Hong
    2023-08-01 | PDF
    Safety Service Patrols (SSPs) provide motorists with assistance free of charge on most freeways and some key primary roads in Virginia. This research project is focused on developing a tool to help the Virginia Department of Transportation (VDOT) optimize SSP routes and schedules (hereafter called SSP-OPT). The computational tool, SSP-OPT, takes re ...
  • Maximizing Equity in Managed Lane Planning Technical Summary
    Maximizing Equity in Managed Lane Planning [Technical Summary]
    Larsen, Bradley ;
    Lari, Adeel Z.
    2023-08-01 | PDF
    Managed lanes provide transportation agencies with a strategy for reducing congestion and improving travel times along urban highways. These designated lanes, known as E-ZPass lanes in Minnesota, are available to carpoolers and transit users for free during high-traffic times, while vehicle owners who are driving alone pay a fee.
  • New Hampshire Department of Transportation Development of an Unmanned Aircraft Systems UAS Program
    New Hampshire Department of Transportation – Development of an Unmanned Aircraft Systems (UAS) Program
    WSP USA Inc.
    2023-08-01 | PDF
    Unmanned Aircraft Systems (UAS) are being used nationwide in an effort to improve safety, increase efficiency, increase quality, and reduce costs. A previous New Hampshire Department of Transportation (NHDOT) research project tested UAS technology to ascertain the ability to assist NHDOT with operations, development, and the execution of transporta ...
  • Incorporating the Site Variability and Laboratory InSitu Testing Variability of Soil Properties in Geotechnical Engineering Design Tech Summary
    Incorporating the Site Variability and Laboratory/ In-Situ Testing Variability of Soil Properties in Geotechnical Engineering Design [Tech Summary]
    Abu-Farsakh, Murad ;
    Zhang, Zhongjie “Doc”
    2023-08-01 | PDF
    The main objective of this research is to: Evaluate the operator-induced and equipment-induced variations on design soil properties; Evaluate the site spatial variations of design soil properties; Evaluate the best spatial interpolation method to generate synthetic CPT profiles and soil boring data from the existing CPT and soil boring data of the ...
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