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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 2181 - 2200 of 36873 results
  • Design of Stormwater BMPs for Surface and Groundwater Protection Based on SiteScale Soil Properties Phase I
    Design of Stormwater BMPs for Surface and Groundwater Protection Based on Site-Scale Soil Properties: Phase I
    Kibler, Kelly M. ;
    Chambers, Lisa
    2023-08-01 | PDF
    Phase I of this research developed experimental methodologies to quantify and compare the rates and means of nitrogen and phosphorus transformations through diverse soil profiles. Six sites were selected for study from areas of distinct geologic history in Florida. Soils from the six sites were chosen to represent a gradient of clay and organic mat ...
  • Rural Intersections within Passing Lanes
    Rural Intersections within Passing Lanes
    Fitzpatrick, Kay ;
    Brewer, Marcus A.
    2023-08-01 | PDF
    Super 2 highways are used across Texas to provide passing opportunities and increase capacity on rural two-lane roads, but passing lanes are a treatment for through vehicles and do not address the needs of turning vehicles. This project investigated the operational and safety benefits of turning treatments on two-lane and Super 2 corridors, as well ...
  • Strategies to Preserve Transitaccessible Affordable Housing in Southern California
    Strategies to Preserve Transit-accessible Affordable Housing in Southern California
    Parker, Madeleine E.G ;
    Chapple, Karen
    2023-08-01 | PDF
    This report highlights risk and prioritization factors for housing developments with expiring affordability protections, focused on preserving transit-accessible affordable housing. It presents a regional framework for identifying and preserving subsidized affordable housing in the Southern California Association of Governments (SCAG) region (Los A ...
  • Implementation of Electrical Resistivity Imaging Manual
    Implementation of Electrical Resistivity Imaging Manual
    Shahandashti, Mohsen ;
    Hossain, Sahadat
    2023-08-01 | PDF
    Texas Department of Transportation (TxDOT) annually encounters a substantial number of claims and change orders that have a detrimental effect on project costs and schedules. State Departments of Transportation (DOTs) spend approximately $10 million annually on geotechnical-related change orders, accounting for about 7% of the total expenditures as ...
  • Traffic Safety Facts Motorcycle Helmet Use in 2022Overall Results
    Traffic Safety Facts: Motorcycle Helmet Use in 2022—Overall Results
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2023-08-01 | PDF
    Use of DOT-compliant motorcycle helmets was 66.5 percent in 2022, not statistically different at the 0.05 level from 64.9 percent in 2021. This result is from the National Occupant Protection Use Survey (NOPUS), the only survey that provides nationwide, probability-based, observed data on motorcycle helmet use in the United States. The 2022 data co ...
  • Developing a Prototype System for Establishing Passing and NoPassing Zones of TwoLane Highways
    Developing a Prototype System for Establishing Passing and No-Passing Zones of Two-Lane Highways
    Farid, Ahmed ;
    Connell, Zephaniah
    2023-08-01 | PDF
    Two-lane highways comprise a considerable percentage of the nation’s roads. A critical component required in the design of two-lane highways is the passing sight distance (PSD). In cases where it is inadequate, no-passing zones are established. There are multiple techniques that are employed for measuring the PSD in the field and the Wyoming Depart ...
  • Smart Connected and Automated Vehicle Fleet Management Developing Regional Dispatch Decision Support for Congestion Mitigation
    Smart Connected and Automated Vehicle Fleet Management: Developing Regional Dispatch Decision Support for Congestion Mitigation
    Cummings, M ;
    Rouphail, Nagui M.
    2023-08-01 | PDF
    With the arrival of new technologies like connected and self-driving autonomous vehicles (AVs), the workload of regional dispatchers will increase. To this end, the CADS (Congestion Alerting Decision Support) tool was developed to support strategic transportation planning (on the order of weeks to months) and tactical transportation planning (on th ...
  • 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 ...
  • 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 ...
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