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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 1961 - 1980 of 36114 results
  • Balanced Mix Design for Surface Mixtures 2021 and 2022 Plant Mix Schedule Pilots
    Balanced Mix Design for Surface Mixtures: 2021 and 2022 Plant Mix Schedule Pilots
    Diefenderfer, Stacey D ;
    Boz, Ilker
    2023-06-01 | PDF
    Many state highway agencies are currently exploring a new approach for designing and accepting asphalt mixtures, known as the balanced mix design (BMD) method (hereinafter “BMD”). The Virginia Department of Transportation (VDOT) has made a commitment to adopt BMD to enhance the performance of asphalt mixtures. Since 2018, VDOT has taken incremental ...
  • Centerline Rumble Strip Effects on Pavement Performance
    Centerline Rumble Strip Effects on Pavement Performance
    Coleri, Erdem ;
    Chitnis, Vipul
    2023-06-01 | PDF
    Despite numerous research studies inspecting the safety benefits of CLRS on pavements, there has been limited exploration into the impact on pavement durability as a result of the installation of CLRS. The major purpose of this study was to corroborate what specific factors are controlling the cracking failures due to the installation of CLRS and f ...
  • Analytic Tools for Locating Sizing and Evaluating Electric Vehicle Charging Stations
    Analytic Tools for Locating, Sizing, and Evaluating Electric Vehicle Charging Stations
    Coenen, Steffen ;
    Aemmer, Zack
    2023-06-01 | PDF
    The Washington State Legislature directed the Department of Transportation to develop analytic tools “to enable coordinated, effective, efficient, and timely deployment of charging and refueling infrastructure necessary to support statewide and local transportation electrification efforts that result in emissions reductions” consistent with state g ...
  • Evaluating New Slurry and Plow Equipment Summary
    Evaluating New Slurry and Plow Equipment [Summary]
    Peters, Tom ;
    Hirt, Brian
    2023-06-01 | PDF
    MnDOT maintenance practitioners and managers are always looking for new and better ways to handle winter weather. To meet this need, an active winter maintenance equipment industry frequently puts forward new equipment for agencies like MnDOT to consider.
  • Evaluate the Impacts of Complete Streets Policy in Louisiana Tech Summary
    Evaluate the Impacts of Complete Streets Policy in Louisiana [Tech Summary]
    Bian, Ruijie “Rebecca”
    2023-06-01 | PDF
    The focus of this research project was to evaluate the impacts of the Complete Streets policy in Louisiana. The objectives of this research project included: (1) evaluating policy impacts to project scoping and delivery; (2) summarizing and evaluating what changes the agency has made in terms of documents, policies, staffing, training, etc. to adva ...
  • Crash Report Sampling System CRSS Motor Vehicle Crash Data Collection
    Crash Report Sampling System (CRSS): Motor Vehicle Crash Data Collection
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2023-06-01 | National Transportation Statistics (NTS) | PDF
    The National Highway Traffic Safety Administration has collected crash data since the early 1970s to support its mission to reduce motor vehicle crashes, injuries, and deaths on our Nation’s highways. The Crash Report Sampling System (CRSS) builds on the retired, long running National Automotive Sampling System General Estimates System (NASS GES). ...
  • Bigdata Analytics and Artificial Intelligence for Smart Intersections Summary
    Bigdata Analytics and Artificial Intelligence for Smart Intersections [Summary]
    Ranka, Sanjay ;
    Ponnaluri, Raj
    2023-06-01 | PDF
    This project aims to develop a multi-sensor system for vehicle and pedestrian traffic analysis at traffic intersections. The techniques developed as part of this project are used to process data streams from video-camera and LIDAR systems installed at traffic intersections (along with the loop detector data captured by advanced traffic controllers) ...
  • The Substance Abuse Professional Guidelines
    The Substance Abuse Professional Guidelines
    United States. Department of Transportation. Office of Drug and Alcohol Policy and Compliance
    2023-06-01 | PDF
    These Guidelines are provided to you by the U.S. Department of Transportation (DOT) Office of Drug and Alcohol Policy and Compliance (ODAPC). These Guidelines apply only to employers; individuals who are acting as a Substance Abuse Professional (SAP) for DOT- regulated employers; and employees subject to DOT regulation 49 CFR part 40 (Part 40) and ...
  • Usercentered Smart Traffic Sign Development Study
    User-centered Smart Traffic Sign Development Study
    Morris, Nichole L. ;
    Rajamani, Rajesh
    2023-06-01 | PDF
    Flaggers protect workers by providing temporary traffic control and maintaining traffic flow through a work zone. They are often the first line of defense to stop distracted, inattentive, or aggressive motorists from intruding into the work area. This project aims to develop an automated intrusion detection system to alert drivers who are unsafely ...
  • Designing Pedestrian Safety Features for YearRound Maintenance
    Designing Pedestrian Safety Features for Year-Round Maintenance
    Veneziano, David
    2023-06-01 | PDF
    Pedestrian fatalities make up almost 14% of traffic fatalities in Minnesota. While MnDOT continues to prioritize pedestrian safety, maintaining certain safety countermeasures can present challenges, particularly in winter. Keeping walkways, curb ramps, median refuge islands and other features safe requires keeping them free from snow and ice. Snowp ...
  • Impact of Production Variability on Balanced Mix Designs in Virginia
    Impact of Production Variability on Balanced Mix Designs in Virginia
    Bowers, Benjamin F. ;
    Lynn, Tiana
    2023-06-01 | PDF
    The objective of this study was to evaluate the influence of production variability on performance test results to determine if mixtures balanced during design could become unbalanced during production. Fourteen currently accepted mixture designs, 10 BMD mixtures and 4 Superpave mixtures (to serve as a comparison between current standards and BMD d ...
  • Assessment of Pipe Fill Heights
    Assessment of Pipe Fill Heights
    Urrego, Luz María Agudelo ;
    Savigamin, Chatuphat
    2023-06-01 | PDF
    The design of buried pipes, in terms of the allowable minimum and maximum cover heights, requires the use of both geotechnical and structural design procedures. The geotechnical procedure focuses on estimating the load on the pipe and the compressibility of the foundation soil. The focus of the structural design is choosing the correct cross-sectio ...
  • Crash Investigation Sampling System CISS Motor Vehicle Crash Data Collection
    Crash Investigation Sampling System (CISS): Motor Vehicle Crash Data Collection
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2023-06-01 | National Transportation Statistics (NTS) | PDF
    The National Highway Traffic Safety Administration has collected crash data since the early 1970s to support its mission to reduce motor vehicle crashes, injuries, and deaths on our Nation’s highways. The Crash Investigation Sampling System (CISS) builds on the retired, long running National Automotive Sampling System Crashworthiness Data System (N ...
  • Design and LifeCycle Assessment of Gabion Barriers for Rockfall Mitigation Using Numerical Modeling
    Design and Life-Cycle Assessment of Gabion Barriers for Rockfall Mitigation Using Numerical Modeling
    Knowles, Jeff ;
    Evans, T. Matthew
    2023-06-01 | PDF
    A Graphical User Interface (GUI) software is developed to perform numerical simulations in which gabion barriers are impacted by boulders of various geometries and initial momentum values. The results generated from this tool are used to develop design standards and life-cycle analysis procedures.
  • Traffic Safety Facts 2021 Data Bicyclists and Other Cyclists
    Traffic Safety Facts 2021 Data: Bicyclists and Other Cyclists
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2023-06-01 | PDF
    This fact sheet for 2021 covers bicycle crashes by age and sex; alcohol usage; crash characteristics; time of day and day of week; vehicle type and impact point; city; state; and important safety reminders. In 2021 there were 966 pedalcyclist fatalities, accounting for 2.2 percent of all traffic fatalities that year. In 2021 there was a 1.9-percent ...
  • Traffic Safety Facts 2021 Data Pedestrians
    Traffic Safety Facts 2021 Data: Pedestrians
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2023-06-01 | National Transportation Statistics (NTS) | PDF
    This fact sheet defines a pedestrian involved in a motor vehicle traffic crash as any person on foot, walking, running, jogging, hiking, sitting, or lying down. It excludes people on personal conveyances like roller skates, inline skates, skateboards, baby strollers, scooters, toy wagons, motorized skateboards, motorized toy cars, Segway-style devi ...
  • Identification of the Mechanisms That Produce Hydrogen Embrittlement on Posttensioning Members and the Effects of Galvanic Coupling on Bridge Tendons Summary
    Identification of the Mechanisms That Produce Hydrogen Embrittlement on Post-tensioning Members and the Effects of Galvanic Coupling on Bridge Tendons [Summary]
    McCollough, Timothy ;
    Alexander, Christopher L
    2023-06-01 | PDF
    University of South Florida and FDOT researchers hypothesized that galvanic coupling between the galvanized steel duct and the steel strands of bridge members could be one of the mechanisms behind hydrogen production – which accelerates the embrittlement of steel. The objective of this project was to identify the conditions that promote hydrogen pr ...
  • Traffic Safety Facts 2021 Data Passenger Vehicles
    Traffic Safety Facts 2021 Data: Passenger Vehicles
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis. Data Reporting and Information Division
    2023-06-01 | PDF
    In 2021 there were 26,325 passenger vehicle occupants who died in motor vehicle traffic crashes, a 10-percent increase from 23,914 in 2020. An estimated 2,092,541 passenger vehicle occupants were injured, a 10-percent increase from 1,907,011 in 2020. Passenger vehicles made up 92 percent of registered vehicles and accounted for 88 percent of total ...
  • Research on Assessment of Arizonas Partnering Activities in Construction Projects
    Research on Assessment of Arizona’s Partnering Activities in Construction Projects
    Keen Independent Research LLC
    2023-06-01 | PDF
    Keen Independent Research was engaged by the Arizona Department of Transportation (ADOT) to assess the effectiveness of its partnering program in construction projects. To achieve this objective, the study team analyzed and documented processes, tools, reporting, and other key elements of ADOT’s current partnering program, explored partnering pract ...
  • Best Practices for Improving Subgrade Drainage
    Best Practices for Improving Subgrade Drainage
    Johnson-Kaiser, Thomas ;
    Bekele, Marcus
    2023-06-01 | PDF
    This project developed a high-level best practices guidance document for the design/installation of subsurface drainage. This Tool serves as a guide to assist agencies in understanding drainage problems and options to consider for mitigating structural damage to pavements due to moisture. The weather and soil conditions vary drastically across Minn ...
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