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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 1981 - 2000 of 36151 results
  • 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 ...
  • Load Rating for Corrugated Metal Culverts under Shallow Cover Depths
    Load Rating for Corrugated Metal Culverts under Shallow Cover Depths
    Anderson, J. Brian ;
    Davidson, James S.
    2023-06-01 | PDF
    The accuracy and applicability of existing methodologies and tools for load rating of corrugated metal culverts under shallow cover were thoroughly investigated through numerical modeling and field testing. The basis of three existing spreadsheet rating tools were investigated. Two existing culverts that are more than 80 years old and whose cover o ...
  • Designing and Implementing Maintainable Pedestrian Safety Countermeasures
    Designing and Implementing Maintainable Pedestrian Safety Countermeasures
    Veneziano, David ;
    Wood, Jonathan
    2023-06-01 | PDF
    While pedestrian safety countermeasures contribute to reducing vehicle-pedestrian crashes, their impacts on winter maintenance operations are sometimes overlooked during design. There is a need to investigate the best practice guidance and solutions for the design, installation and maintenance of pedestrian safety features for year-round maintenanc ...
  • Guidelines for Safer Pedestrian Crossings Understanding the Factors That Positively Influence Vehicle Yielding to Pedestrians at Unsignalized Intersections
    Guidelines for Safer Pedestrian Crossings: Understanding the Factors That Positively Influence Vehicle Yielding to Pedestrians at Unsignalized Intersections
    Stern, Raphael ;
    Li, Tianyi
    2023-06-01 | PDF
    Many factors influence an individual driver’s decision to yield or not yield to individual pedestrians attempting to cross the road at an unsignalized crossing. This study collects observational data from more than 3,300 crossing events at 18 intersections in Minnesota to further our understanding of what factors positively influence driver yieldin ...
  • Comparing the CostEffectiveness of Asphalt Binders for Local Roads
    Comparing the Cost-Effectiveness of Asphalt Binders for Local Roads
    Marasteanu, Mihai
    2023-06-01 | PDF
    Polymer-modified binders (PMB) have been shown over the decades to improve the mechanical properties of asphalt mixtures compared to unmodified binders. Considering its higher initial cost, selecting the best alternative is very important, especially for local agencies, given their limited budgets. A challenge in the materials selection process for ...
  • Merging Multiple Existing Geotechnical Databases
    Merging Multiple Existing Geotechnical Databases
    Sun, Charlie ;
    Rister, Brad
    2023-06-01 | PDF
    This report discusses a project undertaken by Kentucky Transportation Center (KTC) researchers to create a comprehensive geotechnical database for highway planning, design, maintenance, and repair. The project consolidated multiple geotechnical data sources into a unified database accessible to Kentucky Transportation Cabinet (KYTC) staff, enabling ...
  • Analysis of Local Bus Markets Phase III
    Analysis of Local Bus Markets, Phase III
    Devajyoti, Deka ;
    Carnegie, Jon A.
    2023-06-01 | PDF
    This research is a follow-up of the Analysis of Local Markets Phase I and Phase II studies conducted by the Alan M. Voorhees Transportation Center during 2015-18. Whereas the primary objectives of the Phase I study were to examine both traffic (i.e., congestion) and air quality (i.e., emission) impacts of local buses, the primary objective of the P ...
  • Traffic Safety Facts 2021 Data Large Trucks
    Traffic Safety Facts 2021 Data: Large Trucks
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2023-06-01 | PDF
    In 2021 there were 5,788 people killed in traffic crashes involving large trucks. This was a 17-percent increase from 4,945 in 2020. Seventy-two percent of people killed in large-truck traffic crashes in 2021 were occupants of other vehicles. Seventy-eight percent of the fatal traffic crashes involving large trucks in 2021 occurred on weekdays (6 a ...
  • Traffic Safety Facts 2021 Data AlcoholImpaired Driving
    Traffic Safety Facts 2021 Data: Alcohol-Impaired Driving
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2023-06-01 | National Transportation Statistics (NTS) | PDF
    Drivers are considered to be alcohol-impaired when their blood alcohol concentrations (BACs) are .08 grams per deciliter (g/dL) or higher. Thus, any fatal crash involving a driver with a BAC of .08 g/dL or higher is considered to be an alcohol-impaired-driving crash, and fatalities occurring in those crashes are considered to be alcohol-impaired-dr ...
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