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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 1841 - 1860 of 35865 results
  • 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 ...
  • 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 ...
  • Traffic Safety Facts 20122021 Data SchoolTransportationRelated Crashes
    Traffic Safety Facts 2012-2021 Data: School-Transportation-Related Crashes
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2023-06-01 | National Transportation Statistics (NTS) | PDF
    A school-transportation-related crash is a motor vehicle traffic crash that directly or indirectly involves a school transportation vehicle that is either a school bus body type or a non-school-bus functioning as a school bus, transporting children to and from school or school-related activities. For the purposes of this fact sheet, school-age chil ...
  • 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). ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Analysis of Local Bus Markets Phase III Technical Brief
    Analysis of Local Bus Markets, Phase III [Technical Brief]
    Deka, Devajyoti ;
    Carnegie, Jon A.
    2023-06-01 | PDF
    Despite having an extensive network of public transit, traffic congestion and transportation-related greenhouse gas (GHG) emissions are significant concerns in New Jersey. This research examines the GHG impacts of NJ TRANSIT local buses in the greater Newark area service region. It involved a large-scale onboard survey of bus riders on 40 NJ TRANSI ...
  • 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) ...
  • 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 Motorcycles
    Traffic Safety Facts 2021 Data: Motorcycles
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2023-06-01 | PDF
    In 2021 there were 5,932 motorcyclists killed, 14 percent of all traffic fatalities. This is the highest number of motorcyclists killed since FARS started data collection in 1975. The number of motorcyclist fatalities in 2021 increased by 8 percent from 2020, from 5,506 to 5,932. An estimated 82,686 motorcyclists were injured in 2021, a 5-percent i ...
  • 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 ...
  • 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 State AlcoholImpairedDriving Estimates
    Traffic Safety Facts 2021 Data: State Alcohol-Impaired-Driving Estimates
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2023-06-01 | PDF
    This fact sheet covers estimates of alcohol-impaired driving by state. Of the 42,939 traffic fatalities in 2021 there were an estimated 13,384 people (31%) killed in alcohol-impaired-driving crashes. The highest percentage was in Montana (44%), followed by Texas (42%). Of the 60,904 drivers involved in fatal traffic crashes in 2021 there were an es ...
  • 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.
  • Evaluating MnDOTs Turfgrass Seed Variety List and Approval Process Technical Summary
    Evaluating MnDOT’s Turfgrass Seed Variety List and Approval Process [Technical Summary]
    Watkins, Eric
    2023-06-01 | PDF
    This project addresses two critical needs: to update existing Minnesota Department of Transportation (MnDOT) turfgrass recommendation lists and to develop a new process to keep lists continually updated in a fair manner with data-driven recommendations. The authors evaluated the current list of MnDOT-approved turfgrass varieties and found underperf ...
  • 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 ...
  • Impact of Speed Limit Changes on Urban Streets
    Impact of Speed Limit Changes on Urban Streets
    Davis, Gary A.
    2023-06-01 | PDF
    In 2019 the Minnesota Legislature amended that state’s statutes to allow cities to set speed limits on city-owned streets. In February 2021 the authors surveyed 33 cities within the Twin Cities metro area and identified the city of St. Louis Park as planning to implement a city-wide change in speed limits, with a default speed limit of 20 mph but w ...
  • Developing Safety Performance Function and Crash Modification Factor for Managed Lanes Separation Treatments Summary
    Developing Safety Performance Function and Crash Modification Factor for Managed Lanes Separation Treatments [Summary]
    Ponnaluri, Raj ;
    Alluri, Priyanka
    2023-06-01 | PDF
    How does a large state with growing traffic volumes maintain the safety and mobility of its traveling public? Managed lanes are one option. With managed lanes, the use of the lane changes depending on traffic conditions. These can either be a traditional non-reversible lane for each direction of travel or reversible, where the direction of traffic ...
  • 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 ...
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