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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 1701 - 1720 of 35478 results
  • 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 ...
  • 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 ...
  • Assessment of the Mobility Energy Productivity MEP Metric for Transportation Applications in Florida
    Assessment of the Mobility Energy Productivity (MEP) Metric for Transportation Applications in Florida
    Jin, Xia ;
    Frolich, Daniel
    2023-06-01 | PDF
    This report outlines the use and application of the Mobility Energy Productivity (MEP) tool in evaluating the efficiency of transportation systems. The MEP metric assesses the quality of mobility in transportation systems, considering accessibility, energy consumption, and productivity. It incorporates time, cost, and energy-related measurements to ...
  • Environment for Testing and Assessing Infrastructure Support of Connected Vehicle and Cooperative Highway Automation Applications
    Environment for Testing and Assessing Infrastructure Support of Connected Vehicle and Cooperative Highway Automation Applications
    Hadi, Mohammed ;
    Mata, Hector
    2023-06-01 | PDF
    The consideration of cooperative driving automation (CDA) in the transportation system management and operations (TSM&O ) processes has the potential for improving system performance in terms of safety, mobility, environmental impacts, and user satisfaction and acceptance. The goal of this project is to provide recommendations regarding the incorpo ...
  • Design and Demonstration of an ArterialFriendly Local Ramp Metering Control System
    Design and Demonstration of an Arterial-Friendly Local Ramp Metering Control System
    Ke, Zemian ;
    Liu, Jiachao
    2023-06-01 | PDF
    This project aims to develop, assess, and optimize control strategies for ramp metering and local signal synchronization in Maryland's Transportation Systems Management and Operations (TSMO) 1 system (I-70 corridor east of Baltimore, MD). The methodology and mesoscopic simulation model can be generally applicable to other networks and TSMO systems. ...
  • 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 ...
  • Phase I Before Study Evaluation of Interstate 4 I4 Floridas Regional Advanced Mobility Elements FRAME Project Before Analysis Summary
    Phase I: Before Study Evaluation of Interstate 4 (I-4) Florida’s Regional Advanced Mobility Elements (FRAME) Project (Before Analysis) [Summary]
    Ponnaluri, Raj ;
    Abdel-Aty, Mohamed
    2023-06-01 | PDF
    The best way to find out if a transportation research project was meaningful is to check the numbers. The Florida Department of Transportation is laying the foundation to do that with a massive new undertaking that aims to capture safety and mobility conditions along Interstate 4 (I-4) from Orlando to Tampa.
  • Evaluation of SaturatesAromaticsResinsAsphaltenes SARA Fractionation of Asphalt Binders in Louisiana Research Project Capsule 221B
    Evaluation of Saturates/Aromatics/Resins/Asphaltenes (SARA) Fractionation of Asphalt Binders in Louisiana: Research Project Capsule [22-1B]
    Salari, Saman ;
    Mayeux, Corey R
    2023-06-01 | PDF
    The objective of this research is to evaluate the characterization of asphalt binder through TLC/FID testing and SARA grouping. The results will be further analyzed and compared with the available GPC results and other available characterizations of the asphalt binders. Furthermore, the results will be correlated with performance.
  • Effect of Fillers on the Moisture Resistance and Performance of HMA Research Project Capsule 231B
    Effect of Fillers on the Moisture Resistance and Performance of HMA: Research Project Capsule [23–1B]
    Elseifi, Mostafa ;
    Rupnow, Tyson
    2023-06-01 | PDF
    The main objectives of the proposed study are two-fold: 1. To evaluate the effects of various types of inert and active fillers on the moisture resistance and laboratory performance of asphalt mixtures. 2. To propose change to the specifications to optimize the use of mineral fillers in hot-mix asphalt (HMA).
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