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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 2361 - 2380 of 36873 results
  • 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 | 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 | 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 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 | 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 ...
  • 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 | 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 ...
  • Simplified Analysis Methods of TSD and FWD Data for Effective Pavement Preservation Program
    Simplified Analysis Methods of TSD and FWD Data for Effective Pavement Preservation Program
    Kassem, Emad ;
    Muftah, Ahmed
    2023-06-01 | PDF
    Pavement evaluation is critical for determining proper and cost-effective surface treatments and allocation of limited funds and resources to maintain, rehabilitate and reconstruct flexible pavements. This study examined two nondestructive testing devices that are used to evaluate the structural capacity and integrity of highway pavements including ...
  • Developing Enhanced Performance Curves of ITD Asphalt Pavements by Mining the Historical Data
    Developing Enhanced Performance Curves of ITD Asphalt Pavements by Mining the Historical Data
    Deng, Yong ;
    Shi, Xianming
    2023-06-01 | PDF
    Current ITD approach to predict asphalt pavement performance over-simplifies the dynamic and nonlinear nature of pavement deterioration and fails to account for complexities in the pavement condition. As such, this project aimed to develop reliable, realistic and enhanced performance curves for ITD asphalt pavements by mining the historical data. T ...
  • 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.
  • Assessment of Motorcycle Safety in Wyoming Fatal and Severe Crashes Contributing Factors and Potential Countermeasures Addendum
    Assessment of Motorcycle Safety in Wyoming: Fatal and Severe Crashes, Contributing Factors and Potential Countermeasures [Addendum]
    Zlatkovic, Milan ;
    Baah, Isaac
    2023-06-01 | PDF
    Motorcycle riders and passengers are much more likely to be killed or severely injured in a crash, and on average about 15 percent of all traffic fatalities include motorcyclists. Motorcyclists and their passengers are particularly vulnerable on the roads, which accounts for their higher percentage of fatal and severe crash accidents. To take appro ...
  • 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) ...
  • 07033 Defining Operational Design Domains ODDs for the Safe Blending of Levels 04 Connected and Autonomous Vehicles CAVs in the Traffic Streams
    0-7033: Defining Operational Design Domains (ODDs) for the Safe Blending of Levels 0-4 Connected and Autonomous Vehicles (CAVs) in the Traffic Streams
    Chin, Kristie ;
    Wang, Junmin
    2023-05-31 | PDF
    Automated vehicles (AVs) present significant potential; yet, their technological maturity and performance remain to be proven. With several deployments underway in the state, it is critical for the Texas Department of Transportation (TxDOT) to provide the public with assurances that the AVs are performing safely in their intended operational enviro ...
  • Expanding the NCDOTs Current Risk Management Program
    Expanding the NCDOT’s Current Risk Management Program
    Jaselskis, Edward J. ;
    Gholami, Sina
    2023-05-31 | PDF
    Enhancing the risk management program within the North Carolina Department of Transportation (NCDOT) is the focus of this collaborative research project with North Carolina State University (NCSU). The objective is to provide valuable insights and best practices to strengthen the NCDOT's Value Management Office (VMO) and implement an effective risk ...
  • Development of NonFracture Critical Steel Box Straddle Caps Project Summary Report
    Development of Non-Fracture Critical Steel Box Straddle Caps [Project Summary Report]
    Helwig, Todd ;
    Zecchin, Esteban
    2023-05-31 | PDF
    The research study included full-scale experimental testing and parametric finite element (FE) analyses, which resulted in a proposed methodology to estimate the flexural resistance of steel box caps following a potential fracture event. The work was conducted at the Ferguson Structural Engineering Laboratory at The University of Texas at Austin. T ...
  • Developing a Safe System Approach to Setting Speed Limits
    Developing a Safe System Approach to Setting Speed Limits
    Griswold, Julia B ;
    Lutzker, Liza
    2023-05-31 | PDF
    Over the last decade in California there has been a surge in the number of traffic fatalities, with especially large increases in pedestrian fatalities. At the same time, the California Department of Transportation (Caltrans) has affirmed a vision of reaching zero fatalities and serious injuries on state highways by 2050 and has committed the depar ...
  • Inventory Operations and Safety at Free RightTurn Ramps
    Inventory, Operations, and Safety at Free Right-Turn Ramps
    Khattak, Aemal J. ;
    Camenzind, Jonathon
    2023-05-31 | PDF
    This research focused on traffic safety and operational performance of rural, minor approach stop-controlled intersections with free right-turn (FRT) ramps. The objectives of the research were to: • Create a statewide inventory of rural FRT ramp intersections and provide to the Nebraska Department of Transportation (NDOT), • Using NDOT 10-year cras ...
  • Nebraska Balanced Mix Design Phase I
    Nebraska Balanced Mix Design – Phase I
    Yazdipanah, Farzad ;
    Khedmati, Mahdieh
    2023-05-31 | PDF
    Balanced mix design (BMD) is an alternative concept for designing asphalt mixtures that mainly focuses on performance of mixtures rather than only volumetric analysis. Using this concept, it would be possible to account for the incorporation of recycled asphalt mixtures, warm technology, polymers, rejuvenators, and other foreign additives, as well ...
  • ALTRIOS Advanced Locomotive Technology and Rail Infrastructure Optimization System
    ALTRIOS - Advanced Locomotive Technology and Rail Infrastructure Optimization System
    National Renewable Energy Laboratory (NREL) (U.S.)  ...
    2023-05-17 | PDF
    The Advanced Locomotive Technology and Rail Infrastructure Optimization System (ALTRIOS) is an open-source modeling framework developed to evaluate strategies for decarbonizing freight rail transportation. Introduced at the 2023 FRA Workshop on Decarbonization of Rail Transportation, ALTRIOS simulates train dynamics, powertrain performance, energy ...
  • Greenhouse Gas Emissions Inventory from Construction of Washington State Department of Transportation Roadways Final Report
    Greenhouse Gas Emissions Inventory from Construction of Washington State Department of Transportation Roadways: Final Report
    Ashtiani, Milad ;
    Lewis, Meghan
    2023-05-16 | PDF
    Recent emphasis on actions to reduce large-scale greenhouse gas (GHG) emissions has pushed most state departments of transportation (DOTs) to develop carbon accounting practices compatible with their current standard data collection and storage practices. In particular, with the recently passed Buy Clean Acts in California, Colorado, and Oregon and ...
  • Evaluate Geophysical Methods to Detect Underground Voids Project Summary
    Evaluate Geophysical Methods to Detect Underground Voids [Project Summary]
    Kallivokas, Loukas ;
    Cai, Mingwei
    2023-05-05 | PDF
    The primary objective of the project is to lend clarity on the applicability and limitations of each one of the four geophysical methods, while also arriving at recommendations for the most appropriate course of action when faced with site investigations aimed at detecting the presence of voids.
  • Assessing Axial Capacities of Auger Cast Piles from Measuring While Drilling Summary
    Assessing Axial Capacities of Auger Cast Piles from Measuring While Drilling [Summary]
    Herrera, Rodrigo ;
    Rodgers, Michael
    2023-05-01 | PDF
    Developing a comprehensive subsurface profile can be difficult, especially in certain areas in Florida where sandy soils with varying amounts of fines, clay, muck/peat and vuggy limestone formations add to the uncertainty of the overall response that can be expected from drilled-in-place deep foundations. Measuring while drilling (MWD) was develope ...
  • Pedestrian Traffic Signal Violations Safety Design and Operational Implications
    Pedestrian Traffic Signal Violations: Safety, Design, and Operational Implications
    Singleton, Patrick A. ;
    Mekker, Michelle
    2023-05-01 | PDF
    The objective of this research project is to improve pedestrian safety at signalized intersections by focusing on pedestrian signal violations: measuring behaviors, associating characteristics and locations, and identifying potential mitigation strategies. In this project, we recorded videos and collected and analyzed observational data on pedestri ...
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