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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 1081 - 1100 of 36049 results
  • Data Acquisition and Processing Using Artificial Intelligence and Machine Learning Research Summary
    Data Acquisition and Processing Using Artificial Intelligence and Machine Learning [Research Summary]
    Loos, Ryan
    2024-07-01 | PDF
    This research provides MoDOT with an opportunity to “kick the tires” with AI and ML and better understand how these powerful technologies can help the agency meet its present and future challenges. This report—and the research activities preceding it—endeavors to equip MoDOT with the necessary knowledge and evaluative framework to effectively asses ...
  • Traffic Safety Facts 2022 Data Passenger Vehicles
    Traffic Safety Facts 2022 Data: Passenger Vehicles
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-07-01 | PDF
    In 2022 there were 25,420 passenger vehicle occupants who died in motor vehicle traffic crashes, a 4-percent decrease from 26,465 in 2021. An estimated 1,900,539 passenger vehicle occupants were injured, a 9-percent decrease from 2,092,743 in 2021. Passenger vehicles made up 92 percent of registered vehicles and accounted for 88 percent of total ve ...
  • Determining Bearing Stress for MSE Retaining Structures
    Determining Bearing Stress for MSE Retaining Structures
    Anderson, J. Brian ;
    Okafor, Chukwuma C
    2024-07-01 | PDF
    This study investigated the bearing stress imparted by a Mechanically Stabilized Earth (MSE) retaining system. Use of the MSE system is notable for the associated cost efficiency, flexibility, and high deformation tolerance compared to traditional concrete retaining systems. There have been recent cases highlighting the need for substantial foundat ...
  • Connected Autonomous Shuttle Supporting Innovation CASSI at UNC Charlotte
    Connected Autonomous Shuttle Supporting Innovation (CASSI) at UNC Charlotte
    Searcy, Sarah ;
    Lape, Doug
    2024-07-01 | PDF
    The North Carolina Department of Transportation (NCDOT) partnered with the University of North Carolina at Charlotte (UNC Charlotte) and Beep, Inc. (Beep) to bring a novel-design, all-electric, low-speed automated shuttle to UNC Charlotte’s campus for a 23-week pilot through the Connected Autonomous Shuttle Supporting Innovation (CASSI) program. Be ...
  • Best Practices for Bridges with Pipe Piles
    Best Practices for Bridges with Pipe Piles
    Huff, Tim ;
    VandenBerge, Daniel
    2024-07-01 | PDF
    Pipe piles are used extensively for bridge substructures in Tennessee. This research serves to develop a systematic approach to the selection and the design of pipe pile-supported substructures, both piers and abutments. Included are both a design manual and design examples, for the design of three pipe pile-supported pile bents: (1) pipe pile bent ...
  • Striping Program Research Summary
    Striping Program [Research Summary]
    Brown, Henry
    2024-07-01 | PDF
    The objective of this research study is to synthesize existing research and DOT practices regarding the use of wider edge line markings on all roads and the use or non-use of pavement markings on low volume roads to facilitate the evaluation of tradeoffs between different pavement marking strategies.
  • Traffic Safety Facts 2022 Data Motorcycles
    Traffic Safety Facts 2022 Data: Motorcycles
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-07-01 | PDF
    In 2022 there were 6,218 motorcyclists killed, 15 percent of all traffic fatalities. The number of motorcyclist fatalities in 2022 increased by 1 percent from 2021, from 6,143 to 6,218. An estimated 82,687 motorcyclists were injured in 2022, a 3-percent decrease from 84,898 motorcyclists injured in 2021. Per vehicle miles traveled in 2022, the fata ...
  • Traffic Safety Facts 2022 Data Pedestrians
    Traffic Safety Facts 2022 Data: Pedestrians
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-07-01 | PDF
    In 2022 there were 7,522 pedestrians killed in traffic crashes, a 0.7-percent increase from the 7,470 pedestrian fatalities in 2021. It is the highest since 1981 when 7,837 pedestrians died in traffic crashes. In 2022 there were an estimated 67,336 pedestrians injured in traffic crashes, an 11-percent increase from 60,579 pedestrians injured in 202 ...
  • Performance Testing of GRS Test Piers Constructed With Florida Aggregates Axial Load Deformation Relationships
    Performance Testing of GRS Test Piers Constructed With Florida Aggregates – Axial Load Deformation Relationships
    Wasman, Scott ;
    Matemu, Christian
    2024-07-01 | PDF
    A series of full-scale axial load-deformation tests on instrumented GRS piers were conducted using materials approved for use in Florida. The piers were designed and constructed following the FHWA and FDOT guidelines for dimensional ratio of height/width = 2, compacted backfill of poorly graded No. 57, well graded RCA-GAB, and a LWA (as a trial exp ...
  • Early Age Concrete Acceptance
    Early Age Concrete Acceptance
    Mohr, Benjamin ;
    Islam, M. Shariful
    2024-06-30 | PDF
    The Tennessee Department of Transportation (TDOT) is administering more early strength requirements due to accelerated project delivery timelines. Therefore, the main objective of the current study was to establish a non-destructive procedure to predict the strength at an early age. For this, the Nurse-Saul maturity function was considered with a d ...
  • NonNuclear Moisture Content and Density Determination
    Non-Nuclear Moisture Content and Density Determination
    Coffman, Richard A. ;
    Barry, Michelle L
    2024-06-28 | PDF
    Adequate soil compaction is important for the stability and safety of structures and transportation infrastructure. Thus, methods utilized to obtain properties that control the quality of compaction in the field are essential to ensure proper construction. The most common method to measure these properties in the field is the Nuclear Density Gauge. ...
  • Electronic Water Level Sensors for Monitoring Scour Critical Structures
    Electronic Water Level Sensors for Monitoring Scour Critical Structures
    Kerkez, Branko ;
    Galvin, Kate Kusiak
    2024-06-28 | PDF
    This report details a research project aimed at developing and deploying a cost-effective water level sensor network for monitoring scour critical bridges in Michigan. The project involved a comprehensive review of existing water level monitoring technologies, followed by the selection and pilot deployment of Open-Storm sensors on over 30 bridges a ...
  • Development of Pavement Performance Models for MDOT A Neural Network Approach
    Development of Pavement Performance Models for MDOT: A Neural Network Approach
    Yasarer, Hakan ;
    Najjar, Yacoub M.
    2024-06-26 | PDF
    The continuous investigation into the mechanical properties and rehabilitation management of existing pavements is vital for the sustainability and efficiency of transportation systems. The Mississippi Department of Transportation (MDOT) database, containing over 40 million records, necessitates modernized decision-making models that align with cur ...
  • Highway Sign Support Systems Condition Assessment Deterioration Models and Asset Management
    Highway Sign Support Systems: Condition Assessment Deterioration Models and Asset Management
    Salama, Talat ;
    Chae, Andy M
    2024-06-20 | PDF
    Sign support systems are important structures in the Connecticut Department of Transportation (CTDOT) bridge management system. Periodic inspections and maintenance activities are needed as long-term cost-effective maintenance strategy. This research provided the deterioration model and asset management plan for sign support systems to be considere ...
  • Bridge Deck NonDestructive Evaluation Testing Advanced Technology for Bridge Asset Management
    Bridge Deck Non-Destructive Evaluation Testing - Advanced Technology for Bridge Asset Management
    Kooban, Farhad ;
    Radlińska, Aleksandra
    2024-06-11 | PDF
    This report presents the findings from the comprehensive study on Bridge Deck Non-Destructive Evaluation (NDE) Testing conducted by The Pennsylvania State University under the sponsorship of the Pennsylvania Department of Transportation (PennDOT). The study focuses on the application of advanced non-destructive technologies to assess the condition ...
  • Workflows Implementation Tools and Guidance for Efficient UAVenabled Bridge Inspection
    Workflows, Implementation Tools, and Guidance for Efficient UAV-enabled Bridge Inspection
    Karimoddini, Ali ;
    Cavalline, Tara L
    2024-06-05 | PDF
    This project developed workflows and tools to advance the implementation and adoption of UASs to support bridge inspection practices. A series of workflows was developed to guide inspection personnel when conducting UAS- enabled bridge inspections, and guidance was prepared to assist agencies in the identification of bridge and site characteristics ...
  • Research Solutions Reclaimed Asphalt May Offer Resource Savings and Improved Pavement Performance Brief
    Research Solutions — Reclaimed Asphalt May Offer Resource Savings and Improved Pavement Performance [Brief]
    Iowa State University. Institute for Transportation
    2024-06-01 | PDF
    The main purpose of the proposed research is to develop a mix design procedure for high RAM mixtures with both rejuvenators and fractionated RAM materials for Iowa DOT and local public agencies by thoroughly understanding complex interactions between fractionated RAM and rejuvenators. Main objectives of this research are to: 1) examine the effects ...
  • RealTime Traffic Signal System Performance Measurement Project No 201614 Phase III System Integration Intersection Deployment and Control Center Dashboard Development Brief
    Real-Time Traffic Signal System Performance Measurement (Project No. 2016–14) Phase III: System Integration, Intersection Deployment, and Control Center Dashboard Development [Brief]
    Jin, Peter J. ;
    Brennan, Jr. Thomas M.
    2024-06-01 | PDF
    Traffic signal performance measurement and visualization provide insights as operational tools to help traffic management centers get more benefits from infrastructure investment. ATSPM system uses high-resolution (0.1 sec) data to support the data-driven decision-making process and allows consistent and dynamic monitoring of signal-controlled inte ...
  • A Scoping Review of Artificial Intelligence Applications in Airports
    A Scoping Review of Artificial Intelligence Applications in Airports
    Amiri, Misagh Haji ;
    Kuşakcı, Ali Osman
    2024-06-01 | PDF
    This paper aims to synthesize the literature on the application of artificial intelligence (AI) for airports. The selected methodology was based on the PRISMA Extension for Scoping Reviews (PRISMA-ScR), a recognized framework for systematic reviews. Authors searched the Scopus and Web of Science databases for articles that met the following criteri ...
  • Struggling To Connect Housing and Transportation Challenges of LowIncome Suburban Residents in the San Francisco Bay Area
    Struggling To Connect: Housing and Transportation Challenges of Low-Income Suburban Residents in the San Francisco Bay Area
    Pan, Alexandra ;
    Deakin, Elizabeth
    2024-06-01 | PDF
    Suburban areas have lower density development than urban areas, which may make them less accessible for the growing population of low- and moderate-income suburban residents, particularly those without a personal vehicle. This research examines factors that lead these households to move to suburban areas and identifies accessibility barriers they f ...
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