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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 1461 - 1480 of 36873 results
  • Pavement Markings To Support Automated Vehicles Research Summary
    Pavement Markings To Support Automated Vehicles [Research Summary]
    Peterson, Ethan ;
    Pike, Adam
    2024-07-01 | PDF
    Pavement marking style and patterns have largely been designed based on human vision. MnDOT is completing a human factors study on pavement marking variations, A field study included data collected through various methods from test corridors in Minnesota and Texas during daytime and nighttime driving. A closed course at Texas A&M University allowed ...
  • Estimating the AsPlaced Grout Volume of Auger Cast Piles Part 1
    Estimating the As-Placed Grout Volume of Auger Cast Piles – Part 1
    Mullins, Gray ;
    Mee, Tristen
    2024-07-01 | PDF
    Auger cast piles have historically been used for private industry applications but not publicly funded infrastructure projects supporting bridge structures largely due to the lack of quantifiable quality assurance and quality controls. The development of computerized on-board drill rig monitoring systems and thermal integrity methods for auger cast ...
  • MiniRoundabout FAQs
    Mini-Roundabout FAQs
    Marti, Michael ;
    Heimer, Zach
    2024-07-01 | PDF
    Roundabouts have been effective at increasing safety and efficiency of vehicle traffic. Traditional roundabout design typically requires a larger “footprint” than a traditional four-way intersection. Over the past few years, more and more agencies are implementing “mini roundabouts,” a type of roundabout characterized by a small diameter that can i ...
  • Field Handbook for Maintenance and Preservation Treatments of Concrete Pavements
    Field Handbook for Maintenance and Preservation Treatments of Concrete Pavements
    Mirzahosseini, Mohammadreza ;
    Olek, Jan
    2024-07-01 | PDF
    Information related to maintenance and preservation (M&P) treatments of Portland cement concrete pavement (PCCP) has not been uniformly presented across various Indiana Department of Transportation (INDOT) maintenance-related documents, including INDOT Standard Specifications and the INDOT Design Manual. Since this data is scattered across differen ...
  • 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 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 ...
  • Traffic Safety Facts 2022 Data RuralUrban Traffic Fatalities
    Traffic Safety Facts 2022 Data: Rural/Urban Traffic Fatalities
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-07-01 | PDF
    Of the 42,514 motor vehicle traffic fatalities in 2022, there were 17,283 (41%) that occurred in rural areas, 25,023 (59%) in urban areas, and 208 (less than 1%) in areas that were not reported as rural or urban. In 2022, traffic fatalities in rural areas decreased slightly from 17,339 in 2021 to 17,283, and in urban areas decreased by 3 percent fr ...
  • 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 | Traffic Safety Facts | 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 ...
  • Managing Pavement Friction of Wyomings Roads Considering Safety
    Managing Pavement Friction of Wyoming’s Roads Considering Safety
    Haq, Muhammad Tahmidul ;
    Hafez, Marwan
    2024-07-01 | PDF
    This research addressed the management of pavement friction in Wyoming, focusing on its impact on road safety. The primary objective was to investigate the relationship between pavement surface friction and friction-related traffic crashes. Comprehensive data collection and advanced statistical methods, such as Bayesian analysis, were employed to a ...
  • Data Acquisition and Processing Using Artificial Intelligence and Machine Learning
    Data Acquisition and Processing Using Artificial Intelligence and Machine Learning
    Loos, Ryan ;
    Egge, Mark
    2024-07-01 | PDF
    Artificial intelligence (AI) and machine learning (ML) offer state transportation agencies promising tools to help them advance their missions by informing decision making; improving information accuracy, completeness, and timeliness; and automating tedious tasks to free up valuable DOT resources. The objective of this research was to provide MoDOT ...
  • 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
    ORCID ICON IMG
    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 ...
  • Automated Interpretation of Culvert Inspection Videos Using AI and Computer Vision
    Automated Interpretation of Culvert Inspection Videos Using AI and Computer Vision
    Mohammadi, Pouria ;
    Rashidi, Abbas
    2024-07-01 | PDF
    Culvert assets play a critical role in ensuring the safe operation of highways. UDOT maintains over 120,000 drainage culverts and storm drain pipes along state highways. To maintain these assets optimally and prevent failures, UDOT must collect comprehensive information about all culverts across the state and inventory them in the ATOM system. Accu ...
  • Development of a Salt Spreader Controller Program Using MachineSensed Roadway Weather Parameters
    Development of a Salt Spreader Controller Program Using Machine-Sensed Roadway Weather Parameters
    Ai, Chengbo ;
    Tessier, Russell
    2024-07-01 | PDF
    Massachusetts owns over 300 and contracts 1,200 additional material spreaders that deliver salt, salt, sand mixtures, or liquid deicers to more than 15,000 lane miles of roadways during winter seasons. It is critical to efficiently and effectively deliver the materials so that the impacts of winter storms on road operations are minimized while the ...
  • 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. ...
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