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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 801 - 820 of 35448 results
  • Expanding Connected Vehicle Data Sources to Increase Applications and Use on Texas Roadways
    Expanding Connected Vehicle Data Sources to Increase Applications and Use on Texas Roadways
    McAuley, Anna ;
    Gold, Andrea
    2024-07-01 | PDF
    As connected freight and passenger vehicles become increasingly present on Texas roadways, the need for real-time, accurate, and cohesive data is growing. In some cases, this data is reliable and readily available to public agencies. In other cases, there are gaps in data availability or quality. A connected vehicle data framework (CVDF) enables th ...
  • 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 ...
  • Local Verification of AASHTOWareTM Pavement ME Design for Flexible Pavement
    Local Verification of AASHTOWareTM Pavement ME Design for Flexible Pavement
    Tran, Nam ;
    Ajede, Akeem
    2024-07-01 | PDF
    This research project conducted a local verification to assess the accuracy of globally calibrated Pavement ME Design distress and smoothness models for asphalt pavements in Alabama. Pavement sections included LTPP test sections in Alabama and neighboring states, as well as sections tested at the NCAT Test Track. Results showed significant bias in ...
  • OSTR Research Roundup Newsletter July 2024
    OST-R Research Roundup Newsletter: July 2024
    United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology
    2024-07-01 | OST-R Research Roundup | PDF
    News from across OST-R and its research community.
  • Evaluation of Corrosion Prevention and Mitigation Approaches Used on Texas Bridges Volume 1 Steel Girder Bridges
    Evaluation of Corrosion Prevention and Mitigation Approaches Used on Texas Bridges -- Volume 1: Steel Girder Bridges
    Hurlebaus, Stefan ;
    Birely, Anna C.
    2024-07-01 | PDF
    Corroded steel members cause significant risk to the durability of steel bridges, leading to costly failures and endangering public safety. Thus, it is essential to implement effective corrosion prevention and mitigation strategies to ensure the long-term durability of steel girders and reduce risks associated with corrosion activities. The Texas D ...
  • Domestic Airline Fares Consumer Report First Quarter 2024 Passenger and Fare Information
    Domestic Airline Fares Consumer Report: First Quarter 2024 Passenger and Fare Information
    United States. Department of Transportation
    2024-07-01 | Domestic Airline Fares Consumer Report | PDF
    Each month the Department of Transportation releases an Air Travel Consumer Report that includes information about various service quality elements, including flight delays, mishandled baggage, over sales, and a variety of other types of consumer complaints. In response to an increasing number of inquiries from consumers about domestic airline pric ...
  • Evaluation of Corrosion Prevention and Mitigation Approaches Used on Texas BridgesVolume 2 Reinforced Concrete Bridges
    Evaluation of Corrosion Prevention and Mitigation Approaches Used on Texas Bridges—Volume 2: Reinforced Concrete Bridges
    Hurlebaus, Stefan ;
    Birely, Anna C.
    2024-07-01 | PDF
    Corrosion in reinforced concrete is a self-accelerating process. As rust forms on steel, it enlarges in size and exerts tension on concrete, causing cracks and further corrosion in steel. The Texas Department of Transportation spends millions of dollars every year for repair and maintenance of concrete bridges; thus, a comprehensive study is essent ...
  • Traffic Safety Facts 2022 Data Large Trucks
    Traffic Safety Facts 2022 Data: Large Trucks
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-07-01 | PDF
    In 2022 there were 5,936 people killed in traffic crashes involving large trucks. This was a 2-percent increase from 5,821 in 2021. Seventy percent of people killed in large-truck traffic crashes in 2022 were occupants of other vehicles. Seventy-six percent of the fatal traffic crashes involving large trucks in 2022 occurred on weekdays (6 a.m. Mon ...
  • Traffic Safety Facts 2022 Data Young Drivers
    Traffic Safety Facts 2022 Data: Young Drivers
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-07-01 | PDF
    In 2022 there were 2,034 young drivers who died in traffic crashes, a 5-percent decrease from 2,133 in 2021. The number of licensed young drivers increased by 0.3 percent from 2021 to 2022. In 2022 there were an estimated 180,353 young drivers injured in traffic crashes, a decrease of 11 percent from 203,276 in 2021. The term young driver refers to ...
  • 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 ...
  • 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 ...
  • Identifying Transit Corridors With Greatest Potential To Benefit From Transit Signal Priority
    Identifying Transit Corridors With Greatest Potential To Benefit From Transit Signal Priority
    Sheffield, Michael H
    2024-07-01 | PDF
    Transit signal priority (TSP) is an operational strategy that facilitates the movement of transit vehicles through signal-controlled intersections. Transit vehicle delay can occur for many reasons including traffic congestion, passenger boarding and alighting, traffic signal operations, and other factors but TSP is specifically aimed at reducing de ...
  • North Dakota Statewide Traffic Safety Survey 2024 Traffic Safety Performance Measures for State and Federal Agencies
    North Dakota Statewide Traffic Safety Survey, 2024: Traffic Safety Performance Measures for State and Federal Agencies
    Vachal, Kimberly ;
    Kubas, Andrew
    2024-07-01 | PDF
    The United States trails other developed countries in several transportation safety metrics. One metric, road traffic death rate, is higher than in other developed countries (World Health Organization 2024) (Figure 1.1). Progress has been made to reduce the number of traffic-related fatalities, but crashes resulting in death, injury, and property d ...
  • 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 ...
  • Findings From the Pavement Preservation Group PG Study
    Findings From the Pavement Preservation Group (PG) Study
    Vargas-Nordcbeck, Adriana ;
    Geib, Jerry
    2024-07-01 | PDF
    State and local agencies often face the challenge of managing their pavement networks with limited resources. The natural degradation of new pavements, influenced by traffic loads and environmental factors, necessitates attention. Extending the service life of pavements without resorting to costly rehabilitation or reconstruction activities is feas ...
  • Traffic Safety Facts 2022 Data Speeding
    Traffic Safety Facts 2022 Data: Speeding
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-07-01 | PDF
    Twenty-eight percent of fatal crashes, 12 percent of injury crashes, and 8 percent of property-damage-only crashes in 2022 were speeding-related traffic crashes. In 2022 there were 12,151 fatalities in speeding-related crashes, 29 percent of total traffic fatalities for the year and a decrease of 3 percent from 12,498 in 2021. There were an estimat ...
  • 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 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 ...
  • 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 ...
  • Traffic Safety Facts 2022 Data Bicyclists and Other Cyclists
    Traffic Safety Facts 2022 Data: Bicyclists and Other Cyclists
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-07-01 | PDF
    In 2022 there were 1,105 pedalcyclist fatalities, accounting for 2.6 percent of all traffic fatalities. In 2022 there was a 13-percent increase in pedalcyclists killed (1,105) from the 976 pedalcyclists killed in 2021. In 2022 an estimated 46,195 pedalcyclists were injured, an 11-percent increase from 41,615 pedalcyclists injured in 2021. In 2022 t ...
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