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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 1361 - 1380 of 35448 results
  • OSTR Research Roundup Newsletter October 2023
    OST-R Research Roundup Newsletter: October 2023
    United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology
    2023-10-01 | OST-R Research Roundup | PDF
    News from across OST-R and its research community.
  • Wetland Plant Species Composition Influences Site Water Use
    Wetland Plant Species Composition Influences Site Water Use
    Wright, Anna ;
    Sueltenfuss, Jeremy
    2023-10-01 | PDF
    The Colorado Department of Transportation (CDOT) is one of the leading organizations in wetland mitigation within the state of Colorado. In an effort to optimize and prioritize their mitigation activities, and to ensure they do not infringe on Colorado Water Law nor downstream water rights, CDOT was interested in understanding the water use of rest ...
  • Erosion Resistant Rock Shoulder
    Erosion Resistant Rock Shoulder
    Song, Chung R. ;
    Wood, Richard L.
    2023-10-01 | PDF
    Highway shoulder rocks are exposed to continuous erosion force due to unexpected floodings caused by climate change. The evaluation methods of the erosion resistance of highway shoulder rocks are not currently well-developed. This study developed a new large-scale testing device, the University of Nebraska-Lincoln Erosion Testing Bed (UNLETB), whic ...
  • UltraHigh Performance Concrete Reinforced With MultiScale Hybrid Fibers and Its DurabilityRelated Properties Final Report
    Ultra-High Performance Concrete Reinforced With Multi-Scale Hybrid Fibers and Its Durability-Related Properties: Final Report
    Wei, Jianqiang ;
    Breña, Sergio
    2023-10-01 | PDF
    Due to its excellent mechanical properties, dense microstructure, low permeability, ease of placement and volume stability, ultra-high performance concrete (UHPC) is considered the next-generation structural concrete and is increasingly used in transportation infrastructure. While previous research efforts generated valuable results, to achieve the ...
  • Bicycle and Pedestrian Safety Research Project
    Bicycle and Pedestrian Safety Research Project
    Jackson, Steve ;
    Raymond, Paula
    2023-10-01 | PDF
    Crash typing is the process of analyzing crash details to categorize crashes into similar groups, which can help identify hotspots, rising problems, and deploy the most effective countermeasures. This research analyzed crashes involving motor vehicles and bicycles or pedestrians in Idaho between 2012 and 2021. Using the PBCAT2 methodology, with sup ...
  • Investigation of the Impact of Milling and Construction on the Bond Strength of Remaining Thin Scab Layers Summary
    Investigation of the Impact of Milling and Construction on the Bond Strength of Remaining Thin (Scab) Layers [Summary]
    Zou, Jian ;
    Rilko, Wayne
    2023-10-01 | PDF
    Field investigation in Florida indicated that there was a potential link between weakly-bonded scabbed areas and slippage failure in the braking zones. Also, evidence from NCAT test track studies suggested that localized interface debonding might lead to surface cracking under free-rolling traffic. The primary objective of this research was to dete ...
  • Flexural Capacity of Concrete Elements with Unbonded and Bonded Prestressing Summary
    Flexural Capacity of Concrete Elements with Unbonded and Bonded Prestressing [Summary]
    Consolazio, Gary ;
    Potter, William
    2023-10-01 | PDF
    Prestressed concrete is widely used in bridge construction and is considered a cost-effective and efficient method of construction. However, durability issues have arisen which have been attributed to poor grouting practice or material performance. To improve durability and facilitate replacement of tendons, bridge construction projects in Florida ...
  • Evaluation of Software Platforms for Transit Service Planning for Potential Statewide Applications Summary
    Evaluation of Software Platforms for Transit Service Planning for Potential Statewide Applications [Summary]
    Gan, Albert ;
    Matthews, Gabrielle
    2023-10-01 | PDF
    Transit agencies are increasingly using commercially available software platforms to assist in their service planning. These platforms vary in their applications, functionalities, and capabilities, among others. This project includes three focuses: (1) identifies and evaluates existing software platforms used by transit agencies for transit service ...
  • Domestic Airline Fares Consumer Report Second Quarter 2023 Passenger and Fare Information
    Domestic Airline Fares Consumer Report: Second Quarter 2023 Passenger and Fare Information
    United States. Department of Transportation
    2023-10-01 | 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 ...
  • Modernizing Right of Way Maps with Geographic Information System Technology Brief
    Modernizing Right of Way Maps with Geographic Information System Technology [Brief]
    Bunting, Erin L ;
    Fitch, Matt
    2023-10-01 | PDF
    Since the Michigan Department of Transportation (MDOT) began archiving right of way (ROW) maps in the 1940s, MDOT has updated the information technologies it uses for map creation and archival. Past efforts to standardize this archive have revealed the need for a coordinated approach. With the goal of modernizing ROW maps using a geographic informa ...
  • Evaluation of Upgraded Head Restraints FMVSS 202a
    Evaluation of Upgraded Head Restraints: FMVSS 202a
    Díaz, E Acevedo
    2023-10-01 | PDF
    Beginning with vehicle model year 2010, FMVSS 202a established new requirements for head restraints in passenger vehicles. This study evaluates the effectiveness of head restraints in reducing cervical spine injuries, including whiplash injuries, for passenger vehicle occupants using NHTSA’s National Automotive Sampling System Crashworthiness Data ...
  • Traffic Safety Facts 2020 Data Race and Ethnicity
    Traffic Safety Facts 2020 Data: Race and Ethnicity
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2023-10-01 | PDF
    This fact sheet reports data on traffic fatalities by race and ethnicity, which might help develop countermeasures for those at risk. The term “race-ethnicity” is used to refer to the combined classification of race and ethnicity data. Of the 43,230 traffic fatalities in 2021, White people accounted for 50 percent while Black or African American pe ...
  • Traffic Safety Facts 2021 Data Summary of Motor Vehicle Traffic Crashes
    Traffic Safety Facts 2021 Data: Summary of Motor Vehicle Traffic Crashes
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2023-10-01 | PDF
    In 2021 there were an estimated 6,102,936 police-reported traffic crashes in which 42,939 people were killed and an estimated 2,497,657 people were injured. Compared to 2020 this was a 10-percent increase in the number of traffic fatalities, and a 9.4-percent increase in the estimated number of people injured. The estimated number of police-reporte ...
  • Drainage 101 Understanding and Managing Drainage Issues Implementation Summary
    Drainage 101: Understanding and Managing Drainage Issues [Implementation Summary]
    Arvidson, Tim ;
    Bot, Steve
    2023-10-01 | PDF
    This Implementation Summary relations to Report 2023RIC08, published April 2023.
  • Measuring Pavement Density for Sustainable Centerline Joints Summary
    Measuring Pavement Density for Sustainable Centerline Joints [Summary]
    Haider, Syed W. ;
    Eckerd, Naomi
    2023-10-01 | PDF
    This research summary pertains to Report 2023-35, "BMP For Issues with Asphalt Centerline Joint and Intelligent Compaction for Local Agencies," published November 2023.
  • Effectiveness of Contrast Markings on Roadways and Orange Markings in Work Zones
    Effectiveness of Contrast Markings on Roadways and Orange Markings in Work Zones
    Williamson, Michael ;
    Lin, Ping
    2023-10-01 | PDF
    Lane departure crashes are a leading cause of fatalities and injury crashes on roadways. To solve this problem, innovative marking in the form of contrasted white on concrete sections and orange marking in work zones were evaluated for their safety benefits. A highway safety manual approach was taken to evaluate the crash reduction benefits from ea ...
  • Transportation Equity Training for MnDOT Employees
    Transportation Equity Training for MnDOT Employees
    Abdulle, Abdullahi
    2023-10-01 | PDF
    Construction of freeways in the 1960s displaced thousands of homes and businesses as neighborhoods were cut in two or cleared. Primarily Black communities suffered significant economic burden and social impacts. Interstate 35W (I-35W), I-94 and State Highway 55, for example, cut through the Twin Cities in areas that were home to 82% of the city’s B ...
  • Impacts of Highway Improvements on Adjacent Businesses Summary
    Impacts of Highway Improvements on Adjacent Businesses [Summary]
    Zlimen, Kimberly ;
    Fan, Yingling
    2023-10-01 | PDF
    Highway improvements benefit drivers by providing safer roads and increased access to businesses. Business establishments can benefit from increased traffic. Road projects, however, may have negative impacts on some business establishments. Long-standing independent businesses may suffer, for example, as new chain stores move into an area. Further, ...
  • Division of Engineering Research OnCall Roc Agreement 34652 Task 11 Initial Guidance and Recommendations for Climate Informed Science Design Approach
    Division of Engineering Research On-Call (Roc), Agreement #34652. Task 11, Initial Guidance and Recommendations for Climate Informed Science Design Approach
    Bishop, Daniel ;
    Carpenter, Noah
    2023-10-01 | PDF
    A review of climate science reports relevant to extreme precipitation planning for their appropriateness and application to extreme precipitation design was completed for the Ohio Department of Transportation (ODOT) Office of Hydraulic Engineering. The report responds to questions posed by ODOT related to the climate science reports, encompassing a ...
  • Field Load Testing of Shallow Foundations in Florida Limestone Phase II Brief
    Field Load Testing of Shallow Foundations in Florida Limestone: Phase II [Brief]
    Herrera, Rodrigo ;
    Rodgers, Michael B
    2023-10-01 | PDF
    The objectives of this research project were to validate the Phase I bearing capacity equations as well as methods for estimating footing settlement under service and ultimate load states.
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