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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 1541 - 1560 of 35865 results
  • 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.
  • Utilization of UHPC Bridge Superstructures in Texas Volume 2 Structural Analysis Design and FullScale Testing of Precast Pretensioned Girders
    Utilization of UHPC Bridge Superstructures in Texas— Volume 2: Structural Analysis, Design, and Full-Scale Testing of Precast, Pretensioned Girders
    Hueste, Mary Beth D. ;
    Mander, John
    2023-10-01 | PDF
    The use of ultra-high performance concrete (UHPC) in Texas bridges has potential to produce substantial improvements to bridge construction. Advanced material properties and superior durability of UHPC can result in significant design and construction benefits. An analytical feasibility study showed that UHPC bridge girders provide increased design ...
  • Utilization of UHPC Bridge Superstructures in Texas Volume 3 UHPC Production Guidelines and Design Recommendations with Design Examples
    Utilization of UHPC Bridge Superstructures in Texas— Volume 3: UHPC Production Guidelines and Design Recommendations with Design Examples
    Hueste, Mary Beth D. ;
    Mukhopadhyay, Anol
    2023-10-01 | PDF
    The use of ultra-high performance concrete (UHPC) in Texas bridges has the potential to add substantial improvements to bridge construction. Advanced material properties and superior durability of UHPC can result in significant design and construction benefits. Within this context, this project evaluated the application of UHPC for precast, pretens ...
  • District Highway Maintenance Research OnCall ROC Task 4 Best Practices for Using Slag in Chip Seal Treatments
    District Highway Maintenance Research On-Call (ROC) Task 4: Best Practices for Using Slag in Chip Seal Treatments
    Abbas, Ala R. ;
    Nazzal, Munir
    2023-10-01 | PDF
    This research-on-call (ROC) task was conducted to assist the Ohio Department of Transportation (ODOT) in gaining a better understanding of slag materials that can be used as chip seal aggregates and the potential benefits and drawbacks from using these materials with chip seal treatments. An online survey was conducted in this study to gather infor ...
  • District Highway Maintenance Research OnCall Task4 Best Practices for Using Slag in Chip Seal Treatments Fact Sheet
    District Highway Maintenance Research On-Call Task#4 - Best Practices for Using Slag in Chip Seal Treatments [Fact Sheet]
    Abbas, Ala R. ;
    Nazzal, Munir
    2023-10-01 | PDF
    In 2018, the Ohio Department of Transportation (ODOT) District 1 conducted a trial chip seal project in Defiance County on State Route 66 that utilized electric arc furnace (EAF) slag in lieu of the traditional limestone aggregates. The results of this chip seal project have been mixed thus far. There was an increase in the number of windshield bre ...
  • Reevaluating City Speed Limits with Public Safety in Mind Implementation Summary
    Reevaluating City Speed Limits with Public Safety in Mind [Implementation Summary]
    Arvidson, Tim ;
    Manchester, Will
    2023-10-01 | PDF
    A recent legislative change has given Minnesota cities greater authority in establishing lower speed limits on streets in their jurisdiction—a decision that could potentially have positive impacts on public safety, especially pedestrian and bicycle traffic. A recent analysis of speed-setting practices and the effectiveness of speed limit changes re ...
  • Effectively Implementing Machine Learning with Office of Materials Technology Research Summary
    Effectively Implementing Machine Learning with Office of Materials Technology [Research Summary]
    Zhang, Yunfeng
    2023-10-01 | PDF
    Machine learning models provide significant value for planning and asset management purposes by maximizing the usefulness of past data collection for decision-making and policy development. Newer and more powerful machine learning models not available in previous applications and research in highway transportation fields are investigated to address ...
  • Effectively Implementing Machine Learning with Office of Materials Technology
    Effectively Implementing Machine Learning with Office of Materials Technology
    Zhang, Yunfeng ;
    Xu, Jianshu
    2023-10-01 | PDF
    Machine learning models provide significant value for planning and asset management purposes by maximizing the usefulness of past data collection for decision-making and policy development. Newer and more powerful machine learning models not available in previous applications and research in highway transportation fields are investigated to address ...
  • Connected Autonomous Shuttle Supporting Innovation CASSI in Carys Bond Park
    Connected Autonomous Shuttle Supporting Innovation (CASSI) in Cary’s Bond Park
    Searcy, Sarah ;
    Curran, Shelley
    2023-10-01 | PDF
    The North Carolina Department of Transportation (NCDOT) partnered with Cary, NC (Cary) and Beep, Inc. (Beep) to bring a novel-design, all-electric, low-speed automated shuttle to Fred G. Bond Metro Park (Bond Park) in Cary for a 13-week pilot through the Connected Autonomous Shuttle Supporting Innovation (CASSI) program. Beep operated a Navya Auton ...
  • Evaluating and Validating Technology Options for Estimating Transit Vehicle Occupancy in Real Time
    Evaluating and Validating Technology Options for Estimating Transit Vehicle Occupancy in Real Time
    Sun, Yanshuo ;
    Guo, Qianwen
    2023-10-01 | PDF
    The primary goal of this project was to evaluate and validate various technologies for collecting transit vehicle occupancy information in real time. The specific objectives include the following: (1) Identify a list of potential technology alternatives for transit vehicle occupancy estimation by scanning the academic literature, news, and technica ...
  • Identification of Likely Alternative Supplementary Cementitious Materials in California A Review of Supplies Technical Performance in Concrete Economic and Climatic Considerations
    Identification of Likely Alternative Supplementary Cementitious Materials in California: A Review of Supplies, Technical Performance in Concrete, Economic, and Climatic Considerations
    Nassiri, Somayeh ;
    Butt, Ali A
    2023-10-01 | PDF
    This report is a comprehensive review of natural and human-made materials with the potential to reduce cement content in concrete by partially replacing Portland cement or as additives. The review aims to reveal possible source materials as alternative supplementary cementitious materials (ASCMs) to coal-burned fly ash and ground granulated blast f ...
  • Field Evaluation of Wireless Ultrasonic Thickness Measurement with Steel Bridge Members
    Field Evaluation of Wireless Ultrasonic Thickness Measurement with Steel Bridge Members
    Wang, Yang ;
    Otsuki, Yu
    2023-10-01 | PDF
    This report presents the field validation of wireless ultrasonic thickness measurement systems on in-service steel bridges. The objective of this implementation is to demonstrate the feasibility of long-term corrosion monitoring. The developed system utilizes Martlet wireless ultrasonic sensing devices with two specially designed daughterboards: th ...
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