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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 1661 - 1680 of 36104 results
  • Impact of IncentiveDisincentive Specifications on LongTerm Asphalt Pavement Performance Summary
    Impact of Incentive/Disincentive Specifications on Long-Term Asphalt Pavement Performance [Summary]
    Lee, Hyung S ;
    Choubane, Bouzid
    2023-10-01 | PDF
    FDOT’s Percent Within Limits (PWL) specification for acceptance and payment of asphalt materials was first implemented in 2002. The objective of this study was to determine the level of impact that FDOT’s PWL specification has on the long-term performance of asphalt pavements. To meet this objective, Multinomial Logistic Regression Analyses (MLRA) ...
  • Stocktons Crosstown Freeway Urban Renewal and Asian Americans Systemic Causes and Impacts
    Stockton’s Crosstown Freeway, Urban Renewal, and Asian Americans: Systemic Causes and Impacts
    Ong, Paul M. ;
    Pech, Chhandara
    2023-10-01 | PDF
    This project uses mixed methods to examine the systemic causes and consequences of the construction of Stockton, California’s Crosstown Freeway and of urban redevelopment for Asian Americans communities. Stockton underwent spatial restructuring in the decades after the Second World War, and state and local government contributed and responded to th ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Estimating Soil Pressure Against Unyielding Surfaces Summary
    Estimating Soil Pressure Against Unyielding Surfaces [Summary]
    Herrera, Rodrigo ;
    Rodgers, Michael
    2023-10-01 | PDF
    The objectives of this research were to construct a full-scale MSE wall with an unyielding condition and measure the resulting internal earth pressures. In particular, the goal of the project was to determine whether design should be conducted under assumed at-rest conditions, or somewhere between at-rest and passive pressure.
  • BioMaterial Maintenance Treatments
    Bio-Material Maintenance Treatments
    Williams, R Christopher ;
    Rodrigues, Ana Luiza
    2023-10-01 | PDF
    Asphalt pavements deteriorate from temperature cycling, moisture, oxidation, and loading-related distresses. Pavement preservation is critical in maintaining the functional and structural integrity of roads and extending pavement life. Surface treatments can prevent or restore the aging effects by rejuvenating and/or sealing the pavement’s surface, ...
  • Synthesis Study Quantifying the Effect of UHPC Fiber Dispersion and Orientation in Structural Members Summary
    Synthesis Study Quantifying the Effect of UHPC Fiber Dispersion and Orientation in Structural Members [Summary]
    Freeman, Christina ;
    Zhang, Qian
    2023-10-01 | PDF
    The objectives of this research were to synthesize decades of research and practicum surrounding fiber orientation factors for UHPC and analyze the rationale behind the standards set for UHPC design by several countries that have implemented guidelines for its use.
  • 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 ...
  • 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 ...
  • 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 ...
  • 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.
  • 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, ...
  • OriginDestination Vehicle Counts in Weaving Area Utilizing Existing Field Data
    Origin-Destination Vehicle Counts in Weaving Area Utilizing Existing Field Data
    Chien, Stanley ;
    Christopher, Lauren
    2023-10-01 | PDF
    Vehicle weaving describes the vehicle lane changes in areas between consecutive merge and diverge ramp junctions. During heavy traffic, vehicle weaving will slow down traffic, cause congestion, and increase the possibility of crashes. It is desirable to automatically capture the weaving information using camera videos in the weaving areas. The curr ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
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