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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 2021 - 2040 of 36873 results
  • Utilizing Reclaimed Asphalt Pavement in Preservation Treatments
    Utilizing Reclaimed Asphalt Pavement in Preservation Treatments
    Sayeh, Watheq ;
    Al-Qadi, Imad L
    2023-10-01 | PDF
    The use of reclaimed asphalt pavement (RAP) has economic and environmental impacts. This report investigates the prospective use of RAP in preservation treatments (mainly chip sealing and microsurfacing) in Illinois. A review of the current state of knowledge and practice was conducted. The economic and logistic feasibility of using RAP in preserva ...
  • Evaluation of LargeFormat Metallic Additive Manufacturing AM for Steel Bridge Applications Final Report of Tensile Impact and Fatigue Testing Results
    Evaluation of Large-Format Metallic Additive Manufacturing (AM) for Steel Bridge Applications: Final Report of Tensile, Impact, and Fatigue Testing Results
    Sherman, Ryan J. ;
    Kessler, Hannah D
    2023-10-01 | PDF
    Wire arc additive manufacturing (WAAM) is an additive manufacturing process capable of printing using metallic feedstocks, such as traditional welding wire consumables. Advances in WAAM allow large-scale components, measured on the scale of feet, to be fabricated. A lack of fundamental knowledge of the material and fatigue behaviors of WAAM current ...
  • Evaluation of Roadway HighMast Tower Lighting
    Evaluation of Roadway High-Mast Tower Lighting
    Gibbons, Ronald B ;
    Bhagavathula, Rajaram
    2023-10-01 | PDF
    This study conducted an evaluation of high-mast roadway lighting, which included a review of Illinois Department of Transportation’s high-mast lighting specification and a field experiment. The lighting specification was reviewed for potential cost-saving measures. Recommended changes included the use of an external drive mechanism, a design-by-app ...
  • Drying Shrinkage Response of FullScale Thin Concrete Overlay on Asphalt Sections
    Drying Shrinkage Response of Full-Scale Thin Concrete Overlay on Asphalt Sections
    Mateos, Angel ;
    Harvey, John
    2023-10-01 | PDF
    Moisture-related shrinkage is regarded as one of the phenomena that has the largest impacts on the performance of jointed plain concrete pavements. Still, most mechanistic-empirical design methods oversimplify or ignore predictions of moisture-related shrinkage and its effects on concrete pavements. This study evaluates how moisture-related shrinka ...
  • 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 ...
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