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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 1521 - 1540 of 35865 results
  • The Effect of Coefficient of Friction Between Rail Vehicle Wheels and Rail Track on Operation Power Consumption
    The Effect of Coefficient of Friction Between Rail Vehicle Wheels and Rail Track on Operation Power Consumption
    Mahamudin, Nur Shahibrahim ;
    Darsivan, Fadly Jashi
    2023-10-12 | PDF
    The daily cost of rail operation is increasing due to the increase of rail network size. Therefore, reduction in operation power consumption is important to rail operator in order to fully optimize the daily operation cost. Operation power consumption in rail operation can be divided into 80% traction power such as vehicle propulsion system and 20% ...
  • Data Management Mining and Inference for Bridge Monitoring
    Data Management, Mining, and Inference for Bridge Monitoring
    Rizzo, Piervincenzo ;
    Enshaeian, Alireza
    2023-10-04 | PDF
    According to the Federal Highway Administration (FHWA), there are over 600,000 highway bridges in the United States. Nationwide, the performance evaluation of bridges starts with the inspection of the bridge to determine the current condition. Inspections are conducted in accordance with the National Bridge Inspection Standards (NBIS). With more th ...
  • Effect of Longitudinal Joint Construction and Density on Asphalt Pavement Performance Phase I State of the Practice
    Effect of Longitudinal Joint Construction and Density on Asphalt Pavement Performance – Phase I – State of the Practice
    Akentuna, Moses ;
    Salari, Saman
    2023-10-01 | PDF
    The construction of longitudinal joints to specified densities significantly impacts the performance and service life of asphalt pavements. Ensuring proper compaction is essential to creating impermeable joints that can withstand water infiltration, prevent moisture damage, and enhance long-term performance. Various entities, including state depart ...
  • Utilization of UHPC Bridge Superstructures in Texas Volume 1 UHPC Mixture Development and MaterialLevel Experiments
    Utilization of UHPC Bridge Superstructures in Texas— Volume 1: UHPC Mixture Development and Material-Level Experiments
    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 ...
  • Financial Achievability Model Operationalization Case Studies and Analysis Summary
    Financial Achievability Model: Operationalization Case Studies and Analysis [Summary]
    Tuck, Jason ;
    Schriefer, Patricia (Born)
    2023-10-01 | PDF
    In a prior research project (BDK83 977-24), the Financial Achievability Model (FAM) was created for the Florida Department of Transportation Research Center. The Research Center can use the FAM in all phases of research to meet strategic objectives, including demonstrating the potential benefits of proposed projects, allowing for a more cost-effect ...
  • Traffic Safety Evaluation of Pedestrians and Bicyclists at Roundabouts in Minnesota
    Traffic Safety Evaluation of Pedestrians and Bicyclists at Roundabouts in Minnesota
    Wagner, Mark ;
    Leuer, Derek
    2023-10-01 | PDF
    By the end of 2022, nearly 450 roundabouts were installed on Minnesota roadways. An evaluation of traffic safety at roundabouts published by MnDOT in 2017 showed substantial decreases in fatal and serious injury crashes for all users at intersections after installation of a roundabout. The safety effects of roundabouts are largely due to geometric ...
  • Adapting Asphalt Mixtures for Tougher Rural Roads Summary
    Adapting Asphalt Mixtures for Tougher Rural Roads [Summary]
    Ulring, Joel D ;
    Barman, Manik
    2023-10-01 | PDF
    Seasonal and daily temperature variations, freeze-thaw cycles and other environmental factors lead to pavement distress on low-volume rural roads. Modifying asphalt mixtures could improve pavement resistance to these environmentally driven distresses. A comparison of the mechanical properties and performances of selected asphalt mixtures identified ...
  • FieldCuring Methods for Evaluating the Strength of Concrete Test Specimens
    Field-Curing Methods for Evaluating the Strength of Concrete Test Specimens
    Solanki, Pranshoo ;
    Xie, Haiyan (Sally)
    2023-10-01 | PDF
    The American Association of State Highway and Transportation Officials R 100 standard provides instructions for making and curing concrete test specimens in the field. However, further research is needed to compare the strength of the field-cured specimen with the strength of the actual in-place concrete item. The purpose of this combined laborator ...
  • 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 ...
  • 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 ...
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