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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 3401 - 3420 of 35958 results
  • Joint Optimization of School Bus Routes and Lastmile Services
    Joint Optimization of School Bus Routes and Last-mile Services
    Zhang, Peter ;
    Hao, Hao
    2021-07-01 | PDF
    School bus routing across multiple districts requires the coordination of many resources. In this project, the authors plan to understand the challenges in current school bus routing in Allegheny County, Pennsylvania, and improve the mobility of students via decision analytical models and deployment of information technology tools. The main focus i ...
  • The Sidekick Routing Paradigm for VMT Reduction and Improved Accessibility
    The “Sidekick” Routing Paradigm for VMT Reduction and Improved Accessibility
    Carlsson, John Gunnar ;
    Jones, Bo
    2021-07-01 | PDF
    This project has combined tools from geospatial analysis, mathematical optimization theory, and computational geometry to study a routing paradigm that we call sidekick routing. A sidekick routing scheme is a logistical framework in which a large vehicle, such as a truck or van, serves as a mobile base for a fleet of small vehicles (the “sidekicks” ...
  • Influence of the Mount Evans Highway SH 5 on Alpine Wetland Hydrologic Processes Permafrost and Vegetation Colorado Rocky Mountains
    Influence of the Mount Evans Highway (SH 5) on Alpine Wetland Hydrologic Processes, Permafrost, and Vegetation, Colorado Rocky Mountains
    Shaw, Jeremy R. ;
    Cooper, David J.
    2021-07-01 | PDF
    The Mount Evans Highway (SH 5) has been severely damaged by permafrost degradation and freeze-thaw processes. We assessed the effects of the current roadway configuration on the permafrost, hydrologic processes, vegetation, and soils of the Summit Lake Park wetland complex. We also reviewed and synthesized available literature to develop design rec ...
  • Enhanced Assessment of Projected Landslide Activity Under Precipitation and Seismicity
    Enhanced Assessment of Projected Landslide Activity Under Precipitation and Seismicity
    Leshchinsky, Ben A. ;
    Booth, Adam
    2021-07-01 | PDF
    Regional assessments of potential landsliding are useful means of mitigating loss of life, property, and infrastructure, especially when exacerbated by rainfall and seismic events. Susceptibility maps are useful tools for characterizing hazard and risk tied to potential landslides. The method presented herein enables characterization of the area, v ...
  • Steps To Supplement ParkandRide Public Transit Access With RideandRide Shuttles
    Steps To Supplement Park-and-Ride Public Transit Access With Ride-and-Ride Shuttles
    Niles, John S ;
    Pogodzinski, J.M
    2021-07-01 | PDF
    Public transit ridership in California declined in the five years before the pandemic of 2020–21 and dropped significantly further after the pandemic began. A sharp downward step in the level of transit boarding occurred after February 2020, and continues to the date of this report as a result of the public-health guidance on social distancing, exp ...
  • Phase II
    Phase II
    Fukushige, Tatsuya ;
    Fitch, Dillon
    2021-07-01 | PDF
    Dock-less, electric bike-share services offer cities a new transportation option with the potential to improve environmental, social, and health outcomes. But these benefits accrue only if bike-share use replaces car travel. The purpose of this study is to examine factors influencing whether bike-share substitutes for driving and the degree to whic ...
  • Flexible Transit Services
    Flexible Transit Services
    Gonzales, Eric J. ;
    Christofa, Eleni
    2021-07-01 | PDF
    Public transit services in Massachusetts typically operate fixed routes with a published schedule. Fixed routes are not cost effective for serving low density, dispersed demand. The first part of this study is to conduct a theoretical analysis of the various forms of flexible transit service, ranging from deviating routes and schedules to fully dem ...
  • Performance Measurement Management Using Connected Automated Vehicle Data
    Performance Measurement & Management Using Connected & Automated Vehicle Data
    Hadi, Mohammed ;
    Sisiopiku, Virginia
    2021-07-01 | PDF
    The availability of connected vehicle (CV) data, even at lower market penetrations, can be sufficient to support critical transportation performance measurement and management functions. This study developed a framework, methods, and algorithms for using CV data to estimate measures to support agency processes. As such, the study investigated the u ...
  • The Effectiveness of Soil Decompaction for Stormwater Management
    The Effectiveness of Soil Decompaction for Stormwater Management
    Schwartz, Stuart S
    ORCID ICON IMG
    2021-07-01 | PDF
    Compacted and highly disturbed urban soils are a pervasive feature of modern constructed landscapes. This research advances the integration of cost-effective practices that improve soil structure, restore infiltration, and reduce stormwater runoff to support soil decompaction and amendment as an approved stormwater best management practice (BMP) in ...
  • Illinois Experience Using Quality Control for Performance and Pay for Performance To Determine Pay for HotMix Asphalt
    Illinois’ Experience Using Quality Control for Performance and Pay for Performance To Determine Pay for Hot-Mix Asphalt
    Al-Qadi, Imad L ;
    Rivera-Perez, José
    2021-07-01 | PDF
    The study addressed practical concerns and questions regarding QCP and PFP specifications, which reveal the following key outcomes: Contractors have more experience working with QCP projects. Training of contractors on PWL computations used in the PFP specification is warranted. Although pay incentives (PF>100%) are only possible in the PFP specifi ...
  • Determination of Equivalent Single Axle Load ESAL Factor for Georgia Pavement Design
    Determination of Equivalent Single Axle Load (ESAL) Factor for Georgia Pavement Design
    Kim, S. Sonny ;
    Yang, Jidong J
    2021-07-01 | PDF
    The Georgia Department of Transportation (GDOT) is currently using the 1972 AASHTO Pavement Design Guide in which the damage caused by traveling vehicles in the pavement’s design life is defined in terms of equivalent single axle load (ESAL). The last updates of truck ESAL factors in Georgia were made in 1984. Thus, there is a need to update ESAL f ...
  • Road Ditch Line Mapping with Mobile LiDAR
    Road Ditch Line Mapping with Mobile LiDAR
    Habib, Ayman ;
    Bullock, Darcy M.
    2021-07-01 | PDF
    Maintenance of roadside ditches is important to avoid localized flooding and premature failure of pavements. Scheduling effective preventative maintenance requires mapping of the ditch profile to identify areas requiring excavation of long-term sediment accumulation. High-resolution, high-quality point clouds collected by mobile LiDAR mapping syste ...
  • Tensions and TradeOffs in Planning and Policymaking for TransitOriented Development Transit and Active Transport in California Cities
    Tensions and Trade-Offs in Planning and Policymaking for Transit-Oriented Development, Transit, and Active Transport in California Cities
    Barbour, Elisa ;
    Jin, Janet
    2021-07-01 | PDF
    This report provides research findings from the second year of a two-year research project on patterns of local policymaking in California to support transit-oriented development (TOD), transit, and active transport. Through survey research and case studies, the project assessed motivations, perceived obstacles, and priorities for development near ...
  • Statistical Analysis of 2018 HMA Production and Construction Data to Improve Quality Assurance and Acceptance Practices in Idaho
    Statistical Analysis of 2018 HMA Production and Construction Data to Improve Quality Assurance and Acceptance Practices in Idaho
    Sadegh, Mojtaba ;
    Mishra, Deb
    2021-07-01 | PDF
    Quality assurance procedure is adopted to ensure hot mix asphalts meet design performance. Robustness of QA reports, however, were challenged during 2017 and 2018 data reviews conducted on projects constructed over several previous years by the Idaho Transportation Department (ITD) and the Federal Highway Administration (FHWA). To further investiga ...
  • Sunshine Skyway Bridge Monitoring Phase II System Development
    Sunshine Skyway Bridge Monitoring Phase II: System Development
    Bridge, Jennifer ;
    Davis, Justin R.
    2021-07-01 | PDF
    The District 7 Structures Maintenance Office sought to take the existing monitoring components on the Sunshine Skyway Bridge and create a centralized monitoring system available via a web interface and capable of providing alerts for anomalous bridge response data. This project included the selection of a web development contractor, the design of a ...
  • Integrated Corridor Management ICM Concept Exploration for Suffolk County Department of Public Works SCDPW and New York State Department of Transportation NYSDOT Region 10
    Integrated Corridor Management (ICM) Concept Exploration for Suffolk County Department of Public Works (SCDPW) and New York State Department of Transportation (NYSDOT) Region 10
    Muthuswamy, Satya ;
    Brueckner, Paul
    2021-07-01 | PDF
    The focus of this project was to explore the possibility of ICM in Suffolk County, NY. ICM is considered one of the key strategies of Transportation Systems Management and Operation (TSMO), which involves multimodal and multijurisdictional efforts in managing congestion caused by incidents along major commute corridors. As part of this research eff ...
  • Final Analysis of Lightweight Transparent Noise Barriers on I30 Elevated Structures in Dallas Texas
    Final Analysis of Lightweight Transparent Noise Barriers on I-30 Elevated Structures in Dallas, Texas
    Trevino, Manuel
    2021-07-01 | PDF
    The Texas Department of Transportation commissioned a study to analyze the feasibility and effectiveness of lightweight noise barriers on Interstate Highway 30, near downtown Dallas. The highway segment in question, an elevated structure next to a creek, had presented noise problems for the adjacent neighborhood ever since its expansion in the earl ...
  • Performance Benefits of FiberReinforced Thin Concrete Pavement and Overlays
    Performance Benefits of Fiber-Reinforced Thin Concrete Pavement and Overlays
    Barman, Manik ;
    Roy, Souvik
    2021-07-01 | PDF
    This study investigates the performance benefits of synthetic structural fibers in mitigating distresses in thin concrete pavements and overlays. In this study, two ultra-thin (3 and 4 inches thick) and four thin (5 and 6 inches thick) concrete pavements placed on a gravel base along with two thin unbonded concrete overlay cells (5 inches thick) pl ...
  • Domestic Airline Fares Consumer Report First Quarter 2021 Passenger and Fare Information
    Domestic Airline Fares Consumer Report: First Quarter 2021 Passenger and Fare Information
    United States. Department of Transportation
    2021-07-01 | 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 ...
  • Toward a Florida Automated Connected Electric and Shared ACESTransportation System Roadmap Phase I
    Toward a Florida Automated, Connected, Electric, and Shared (ACES)Transportation System Roadmap: Phase I
    Lin, Pei-Sung ;
    Menon, Nikhil
    2021-07-01 | PDF
    Automated, Connected, Electric, and Shared (ACES) technologies are rapidly evolving and will continue to impact development of vehicles, infrastructure, communities, commerce, and the economy. With rapidly evolving technology, it is difficult yet critical to maintain coordination and increase collaboration among research, development, testing, depl ...
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