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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 3861 - 3880 of 36908 results
  • Evaluation of Commercially Available Concrete Bridge Deck Repair Materials
    Evaluation of Commercially Available Concrete Bridge Deck Repair Materials
    Maguire, Marc ;
    Sorensen, Andrew D.
    2021-07-01 | PDF
    Extensive investigation on rapid repair materials for concrete bridge decks is of utmost importance to limit the impact on traveling vehicles as well as selecting suitable materials with acceptable mechanical properties and durability requirements. The objective of this research project is to evaluate eight commercial cementitious rapid repair mate ...
  • A Model for Integrating Rail Services with other Transportation Modalities Identifying the Best Practices and the Gaps for Californias Next State Rail Plan
    A Model for Integrating Rail Services with other Transportation Modalities: Identifying the Best Practices and the Gaps for California’s Next State Rail Plan
    Peterson, Eric ;
    Wei, Wenbin
    2021-07-01 | PDF
    The California State Rail Plan (CSRP) is among the best rail plan documents published by any jurisdiction in the United States to date. As such, the CSRP is used in this paper as the basis of comparison to other state rail service plans. These plans will have been submitted to the Federal Railroad Administration (FRA) on record as of June 2020—as r ...
  • EarlyAge and Premature Cracking in Jointed Plain Concrete Pavements Literature Review
    Early-Age and Premature Cracking in Jointed Plain Concrete Pavements: Literature Review
    Mateos, Angel ;
    Harvey, John T
    2021-07-01 | PDF
    This technical memorandum includes a literature review about the factors that may lead to early-age and premature cracking of jointed plain concrete pavements (JPCPs). The review shows that many factors are involved and that many different circumstances can result in these types of cracking. In most of the cases reported in the literature, the earl ...
  • Geospatial Approaches to Enhancing MPO Community Engagement
    Geospatial Approaches to Enhancing MPO Community Engagement
    Orr, Meghan ;
    Olson, Ben
    2021-07-01 | PDF
    Metropolitan planning organizations are responsible for overseeing urban planning in every major urban region in the country. In recent years the importance of building engagement with constituents to create more equitable and inclusive urban planning models has become a heightened priority. This white paper explored the benefits and best practices ...
  • 2020 Critical Update to Caltrans Wildfire Vulnerability Analysis
    2020 Critical Update to Caltrans Wildfire Vulnerability Analysis
    Thorne, James H. ;
    Boynton, Ryan M
    2021-07-01 | PDF
    Catastrophic wildfires over the past five years (2015-2020) have caused damage to the Caltrans road network in 81 separate wildfire events, leading to expenditures of over $590,000,000 to repair highway assets. To reduce the risk of further wildfire damage and to improve public safety, particularly for disadvantaged communities, Caltrans has engage ...
  • Transportation as a Disease VectorA Modeling Approach
    Transportation as a Disease Vector—A Modeling Approach
    Meitiv, Alexander ;
    Sanchez, Kristen
    2021-07-01 | PDF
    Today’s interconnected world, linked by transportation networks, plays a major role in the spread of a pandemic such as COVID-19. The virus originated in a single community, but due to the global nature of transportation, it spread to other parts of the world, impacting local communities and repeating this cycle many times over. In the context of d ...
  • Effect of Clay Content on AlkaliCarbonate Reactive ACR Dolomitic Limestone
    Effect of Clay Content on Alkali-Carbonate Reactive (ACR) Dolomitic Limestone
    Milla, Jose ;
    Rupnow, Tyson
    2021-07-01 | PDF
    This study aimed to evaluate whether an aggregate’s clay content plays an overarching role in ACR expansion and deterioration within the limestone sources that have been approved for use in portland cement concrete in Louisiana. A total of 29 aggregate sources from the Louisiana Department of Transportation and Development (DOTD) approved materials ...
  • 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 ...
  • 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 ...
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