This report documents the research activities to investigate the traffic crashes in Rural, Isolated, Tribal, or Indigenous (RITI) communities involving considerable incapacitating injuries and fatalities. The traffic crashes occurring in RITI communities, are different from urban traffic crashes, and are related more to the features like speeding,
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The range of efforts to address climate change can span from international collaboration to personal action. This study looks at environmental efforts at the local jurisdictional level. Over the last decade, cities and counties have released climate action plans (CAPs) to set emissions reduction targets and outline actions that will help meet those
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Transportation remains the largest source of U.S.-based carbon emissions, and reducing emissions from this source continues to challenge experts. Addressing challenging problems requires diverse modes of thinking—and at present the transportation workforce is not diverse in terms of gender, with women occupying only about 14% of the transportation
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The importance of green technologies for generating renewable energy and sustainable development is widely accepted. Road surfaces are exposed to solar radiation that generates thermal gradients and heat flow in the pavement layers. The heat stored can be harvested providing an untapped source of renewable energy. This report presents the design, c
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Early investments in climate change research, policy, and planning focused heavily on climate mitigation—efforts to reduce greenhouse gas emissions. Adaptation initiatives are essential to the resilience of the transportation system in the face of increasingly severe climate threats; the failure to adapt will result in repair and recovery efforts a
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Climate adaptation is now a well-documented need in the transportation sector, and there are strong conceptual frameworks for the adaptation process. Since climate adaptation is an emerging field, the pathways for developing the skills and competencies for adaptation careers are not well established. This white paper assesses the workforce developm
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This report covers the period October 1, 2019 through September 30, 2020. The Center was established by the authority of FAA solicitation 13-C-AJFE-Solicitation. During that time the ASCENT team launched a new website, which can be viewed at ascent.aero. The next meeting will be held virtually April 27-29, 2021.
Total cost of ownership (TCO) studies are generally used as a tool to understand how and when plug-in electric vehicle (PEV) technology will reach cost parity with conventional fuel vehicles. Post cost-parity, the PEV market should be able to sustain without government intervention. The researchers present here a detailed analysis of vehicle manufa
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Clean vehicle adoption is an integral part of strategies in California and other jurisdictions to decarbonize transportation and mitigate climate change via reducing greenhouse gas emissions. However, cost barriers have thus far largely limited adoption of these technologies to more affluent households. Although California has instituted subsidy-ba
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The goals of this project were to use the best available climate change models and data to create more accurate projections of the severity and frequency of extreme precipitation events, and to present these projections in useful, accessible, site-specific formats for hydrologic and engineering applications. Ultimately, the goal was to provide cruc
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For the market introduction of electric vehicles to be successful, first-time adopters need to make continual purchases of the vehicles. Discontinuance, the act of abandoning a new technology after once being an adopter, has implications for market growth and could prevent electric vehicles from ever reaching 100% market share. Using results from f
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The purpose of this project is to measure the magnitude of the pollution reduction co-benefit generated by pricing congestion. In California, despite incentives for the adoption of cleaner vehicles and increased penetration of electric vehicles in the fleet, GHG emissions from transportation continue to increase. And when it comes to local air poll
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Pongamia, a leguminous, oilseed-bearing tree, is a potential resource for renewable fuels in general and sustainable aviation fuel in particular. The present work characterizes physicochemical properties of reproductive materials (seeds and pods) from pongamia trees grown in different environments at five locations on the island of Oahu, Hawaii, US
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Pavement temperature is one of the most important parameters that influence pavement performance. In the Pavement ME Design (PMED) software, the pavement temperatures are determined based on the shortwave radiation (SWR) and longwave radiation (LWR) models. In this project, the accuracy of such radiation models is assessed. The PMED-recommended net
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This Caltrans Climate Change Vulnerability Assessment Statewide Summary provides an overview and synthesis of the 12 district Summary Reports and highlights Caltrans’ planned next steps. Caltrans is taking both top-down and bottom-up approaches to holistically address the climate change hazards and risks posed to the highway network. Advancing thes
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This synthesis provides the practicing engineer with the basic knowledge required to build roadways and airports over permafrost terrain. Topics covered include an overview of permafrost, geotechnical investigations, slope stability, impacts of climate, and adaptation strategies during the design, construction and maintenance phases. The purpose of
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United States. Committee on the Marine Transportation System (CMTS)
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2020-12-01
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PDF
One of the recommendations from the 2017 report “The 2017 Hurricane Season: Recommendations for a Resilient Path Forward for the Marine Transportation System” was to review subsequent hurricane seasons to understand challenges, successes, and adaptations. This report is a follow up to the 2017 hurricane seasons report by comparing the challenges, s
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Transportation planners in coastal communities plan for future hazards and risks of sea-level rise (SLR), and often, they communicate risk in public meetings via PowerPoint presentations with charts as well as two-dimensional (2D) maps that visualize information using Geographic Information Systems (GIS) technologies. This project investigates the
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Climate adaptation is now a well-documented need in the transportation sector and there are strong conceptual frameworks for the adaptation process. Since climate adaptation is an emerging field, the pathways for developing the skills and competencies for adaptation careers are not well-established. This white paper assesses the workforce developme
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Investment risk and uncertainty about the availability of biomass feedstock hinders the development of a mature cellulosic biofuel sector. The Biomass Crop Assistance Program (BCAP) is a federal program designed to subsidize farmers to establish, produce and deliver biomass feedstock to biorefineries. This study evaluated the impacts of BCAP on the
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