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This study was designed to improve the experience of users of Long-Term Pavement Performance (LTPP) data by enhancing the traffic data included in the LTPP database and making it easier for researchers to find and select the traffic data they need for their specific analyses. ... Read More about Facilitating Analysts’ Use of Traffic Data from the Long-Term Pavement Performance (LTPP) Program | |
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Shotcrete, concrete applied pneumatically at high velocity, has the potential to save costs and construction time when used to replace cast-in-place concrete for retaining walls and slope stabilization. It is becoming popular for vertical and overhead applications where conventional formwork and repairs are difficult and costly. The results of this project will be helpful to highway agencies in achieving the best structural quality and durability when shotcrete is used. ... Read More about Long-Term Bond Characteristics of the Interface Between the Substrate and Overlay in Shotcrete Applications, Phase III | |
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The Cascadia Subduction Zone is capable of producing large-magnitude, megathrust earthquakes that will affect the performance of every new and existing bridge in the western half of Washington state. This project evaluated the impacts on bridges of a magnitude 9 (M9) earthquake to help agencies prioritize earthquake retrofit efforts and to support the development of emergency response plans. ... Read More about Impacts of Cascadia Subduction Zone M9 Earthquakes on Bridges in Washington State: Single-Degree-of-Freedom (SDOF) Idealized Bridges | |
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The 2022 Seattle Commute Study captured insights into Seattle area commuter trip choices and motivators, as well as origins and destinations. The results give transportation planners a clearer picture of travel trends in relation to demographic groups, employment types, and housing. ... Read More about 2022 Seattle Commute Survey | |
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This project conducted a statewide community outreach effort designed to inform the Washington State Department of Transportation (WSDOT) about the transportation spending priorities of state residents as part of WSDOT’s update of the Highway System Plan. ... Read More about Community Engagement Support for the Highway System Plan Update | |
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In March 2020, coinciding with shutdowns caused by the COVID-19 pandemic, the West Seattle Bridge, the main bridge connecting West Seattle with the rest of the city of Seattle, was closed to traffic because of structural deterioration. The unexpected closure of the bridge disrupted passenger and freight mobility to/from West Seattle, increasing travel times and generating bottlenecks on the remaining bridges. This project documented the impacts of the closure on freight flow in and out of West Seattle. ... Read More about West Seattle Bridge Case Study | |
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During roadway construction, transportation agencies frequently unearth industrial soil contamination that threatens both public health and the environment. Management of such compounds to meet environmental regulations can cause construction delays and increase costs. For this study, the researchers sought to develop an accelerated in situ treatment approach adaptable for use at any construction site to cost-effectively remove high-molecular-weight polycyclic aromatic hydrocarbons and metals from clayey soil. ... Read More about Bench-Scale Electrochemical Treatment of Co-contaminated Clayey Soil | |
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During roadway construction, transportation agencies frequently encounter soils containing inorganic compounds that can pose a threat to human health and the environment. Management of such compounds to meet environmental regulations can cause construction delays and increase costs. The researchers in this study sought to develop an accelerated in situ electrochemical treatment for extracting inorganic compounds from fine-grained soils. ... Read More about Evaluation of Electrochemical Treatment for Removal of Arsenic and Manganese from Field Soil | |
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The Final 50 Feet Research Program focuses on the “final 50 feet” of the urban goods delivery system, including searching for parking; loading/unloading; maneuvering intersections, curbs, and other obstacles; and delivering goods to customers. Researchers have used a systems engineering approach to investigate solutions to optimizing delivery operations in the final 50 feet of the supply chain. They have analyzed both the street network and the city’s vertical space as one integrated goods delivery system to ultimately reduce carbon emissions and increase curb efficiency for goods delivery. ... Read More about Final 50 Feet: Urban Goods Delivery Systems | |
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The use of recycled asphalt pavement (RAP) is a sustainable practice that potentially could help reduce construction costs, preserve the environment, and reduce greenhouse gas emissions, provided that the engineering performance of the roadways constructed with RAP is not compromised. This project sought to determine the limits for using RAP as a roadway embankment material and to develop draft specifications for the required material and its placement. ... Read More about Utility and Limitations of Using Recycled Asphalt Pavement (RAP) as Roadway Embankment Material | |
