A November 2021 WSDOT presentation outlines the SR 509 Completion Project, part of the broader Puget Sound Gateway Program, which aims to build new highway connections linking the region's ports and distribution centers between 2020 and 2028. The project includes several construction stages covering new expressway segments, interchange improvements at I-5/SR 516, and a Lake to Sound Trail component in the area south of Seattle near Sea-Tac Airport.

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A WSDOT presentation to the Highline Forum on November 17, 2021, providing an overview of the SR 509 Completion Project, part of the Puget Sound Gateway Program. The presentation covers the project timeline, key construction stages including the I-5/SR 516 interchange and expressway segments, and the Lake to Sound Trail. Construction is scheduled from 2020 to 2028.

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As the source for federal transportation grants, the Puget Sound Regional Council was charged with developing a system to meet the growing need for commercial aviation. When the search for a second airport failed, they authorized the Port of Seattle to build the Third Runway, with a mandate to develop a noise abatement and mitigation program. In their effort to stop the Third Runway, the ACC argued over every detail of the Port's efforts--including property buyouts and sound insulation. The dispute was meant to be settled by a three member Expert Arbitration Panel. This is their final report. It finds 2-1, that the Port's program was insufficient in several respects. Despite that, funding for the Third Runway was approved by the PSRC, and the 'Port Package' program, proceeded largely unchanged. Expert Arbitration Panel's final decision finding that the Port of Seattle had not shown sufficient reduction in real on-the-ground noise impacts to satisfy noise reduction conditions required for approval of a third runway at Sea-Tac International Airport. The majority decision concluded the Port's noise abatement programs were insufficient despite being impressive in scope.

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