In November 2019, the Washington State Department of Transportation (WSDOT) presented findings from the SR 518 Corridor Planning Study to the Highline Forum in Des Moines, WA. The study, mandated by a 2017 legislative proviso and funded with $500,000 from the legislature plus an additional $400,000 from the Port of Seattle, examined traffic conditions and improvement alternatives along the SR 518 corridor near Sea-Tac Airport. The presentation covered traffic analysis, alternatives screening, and recommended improvement packages, with a final report due by November 30, 2019.Open full document
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A WSDOT presentation delivered at the Highline Forum in Des Moines, WA on November 20, 2019, covering the SR 518 Corridor Planning Study. The study was initiated by a 2017 legislative proviso with $500,000 in funding, supplemented by $400,000 from the Port of Seattle for traffic and modeling work. The presentation outlines study background, practical solutions approach, traffic analysis, alternatives screening, recommended packages, and next steps.