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Welcome to the Puget Sound Gateway Program's "SR 509 Completion Project". This Project runs from the SR 509 interchange at South 160th Street, in Burien, to the I-5 interchange at South 272nd Street, in Federal Way. The purpose of this project is to ease congestion on I-5 near Tukwila, add a southern access point to the Sea-Tac International Airport, and improve travel between industrial districts for general purpose traffic and trucks. This will be accomplished by building a new, four-lane, three-mile long "SR 509 Expressway" to bypass I-5, SR 99, and local streets.
Learn more on our SR 509 Completion Project’s webpage: wsdot.wa.gov/construction-pla...