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State Route 99 (SR 99), also known as the Pacific Highway, is a state highway in the Seattle metropolitan area, part of the U.S. state of Washington. It runs 49 miles (79 km) from Fife in the south to Everett in the north, passing through the cities of Federal Way, SeaTac, Seattle, Shoreline, and Lynnwood. The route primarily follows arterial streets, including Aurora Avenue, and has several freeway segments, including the tolled SR 99 Tunnel in Downtown Seattle. SR 99 was officially named the William P. Stewart Memorial Highway by the state legislature in 2016, after a campaign to replace an unofficial moniker honoring Confederate President Jefferson Davis.

SR 99 was originally a section of U.S. Route 99 (US 99), which was once the state's primary north-south highway. US 99 was created in 1926 and replaced earlier local roads that date back to the 1890s and state roads designated as early as 1913. The highway was moved onto the Alaskan Way Viaduct in 1953, replacing a congested stretch through Downtown Seattle, and other sections were built to expressway standards in the 1950s.

US 99 was ultimately replaced by the Tacoma–Everett section of Interstate 5 (I-5), which opened in stages between 1965 and 1969. The route was de-certified in 1969 and SR 99 was created to keep segments of the highway under state control. After decades of crime on some sections of SR 99, various city governments funded projects to beautify the highway and convert it into a boulevard. A section of the highway in Tukwila was transferred to city control in 2004, creating a two-mile (3.2 km) gap in the route between the interchanges of SR 518 and SR 599 https://en.wikipedia.org/wiki/....Washington_State_Rou