state route mile long state highway state washington connecting seattle highway travels north interstate south downtown seattle serves cities west seattle international airport south including national_highway_system limited access highway near port northern terminus seattle prior highway renumbering highway seattle aligned freeway bypass coinciding opening interchange cable stayed 21st street bridge proposals recommended building freeway extension city connecting freeway remains route description begins south 21st street single point urban interchange downtown providing access campus link light rail line pacific avenue highway travels east cable stayed 21st street bridge port lane limited access highway intersecting portland avenue half diamond interchange crossing continues east parallel rail line partial cloverleaf interchange port road divided highway ends highway turns northwest marine view drive neighborhood northeast point passes state park city highway travels east dash point road federal way past high schools junction west concurrent travel north intersection western kent turns west form concurrency heading past ends continues north marine view drive city highway turns southeast trumpet interchange southern terminus limited access freeway section lane freeway travels west seattle international airport closed half diamond interchange partial cloverleaf interchange south street entering city passes reaching partial cloverleaf interchange southwest street western terminus freeway continues north neighborhood seattle intersects diamond interchange south street half diamond interchange enters seattle heads interchange street way ending partial cloverleaf interchange south avenue south bridge roadway continues north divided highway downtown seattle way year conducts series surveys highways state measure traffic volume expressed terms annual average daily traffic aadt measure traffic volume average day year calculated busiest section limited access highway northern terminus seattle serving vehicles busiest section dash point dash point state park serving vehicles seattle designated national_highway_system includes roadways important national economy defense mobility highway seattle designated includes highways connect major communities state washington history present route seattle roughly follows wagon road constructed late 1890s highway federal way kent codified state road primary state highway creation primary secondary state highways highway designated highway seattle designated traveled miles north port 11th street bridge blair bridge opened respectively ending intersection traveled miles south avenue south bridge seattle east midway highways combined highway renumbering codified law realigned newly constructed north south freeway extending seattle highway originally routed marine view drive moved freeway planned extended south 1970s mile right way acquired project canceled recommended extending southeast construction planned begin estimated cost million raised billion decade later freeway bypass port opened highway truncated current southern terminus single point urban interchange downtown near 21st street bridge major revisions route occurred proposing freeway extension interchange improvements new arterial streets major intersections
Washington State Route 509