state route mile long state highway state washington serving southeastern highway travels northeast primarily controlled access freeway intersection interchange interstate federal way cities auburn kent lane rural highway near approaches eastern terminus interchange near cities established state highway renumbering successor branch auburn north bend branch created respectively initial lane highway named completed december opening section later site accidents 1980s gradually widened lane freeway beginning auburn recently finishing highway near interchange remains lane road funded project planned build existing interchange route description begins south street intersection named city highway travels east intersection enchanted parkway carries southwards wild waves theme park city hybrid cloverleaf stack interchange providing access seattle vancouver british_columbia north portland oregon south lane freeway descends diamond interchange located south headquarters exiting canyon freeway enters city auburn intersects signed named valley freeway complex hybrid partial cloverleaf diamond interchange continues east past mixed use trail approaches folded cloverleaf interchange partial cloverleaf interchange auburn way freeway passes exit serving diamond road crossing unincorporated continues northeast southeastern city limits kent interchange freeway intersects diamond interchange street southeast partial cloverleaf interchange leaving intersects diamond interchange located north providing connection freeway travels partial cloverleaf interchange avenue freeway ends northeast partial cloverleaf interchange base lane highway grade intersections remainder route highway travels east provides access reaches eastern terminus diamond interchange located west provides access cities seattle west east traveling roadway continues past interchange parkway city intersecting year conducts series surveys highways state measure traffic volume expressed terms average annual daily traffic aadt measure traffic volume average day year calculated busiest section interchange auburn serving vehicles busiest section highway eastern terminus serving vehicles designated national_highway_system length classifying important national economy defense mobility entire route includes highways connect major communities state washington history modern corridor follows added state highway system branch state road ran main highway auburn state road branch retained state road designated new highway code established branch designated traveling southwest auburn ending junction construction route branch branch began lane highway cost million equivalent million mile long route chosen avoid connect city designated corridor state highway renumbering codified state law replacing branches final miles entrance officially opened december new interchange federal way opened traffic january officially completing expansion lane rural road lane controlled access freeway began response fatalities accidents year period giving highway reputation dangerous roadway widened lanes added new interchanges auburn briefly planned toll new freeway january pay loans construction plan protested local residents rejected months later additional work completed western end freeway extended federal way canyon federal way improved completion interchange improvements federal way triangle planning widen remaining section south near serve capacity funding approved project project widen highway general purpose lanes truck lane lanes traveling summit concrete median barriers separate traffic prevent head collisions compact diamond interchange planned entrance interchange include ramps double roundabout interchange provide access parkway major intersections entire highway
Washington State Route 18