the Vashon Island ferry. SR 16 continues west past a partial cloverleaf interchange with Jackson Avenue and towards the Tacoma Narrows on the twin-suspension Tacoma Narrows Bridges. The westbound span and the tolled eastbound span combine to carry six lanes of SR 16 onto the Kitsap Peninsula. The eastbound span is tolled via electronic toll collection through the "Good to Go" program on the Kitsap Peninsula side of the bridge. Tolls for two axle vehicles and motorcycles are set at $5 for Good to Go accounts, $6 collected at the toll plaza, and $7 for Pay by Mail, with prices increasing for each additional axle by $2.50 for Good to Go accounts, $3 for toll plaza users, and $3.50 for Pay by Mail users. SR 16 continues onto the Kitsap Peninsula and intersects 24th Street in a partial diamond interchange east of the Tacoma Narrows Airport as it passes the toll plaza for the eastbound Tacoma Narrows Bridge. The freeway travels northwest through Gig Harbor past interchanges with Olympic Drive and Wollochet Drive near Gig Harbor High School before it reaches Henderson Bay. SR 16 continues through an interchange with Burnham Drive and past the Washington Corrections Center for Women and St. Anthony Hospital towards Purdy, intersecting the southern terminus of SR 302. The freeway bypasses Purdy and Peninsula High School to the east before intersecting SR 302 Spur and entering Kitsap County. SR 16 passes the community of Burley and intersects its main access highway, Burley-Olalla Road, in an interchange before entering the city of Port Orchard. The freeway ends after serving as the western terminus of SR 160 and SR 166 on the west side of the city. The four-lane highway continues west along the Sinclair Inlet into Gorst, intersecting its spur route and ending at an intersection with SR 3. Every year, the Washington State Department of Transportation (WSDOT) conducts a series of surveys on its highways in the state to measure traffic volume. This is expressed in terms of average annual daily traffic (AADT), which is a measure of traffic volume for any average day of the year. In 2012, WSDOT calculated that the busiest section of SR 16 was west of its interchange with Union Avenue in downtown Tacoma, serving 112,000 vehicles, while the least busiest section is after the SR 160 interchange west of Port Orchard, serving 32,000 vehicles. SR 16 is designated as