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State Route 16 (SR 16) is a state highway in the U.S. state of Washington, connecting Pierce and Kitsap counties. The highway, signed as east–west, begins at an interchange with Interstate 5 (I-5) in Tacoma and travels through the city as a freeway towards the Tacoma Narrows. SR 16 crosses the narrows onto the Kitsap Peninsula on the partially tolled Tacoma Narrows Bridge and continues through Gig Harbor and Port Orchard before the freeway ends in Gorst. The designation ends at an intersection with SR 3 southwest of the beginning of its freeway through Bremerton and Poulsbo. SR 16 is designated as a Strategic Highway Network (STRAHNET) corridor within the National Highway System as the main thoroughfare connecting Tacoma to Naval Base Kitsap and a part of the Highways of Statewide Significance program. SR 16 was created during the 1964 state highway renumbering as the successor to Primary State Highway 14 (PSH 14). PSH 14, which had itself been the successor to State Road 14, traveled northeast from Shelton to Gorst and south to Gig Harbor. PSH 14 was extended over the Tacoma Narrows in 1939 on the unfinished Tacoma Narrows Bridge, which would later collapse months after opening in 1940, into Tacoma over Secondary State Highway 14C (SSH 14C). SR 16 has been expanded into a freeway in stages beginning with the original Nalley Valley Viaduct in Tacoma in 1971, and ending with the opening of an interchange near Port Orchard in 2009. Future improvements to the corridor include the installation of high-occupancy vehicle lanes that connect to I-5 and the rest of the freeway network in Pierce County, scheduled for completion by 2022. ==Route description== SR 16 begins on the Nalley Valley Viaduct in Tacoma at an interchange with I-5 between the Tacoma Mall and Downtown. The freeway travels northwest over the Sound Transit Sounder commuter train to a semi-directional T interchange with Sprague Avenue, where it begins paralleling the Scott Pierson Trail. SR 16 continues west past a diamond interchange with Union Avenue and an interchange with Center Street at Cheney Stadium towards the Skyline neighborhood of North Tacoma. The freeway travels around Tacoma Community College past partial cloverleaf interchanges with 19th Street and Pearl Street, the latter being signed as SR 163 as it heads north into Ruston and towards Vashon Island. 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.〔(【引用サイトリンク】url=http://www.wsdot.wa.gov/Projects/SR16/NewNarrowsBridge/Facts.htm )〕 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 passengers and/or a motorcycle are set at $4 for Good To Go! accounts and $6 collected at the toll plaza, with prices increasing for each additional passenger by $2 for Good To Go! accounts and by $2.50 for non-Good To Go! users.〔(【引用サイトリンク】url=http://www.wsdot.wa.gov/Tolling/TNBTolling/default.htm )〕〔(【引用サイトリンク】url=http://www.wsdot.wa.gov/Tolling/TollRates.htm#TNB )〕 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 a Strategic Highway Network corridor, connecting Naval Base Kitsap to the state highway system along with SR 3, within the National Highway System that classifies it as important to the national economy, defense, and mobility. WSDOT designates the entire route of SR 16 as a Highway of Statewide Significance, which includes highways that connect major communities in the state of Washington. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Washington State Route 16」の詳細全文を読む スポンサード リンク
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