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State Route 14 (SR 14) is a state highway in the U.S. state of Washington. The highway travels east-west on the north side of the Columbia River, opposite Interstate 84 (I-84) to the south in Oregon. SR 14 forms a section of the Lewis and Clark Trail Scenic Byway and begins at an interchange with I-5 in Vancouver. The highway travels east as a four-lane freeway through Camas and Washougal and intersects I-205. SR 14 continues east as a two-lane highway through Clark, Skamania, Klickitat, and Benton counties before it ends at an interchange with I-82 and U.S. Route 395 (US 395) near Plymouth. SR 14 was established in 1968 as the successor to US 830, created in 1926 with the original United States Numbered Highways, and Primary State Highway 8 (PSH 8). PSH 8 was added to the state highway system in 1905 as a short road along the Columbia River between Washougal and Lyle and was extended westwards to Vancouver and eastwards to Maryhill by 1913. PSH 8, designated as the Evergreen Highway, was extended east to the Tri-Cities in 1949 and this section was retained during the 1964 state highway renumbering and the decommissioning of US 830. ==Route description== SR 14 begins as a continuation of the Lewis and Clark Trail Scenic Byway in downtown Vancouver at a partial cloverleaf interchange with I-5, Washington Street, and C Street, located on the first exit on I-5 north of the Interstate Bridge, which provides access to Portland, Oregon. The four-lane freeway travels eastward, between the Columbia River and the Seattle Subdivision of the BNSF Northern Transcon route to the south and Pearson Field to the north, and intersects Southeast Columbia Way in a single-point urban interchange, providing access to the Vancouver National Historic Reserve Historic District. SR 14 continues southeast through suburban Vancouver, intersecting Riverside Drive in a partial cloverleaf interchange, Lieser Road in a diamond interchange, and Ellsworth Avenue in a partial diamond interchange, before reaching a partial cloverleaf interchange with I-205 north of the Glenn L. Jackson Memorial Bridge, providing access to eastern suburbs of Portland. SR 14 travels east through an interchange with Southeast 164th Avenue before leaving Vancouver, heading towards Camas. The freeway intersects Southeast 192nd Avenue in unincorporated Clark County before entering the city of Camas at an interchange with its business route on 6th Avenue. SR 14 narrows to two lanes on Lady Island and enters downtown Camas after crossing the Camas Slough. The highway serves as a four-lane freeway bypass of Camas and travels through two partial double roundabout interchanges with SR 500, which travels northwestward to Orchards, and 2nd Street in Washougal. SR 14 continues east past the Steigerwald Lake, Franz Lake, and Pierce national wildlife refuges, all located within Columbia River Gorge National Scenic Area in Clark and Skamania counties. The highway also passes the Bonneville Dam in North Bonneville and the Bridge of the Gods before reaching Stevenson, the county seat of Skamania County. SR 14 leaves Stevenson traveling eastwards through the community of Carson River Valley and a series of tunnels along the Columbia River before crossing over the White Salmon River into Klickitat County near Underwood.〔〔 The highway intersects SR 141 Spur and the Hood River Bridge, unsigned SR 35, before reaching the cities of White Salmon and Bingen, where it passes the local Amtrak station and travels through a junction with SR 141. SR 14 continues east and crosses the Klickitat River into Lyle and forms the southern terminus of SR 142, which travels northeast towards Goldendale. The highway travels east to a junction with US 197 near Dallesport and to Wishram, passing its Amtrak station. SR 14 leaves the Columbia River Gorge National Scenic Area west of Maryhill, where the highway intersects its spur route and US 97, forming a short concurrency with the latter. SR 14 continues northeast along the Columbia Hills and the Columbia River into Benton County, reaching a junction with SR 221 in Paterson. The highway ends at a diamond interchange with I-82 and US 395 northeast of Plymouth, located north of the Umatilla Bridge.〔〔 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 14 was east of its interchange with I-205 in Vancouver, serving 72,000 vehicles, while the least busiest section of the highway was in Maryhill, serving 500 vehicles. SR 14 between Vancouver and Maryhill is designated as part of the National Highway System for its whole length, classifying it as important to the national economy, defense, and mobility. WSDOT designates the same corridor 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 14」の詳細全文を読む スポンサード リンク
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