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|direction_b=East |terminus_b= near Dayton |counties=Lincoln, Tillamook, Polk, Yamhill |previous_type=OR |previous_route=11 |next_type=OR |next_route=19 }} Oregon Route 18 is a state highway that runs between the Oregon Coast, near Lincoln City and the Willamette Valley, near Dayton. OR 18 traverses the Salmon River Highway No. 39 of the Oregon state highway system, named after the river alongside its westernmost segments. ==Route description== OR 18 begins (at its western terminus) at a junction with U.S. Route 101, a few miles north of Lincoln City near Otis Junction. From there it winds eastward though the coast range along the Salmon River, past Rose Lodge and through a stand of timber known as the Van Duzer Corridor. Emerging from the coast range, it enters the fringes of the Willamette Valley in the community of Grand Ronde. It is briefly joined by Oregon Route 22 at a location known as Valley Junction, and overlaps OR 22 in a four-mile (6 km) stretch between Grand Ronde and Willamina, at which point OR 22 heads southeast towards Salem and OR 18 continues northeast towards the Portland area. Also in Willamina, a business route veers off to the north to serve the cities of Willamina and Sheridan; east of Sheridan the business route rejoins the mainline. This business loop was the former route and highway until 1957, when the current Oregon Route 18 was built as a bypass. The highway continues northeast on a straight and level course through Willamette Valley farmland, including the community of Bellevue which intersects with Oregon Route 153, until it intersects with Oregon Route 99W just south of McMinnville. In the McMinnville area, OR 99W serves as the primary business route (entering the downtown core) whereas OR 18 is a bypass route. Two interchanges along OR 18 provide access to McMinnville, including Three-Mile Lane, a spur of the highway. Oregon Route 18 provides direct access to the McMinnville Airport and the Evergreen Aviation Museum, home of the Spruce Goose. East of McMinnville, Oregon Route 18 intersects Oregon Route 233, with which it overlaps until its eastern terminus, and Oregon Route 221; the latter near the city of Dayton. It then crosses over the Yamhill River and terminates at a second junction with OR 99W. Typically, commuters continue north on OR 99W into the Portland area. The highway is rather variant in its configuration. For most of its length, the highway is a two-lane undivided highway, with intersections and cross traffic. There are some limited-access stretches in the "bypass" sections (around the Willamina/Sheridan area, and near McMinnville and Dayton), and the occasional interchange in these stretches. In addition, there is a stretch between Willamina and Sheridan where the highway becomes a 4-lane divided expressway. Currently, the route has a rather notorious reputation among motorists in Oregon, with a relatively high number of fatal accidents. The opening of two casinos, one in Grand Ronde and one in Lincoln City, have greatly increased traffic on OR 18. (In addition, the stretch of Oregon Route 99W immediately north of Dayton, through Dundee and Newberg, is a notorious traffic bottleneck.) Portions of Oregon Route 18 have been designated a safety corridor. There are two proposed expansions to the highway. One is a project which would widen Oregon Route 18 to a four-lane expressway in the stretch between Grand Ronde and Willamina; an area where increased volume (largely due to the casino) has caused significant delays. This project is now completed with an overpass that closed down and blocked off a very fatal intersection. The second project is a new bypass around the Newberg-Dundee area intended to alleviate severe congestion that occurs along 99W. This new route will either be an expressway or a freeway. A route number for this latter project has not been published; however, planning documents and maps present it as an extension to Oregon Route 18. Construction on the first section began in June 2013, with the section scheduled for completion in summer 2016. This section will connect Oregon 219 south of Newberg to 99W west of Dundee.〔 The entire bypass is expected to cost $262 million and will have four lanes from the current eastern terminus of Route 18 south of Dundee and Newberg and reconnect to 99W east of Newberg.〔 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「Oregon Route 18」の詳細全文を読む スポンサード リンク
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