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Interstate 380 (I-380) is a short 1.7-mile (2.7 km) east–west spur Interstate Highway in the San Francisco Bay Area of Northern California, connecting Interstate 280 in San Bruno to U.S. Route 101 near the San Francisco International Airport (SFO). The highway primarily consists of only three intersections: I-280, El Camino Real (State Route 82), and U.S. 101. Like nearby I-280, I-380 never connects to Interstate 80, its parent Interstate Highway. However, there is no rule that says that spur routes need to. (Similarly, the spur route Interstate 795 branches off from Interstate 695, a beltway around Baltimore, and is only indirectly linked to Interstate 95.) I-380 is officially known as the Quentin L. Kopp Freeway, named after the prominent Calif. State Senator from San Mateo County. This highway was previously named the Portola Freeway to honor the eighteenth-century Spanish explorer Gaspar de Portolá, whose expedition in 1769-70 discovered the San Francisco Bay, from a viewpoint on the Sweeney Ridge located between San Bruno and Pacifica. Interstate 380 is part of the California Freeway and Expressway System. ==Route description== I-380 begins at a junction with I-280 in San Bruno. This junction is really only partially built, allowing room to build a proposed freeway extension west towards State Route 1 (''see below''). I-380 then travels east through the City of San Bruno, intersecting with State Route 82, El Camino Real, before reaching US 101. At its terminus at US 101, the mainline lanes of I-380 continue to North Access Road. Meanwhile, the ramps to and from southbound US 101 provide connections to collector/distributor roads leading directly to San Francisco International Airport, allowing traffic between the Interstate and the airport to avoid merging with the main traffic lanes of US Highway 101. 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「Interstate 380 (California)」の詳細全文を読む スポンサード リンク
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