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Interstate 15 (I-15) is a major Interstate Highway in the western United States. I-15 begins near the Mexican border in San Diego County and stretches north to Alberta, Canada, passing through the states of California, Nevada, Arizona, Utah, Idaho, and Montana. The interstate serves the cities of San Diego, Las Vegas, St. George, Salt Lake City, Pocatello and Butte. It also passes close to the urban areas of Orange County, California, Los Angeles County, California, Ogden, Utah, and Helena, Montana. The stretches of Interstate 15 in Idaho, Utah, and Arizona have been designated as the "Veterans Memorial Highway".〔(【引用サイトリンク】Utah@Rocky Mountain Roads - Interstate 15 )〕 Since the creation of Interstate 15, it has served as a long-haul route for North American commerce. It is now officially chartered for this purpose. From the junction of Interstate 515 in Las Vegas to the Canadian border, I-15 forms part of the CANAMEX Corridor, a High Priority Corridor, as a result of the North American Free Trade Agreement.〔(【引用サイトリンク】CANAMEX CORRIDOR, The safe, smart and secure corridor )〕 Local portions were built to connect the Inland Empire with San Diego in California, facilitate tourism access to Las Vegas, interconnect all of the Metropolitan Statistical Areas in Utah except for Logan, and provide freeway bypasses for Pocatello, Idaho Falls, and Great Falls. Since the construction of Interstate 15, California, Nevada, and Utah have consistently ranked in the fastest-growing areas of the United States. As a result, the route of I-15 has substantially increased in population and commuter traffic has increased the traffic burden on the freeway. Current population estimates are that more than 75 percent of the population of Utah,〔(【引用サイトリンク】Population-Visitor Center- Utah.com )〕 19 percent of the population of California, and more than 70 percent of the population of Nevada live in counties where Interstate 15 is the primary Interstate Highway. Similarly, in California, Interstate 15 is seeing more commuter traffic due to the growth of the Mojave Desert communities of Hesperia and Barstow. In Utah, I-15 has been near-constantly upgraded in the Wasatch Front, and future plans released by the Utah Department of Transportation (UDOT) indicate that this will continue in the north ''and'' the far south of the state as well, due to the extremely rapid growth of Washington County and surrounding areas. In like manner, Las Vegas in Nevada has seen growth along I-15, and in all of the states that it currently serves, it has recently been or is currently in the process of being upgraded to increase capacity and efficiency.〔(【引用サイトリンク】Utah Department of Transportation, Projects Under Construction )〕〔(【引用サイトリンク】District 1 Construction Report )〕〔(【引用サイトリンク】Interstate 15 Major Improvements )〕 The portions in Arizona, Idaho and Montana have retained their rural, long-haul character. Although Arizona has also grown substantially since the construction of I-15, this highway serves only the isolated corner of northwestern Arizona. Due to this rapid area growth, the I-15 corridor is the focus of several mass transit projects. The Las Vegas Monorail, ''FrontRunner'' commuter rail system and TRAX light rail in Salt Lake City are mass transit lines loosely parallel to I-15 that are now in operation. Between Los Angeles and Las Vegas has long been proposed as a maglev train route; in 2004 the California-Nevada Interstate Maglev project held public meetings on the plan.〔(【引用サイトリンク】url = http://www.progressiverailroading.com/transitnews/article.asp?id=4809 )〕 ==Route description== |- |CA |287.26〔 |462.30 |- |NV |123.77〔 |199.19 |- |AZ |29.39〔 |47.30 |- |UT |401.07〔 |645.46 |- |ID |196.00〔 |315.43 |- |MT |396.03〔 |637.35 |- |Total |1,433.52〔 |2,307.03 |} This highway's southern terminus is in San Diego, California, at Interstate 8, although via California State Route 15, a southern extension of the freeway, the route connects to Interstate 5 just north of the Mexican border.〔(【引用サイトリンク】Caltrans">date=December 2010 )〕 The northern terminus is in Sweet Grass, Montana, at the international border between the United States and Canada, where it becomes Alberta Highway 4. It is long from San Diego to Sweet Grass. 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 15」の詳細全文を読む スポンサード リンク
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