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Interstate 15
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===Utah=== {{Main|Interstate 15 in Utah}} I-15 continues through [[Utah]] for {{convert|401|mi|km|0}}. It is the main north–south connection for the state. The highway approximately follows the old alignment of [[U.S. Route 91|US 91]] from [[St. George, Utah|St. George]] to [[Brigham City, Utah|Brigham City]]. The highway passes through the fast-growing [[Utah's Dixie]] region in the southwestern part of the state, which includes [[St. George, Utah|St. George]], [[Cedar City, Utah|Cedar City]], and eventually most of the major cities and suburbs along the [[Wasatch Front]], including [[Provo, Utah|Provo]], [[Orem, Utah|Orem]], [[Sandy, Utah|Sandy]], [[Salt Lake City]], [[Layton, Utah|Layton]], and [[Ogden, Utah|Ogden]]. Near [[Cove Fort, Utah|Cove Fort]], [[Interstate 70 in Utah|I-70]] begins its journey eastward across the country. The Interstate [[Concurrency (road)|merges]] with [[Interstate 80 in Utah|I-80]] for about {{convert|3|mi|km|0}} from [[South Salt Lake, Utah|South Salt Lake]] to just west of [[Downtown Salt Lake City]] and also merges with [[Interstate 84 in Utah|I-84]] from [[Ogden, Utah|Ogden]] to [[Tremonton, Utah|Tremonton]]. Along nearly its entire length through the state, I-15 winds its way along the western edge of a nearly continuous range of mountains (the [[Wasatch Range]] in the northern half of the state). The only exceptions are north of [[Cove Fort, Utah|Cove Fort]] and when it passes between [[Cedar City, Utah|Cedar City]] and St. George, known as the Black Ridge, a transition zone of drastic change in elevation and climate, an area where the eastern [[Great Basin]], [[Colorado Plateau]], and [[Mojave Desert]] converge.
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