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Interstate 80 in Utah
Interstate 80 (I-80) is a part of the Interstate Highway System that runs from San Francisco, California, to Teaneck, New Jersey. The portion of the highway in the U.S. state of Utah is , through the northern part of the state. From west to east, I-80 crosses the state line from Nevada in Tooele County and traverses the Bonneville Salt Flatswhich are a part of the larger Great Salt Lake Desert. It continues alongside the Wendover Cut-offthe corridor of the former Victory HighwayU.S. Route 40 (US-40) and the Western Pacific Railroad Feather River Route. After passing the Oquirrh Mountains, I-80 enters the Salt Lake Valley and Salt Lake County. A short portion of the freeway is concurrent with I-15 through Downtown Salt Lake City. At the Spaghetti Bowl, I-80 turns east again into the mouth of Parley's Canyon and Summit County, travels through the mountain range and intersects the eastern end of I-84 near Echo Reservoir before turning northwest towards the Wyoming border near Evanston. I-80 was built along the corridor of the Lincoln Highway and the Mormon Trail through the Wasatch Range. The easternmost section also follows the historical routes of the First Transcontinental Railroad and US-30S.
Construction of the controlled-access highway began in the 1950s, and by the late 1970s most of the freeway across the state of Utah had been completed. The section of I-80 between Utah State Route 68 (SR-68, Redwood Road) and the Salt Lake City International Airport was the last piece of the nearly freeway to be completed. It was opened on August 22, 1986, and was about from the site of another cross-country milestone in Utah, the driving of the Golden Spike of the First Transcontinental Railroad at Promontory Summit. Average daily traffic volumes in 2012 ranged between 6,765 vehicles using the freeway at SR-58 and 121,205 vehicles using the freeway at the Spaghetti Bowl in Downtown Salt Lake City. Throughout the state, the highway is also known as the Purple Heart Trail.
==Route description==
Out of the eleven states which I-80 passes through, the segment in Utah is the fourth shortest. The longest stretch of I-80 in a single state is the segment in Nebraska.〔 As part of the Interstate Highway System, the entire route is listed on the National Highway System, a system of roads that are important to the nation's economy, defense, and mobility.
Every year, the Utah Department of Transportation (UDOT) conducts a series of surveys on its highways to measure traffic volumes. This measure is expressed in terms of average annual daily traffic (AADT), a measure of traffic volume for any average day of the year. In 2012, UDOT calculated that as few as 6,765 vehicles traveled I-80 at the interchange with SR-58 in Wendover, and as many as 121,205 vehicles used the highway at the Spaghetti Bowl in downtown Salt Lake City. Between seven and 58 percent of the traffic recorded consisted of trucks. These counts are for the portion of the freeway in Utah.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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