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Interstate 84 in Utah
Interstate 84 (I-84) is a part of the Interstate Highway System that links Portland, Oregon to I-80 near Echo, Utah. The segment in the U.S. state of Utah is the shortest of any of the three states the western portion of the Interstate Highway passes through, and contains the eastern terminus of the highway. I-84 enters Box Elder County near Snowville before becoming concurrent with I-15 in Tremonton. The concurrent highways travel south through Brigham City and Ogden and separate near the Ogden-Hinckley Airport. Turing east along the Davis County border, I-84 intersects U.S. Route 89 (US-89) and enters Weber Canyon as well as Morgan County. While in Morgan County, I-84 passes the Devil's Gate-Weber Hydroelectric Power Plant and Devil's Slide rock formation. Past Morgan, the highway crosses into Summit County, past the Thousand Mile Tree before reaching its eastern terminus at I-80 near Echo.
Construction of the controlled-access highway was scheduled in late 1957 under the designations Interstate 82S and Interstate 80N. The I-82S designation was only applied on paper for about a year, but the I-80N designation was the highway's official designation until 1977 when it was renumbered I-84 by the American Association of State Highway and Transportation Officials. By 1978, construction of the freeway had been completed across Utah, as well as Oregon and most of Idaho. I-84 is unusual as there are two noncontiguous segments: Oregon, Idaho, and Utah as well as Pennsylvania, New York, Connecticut, and Massachusetts. Average traffic in 2012, along the non-concurrent parts of I-84, ranged from as few as 6,655 vehicles traveling along I-84 at the interchange with SR-86 in Henefer, and as many as 18,945 vehicles used the highway at the SR-26 interchange in Riverdale.
==Route description==
Out of the three states that the western portion of I-84 passes through, the segment in Utah is the shortest. By comparison, the longest stretch of western I-84 through a single state is the segment in Oregon. I-84 also has a noncontiguous eastern segment that passes through Pennsylvania, New York, Connecticut, and Massachusetts: all four of these segments are shorter than the Utah segment.
Every year, the Utah Department of Transportation (UDOT) conducts a series of surveys on its highways in the state to measure traffic volume. This 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 6,655 vehicles traveled I-84 at the interchange with SR-86 in Henefer, and as many as 18,945 vehicles used the highway at the SR-26 interchange in Riverdale. Between 27 and 57 percent of the traffic recorded consisted of trucks. These counts are of the portion of the freeway in Utah and are not reflective of the entire Interstate, or of its concurrency with I-15. 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.
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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