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Interstate 215 (I-215), also known locally as the ''belt route'' or ''two-fifteen'', is an auxiliary interstate in the U.S. state of Utah that forms a 270-degree loop around Salt Lake City and many of its suburbs. The route begins at the mouth of Parley's Canyon at the junction of I-80 and heads south through the edge of the Salt Lake City metropolitan area's eastern suburbs of Millcreek, Holladay, and Cottonwood Heights. It continues west through Murray before turning north again, passing through the city's first-ring western suburbs of Taylorsville and West Valley City. It then enters North Salt Lake and Davis County for a short distance before reaching I-15. The interstate was proposed in the mid-1950s, along with I-15 and I-80 through Salt Lake City. At the time, only the western portion of the belt route was assigned as I-215. The eastern portion of the belt route was designated ''Interstate 415''. However, the I-415 designation was scrapped to provide a single route number for the entire route in 1969, with the I-215 designation covering the complete belt route. The freeway was constructed in segments, beginning with a section completed in 1963 from Redwood Road in North Salt Lake to 2100 North near the airport. Originally planned to be complete in the mid-1970s, challenges from citizens' groups over environmental impact statements led to the completion of the last section of I-215 in 1989 between 6200 South and 4500 South in Holladay. ==Route description== I-215 begins at an interchange at the mouth of Parley's Canyon in Millcreek near the southeast corner of Salt Lake City that connects I-80, Foothill Drive (State Route 186, or SR-186) and Parleys Way. At this point, I-215 splits into three legs, connecting I-80 toward Salt Lake City, Foothill Drive and Parleys Way, and I-80 through Parley's Canyon. From here, the freeway travels southeast along the Salt Lake Valley's east bench with three lanes in each direction. The route enters a residential area of East Millcreek and turns south. Then, the first exit appears, an incomplete diamond interchange with 3300 South (SR-171) that lacks an off-ramp from northbound I-215. Past this interchange, an on-ramp connects 3800 South to northbound I-215. A block further south is a partial interchange lacking an off-ramp from northbound I-215 onto 3900 South. Entering Holladay, I-215 is heading south but soon turns southwest. An off-ramp here allows northbound motorists to connect to Wasatch Boulevard. However, this exit is signed as 3900 South and 3300 South because of the incomplete interchanges on both roads. Past an interchange at 4500 South (SR-266) that serves southbound I-215, the road turns south again and begins descending toward Knudsen's Corner and Cottonwood Heights. At this point, the southbound lanes are lower than the parallel northbound lanes. The belt route flattens out upon reaching an interchange at 6200 South at Knudsen's Corner. As the freeway enters Cottonwood Heights, it turns west and becomes a sunken freeway. Then it reaches an interchange at Highland Drive, signed as 2000 East (SR-152). This interchange features a grade-separated ramp from northbound 2000 East to eastbound I-215. Past this junction, another interchange at Union Park Avenue appears. Another grade-separated ramp from Union Park Avenue is present. The freeway enters Murray as an interchange serving westbound motorists connects to 280 East and State Street (U.S. Route 89, or US-89). Eastbound travelers connect to State Street further west at a separate exit. The road turns northwest for a short time to approach a junction at I-15. Approaching the interchange, the route gains two lanes and reverts to a ground-level freeway. The freeway crosses I-15 and loses one lane as it enters Taylorsville and curves to the northwest, crossing the Jordan River in the process. Right before a partial cloverleaf interchange at Redwood Road (SR-68) the route turns west one final time before turning north after the interchange. The freeway continues north and has another partial cloverleaf interchange at 4700 South (SR-266). The route enters West Valley City and encounters 3500 South (SR-171), where its eastbound lanes have a grade-separated ramp to northbound I-215. The road turns northeast and enters an industrial area of western Salt Lake City. After reaching a cloverleaf interchange at SR-201, the route turns north again. Beyond a single-point urban interchange at California Avenue, the freeway continues north.〔 A partial stack interchange involving I-80, Redwood Road, and the access road to Salt Lake City International Airport is next. The freeway loses one lane in each direction as the interstate passes the airport to the east. Two diamond interchanges at 700 North and 2100 North occur as the freeway approaches Davis County. Past 2100 North, the freeway enters rural Salt Lake County, and the road curves to the northwest. An interchange at Legacy Parkway gives northbound I-215 motorists and southbound Legacy Parkway motorists their respective connections. The road turns east and loses one lane in each direction. There is a diamond interchange at SR-68 before the highway merges into northbound I-15 in North Salt Lake.〔 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 215 (Utah)」の詳細全文を読む スポンサード リンク
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