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Ontario Freeway : ウィキペディア英語版
Interstate 15 in California

|map=California Interstate 15.svg
|length_mi=293.64
|length_round=2
|length_ref=〔Millage is the entire route, including both SR 15 and I-15〕
|established=1957
|direction_a=South
|terminus_a= in San Diego
|junction= in San Diego
in San Diego
in Murrieta
in Ontario
in Rancho Cucamonga
in San Bernardino
in Barstow
in Barstow
|direction_b=North
|terminus_b= at Nevada state line
|previous_type=SR
|previous_route=14
|next_type=SR
|next_route=16
}}
Route 15, consisting of the contiguous segments of State Route 15 (SR 15) joined by Interstate 15 (I-15), is a major north–south state highway in the U.S. state of California, connecting San Bernardino, Riverside, and San Diego Counties. The route consists of the southernmost of I-15, a major Interstate Highway that extends north through Nevada, Arizona, Utah, Idaho, and Montana to the Canadian border. It is a major thoroughfare for traffic between San Diego and the Inland Empire, as well as between Southern California, Las Vegas, Nevada, and points beyond.
South of its junction at Interstate 8 in San Diego, the highway becomes SR 15, extending 〔 to Interstate 5, about from the Mexican border. This segment was initially signed as a state route instead of an Interstate, but it is being upgraded to Interstate standards so it would become part of I-15 in the future. Including this segment, the entire length of Route 15 is .〔
Interstate 15 has portions designated as the Escondido Freeway, Avocado Highway, Temecula Valley Freeway, Ontario Freeway, Barstow Freeway, CHP Officer Larry L. Wetterling and San Bernardino County Sheriff's Lieutenant Alfred E. Stewart Memorial Highway, or Mojave Freeway.
==Route description==

SR 15 is part of the California Freeway and Expressway System. SR 15 begins south of I-5 at 32nd Street near Harbor Drive. After this, SR 15 has an interchange with SR 94,〔 which has been cited as not being up to Interstate standards.〔(【引用サイトリンク】title=California Highways: Routes 9 through 16 )〕 The route interchanges with I-805; however, one can only continue in the same direction that they were going at this interchange, since this is the interchange of two north–south freeways, resulting in the overall shape of an "X." Between the Polk Avenue and Orange Avenue overpasses, the freeway goes under a city park that was built on top of the freeway during construction in 2001. Pedestrian bridges were also built at Monroe Avenue and Landis Street to reduce the effects of the freeway geographically dividing the community.〔(Caltrans District 11 Fact Sheet for SR 15 Project )〕 Between I-8 and I-805, SR 15 follows the former alignment of 40th Street, which was its former routing as a city street. It continues seamlessly into the southern terminus of I-15 at I-8 in San Diego. On the northbound conversion to I-15 at I-8, there is no "End SR 15" sign.〔(【引用サイトリンク】work= California @ AARoads.com )
I-15 is part of the California Freeway and Expressway System,〔 and it is eligible for designation as a state highway within the State Scenic Highway System; however the state transportation authority, Caltrans, has not done so. There are various local names for the highway, such as the Escondido Freeway between San Diego and Escondido. I-15 between SR 163 and Pomerado Road/Miramar Road is known as the Semper Fi Highway in recognition of the nearby Marine Corps Air Station Miramar.〔 〕 North of the Escondido city limits it is known as the Avocado Highway, whose designation ends upon entering Temecula. There are other local names as noted below.
Heading northward, I-15 currently begins at I-8, at the same place that its continuation, SR 15, begins its southward journey. I-15 goes through Mission Valley and intersects with SR 52, before merging with SR 163. After traversing the Marine Corps Air Station Miramar, I-15 comes into Rancho Peñasquitos, where it intersects with the end of SR 56. Northward, the route crosses Lake Hodges inside the upper San Diego city limits. I-15 continues north into Escondido, where it interchanges with SR 78.
North of Escondido, I-15 goes through hilly terrain and farmland, descending to the town of Fallbrook and intersecting SR 76 (SR 76), before it crosses the county line into Riverside County and descends to the Inland Empire. In Riverside County, SR 79 joins I-15 and runs concurrently with the route for a 3.2-mile (5 km) portion in Temecula, before it splits away running north to Hemet. Then, I-15 intersects with the southern end of I-215, which continues the designation of the Escondido Freeway. I-15 continues north as the Temecula Valley Freeway.
splits from its first and only spur route in California, I-215, which runs through the two largest cities in the Inland Empire, San Bernardino and Riverside. I-15 runs along the eastern edge of the Santa Ana Mountains, passing the city of Lake Elsinore. In the city of Lake Elsinore, I-15 intersects SR 74, an important surface route connecting the Coachella Valley with the communities of Idyllwild, Hemet, Perris, Lake Elsinore and San Juan Capistrano. It continues through the suburban areas in the western Inland Empire, passing Corona and Ontario, California. During this stretch of the highway, 1-15 intersects SR 91, a major east-west highway, in Corona; the oft-congested interchange serves as an important link from Southwest Riverside County to Riverside and Orange County. North of the SR 91, I-15 continues through the bedroom communities of Norco and Eastvale, while skirting the western edge of the city of Jurupa Valley. I-15 enters San Bernardino County at its intersection with SR 60, another major east-west highway, which connects 1-15 with the city of Ontario and the Chino Valley. I-15 passes through the city of Ontario on its way to another major intersection with I-10, the main east-west artery though Southern California. North of I-10, 1-15 passes through the major suburban communities of Rancho Cucamonga and Fontana as the highway intersects SR 210, an east-west highway skirting the San Bernardino Mountain Range. SR 210 connects 1-15 to major foothill communities, such as Pasadena, Rialto and San Bernardino. I-15 also crosses old US Route 66 during this stretch of highway, which is signed as SR 66, Foothill Blvd. At this juncture, 1-15 takes a strongly northeastern alignment as it moves to rejoin with its spur route, I-215, in Devore, north of the city of San Bernardino. The highway is then rejoined by I-215, before heading northwards and upward through the Cajon Pass, an important mountain pass that is the primary route between Southern California and points eastwards and northeastwards.
that is located between its northern and southern junctions with is also used by many local residents as the major north–south route for the western portions of the San Bernardino-Riverside-Ontario metropolitan area. serves a similar function in the eastern portion of the metropolitan area. These two highways are the only continuous north–south freeways in the area.)
North of Limonite Avenue (south of SR 60), I-15 is known as the Ontario Freeway. After its merger with I-215 in Devore, I-15 is called the Barstow Freeway or the Mojave Freeway. A short section between SR 138 and Oak Hill Road is also designated as the CHP Officer Larry L. Wetterling and San Bernardino County Sheriff’s Lieutenant Alfred E. Stewart Memorial Highway, named after two officers killed in the line of duty.〔(【引用サイトリンク】url=http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=200920100ACR127 )〕 On this stretch of highway, I-15 northbound splits from I-15 southbound, where the road ascends up a steep grade until it reaches Cajon Summit (elevation 4190 feet) just south of the High Desert community of Apple Valley. Tractor Trailer trucks headed southbound are advised to travel at 35 mph or less due to the steep downward grade. The southbound lanes provide runaway truck ramps as a safety feature. The two halves of the highway rejoin shortly before reaching Cajon Summit.
North of the Cajon Pass, I-15 traverses the Mojave Desert towns of Hesperia and Victorville. I-15 passes through desert for before reaching Barstow, then continues past Zzyzx Road, before reaching the town of Baker. The sign for Zzyzx Road — alphabetically the last place name in the world — is a landmark of sorts on the drive between Los Angeles and Las Vegas. I-15 enters Nevada near the casino town of Primm, formerly known as Stateline, Nevada.
thereafter to Las Vegas, Salt Lake City, and on into Idaho and Montana, before ending at the Canadian border, where Alberta Highway 4 continues the ribbon of asphalt into Canada. Because it joins with the western end of I-70 in Southwestern Utah, I-15 also forms part of a major east–west corridor connecting Southern California with Denver, St. Louis, and points east.
The Mojave Freeway is fairly busy on weekdays, since it connects the rapidly growing exurbs of the Victor Valley with the Los Angeles area. On weekends and holidays, however, it can sometimes be jammed with Californians driving to Las Vegas for short vacations.〔The highway was featured on the television program ''Dangerous Drives'' (Speed), which illustrated the difficulties of patrolling the highway due to excessive speed and congestion. The 45-minute episode "Dangerous Drives: Highway Patrol" originally aired in January 2010.〕
Construction is currently underway to rehabilitate the pavement on I-15 and to add truck lanes to separate autos from truck traffic.

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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