Interstate 15 or I -15 is an Interstate Highway in the U.S. state of California. The freeway forms a north-south route in the south of the state, connecting the metropolitan areas of San Diego and Los Angeles with Las Vegas in Nevada. The highway begins in downtown San Diego and continues through the Inland Empire from Los Angeles through the mountains and the Mojave Desert to the Nevada border. Large parts of the route are urban, particularly in San Diego and the Inland Empire, as well as in the rapidly developing satellite towns surrounding these cities. The route in California is 462 kilometers long.
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The express lanes of I-15 in Escondido.
I-15 is a continuation of State Route 15 and begins at the interchange with Interstate 8. I-15 then has 2×4 lanes and passes the Qualcomm Stadium. I-15 connects two large office parks and the Marine Corps Air Station Miramar. In the north of San Diego there is an interchange with State Route 52, after which traffic from State Route 163 and I-15 has 6+2+2+6 lanes with express lanes in the median strip. In the northern suburb of Poway follows an interchange with State Route 56. The main lanes gradually narrow from 6 to 4 lanes in each direction, and the express lanes terminate at the interchange with State Route 78in Escondido. North of Escondido, I-15 has 2×4 lanes and leads through a more mountainous, less built-up area.
The conurbations of San Diego and Los Angeles have almost merged and there is barely 25 kilometers of semi-rural land between Escondido and the Inland Empire. The Inland Empire is defined as the area east of Los Angeles, consisting of an endless row of suburbs and is growing very fast, absorbing a significant part of the population growth in this region, because Los Angeles itself is already full. The first suburb is Temecula, 100 miles from downtown Los Angeles. In fact, San Diego is closer than Los Angeles. At Murrieta, Interstate 215 exits toward Riverside and San Diego. I-15 continues straight through the smaller suburbs between San Bernardino and Pomona. The highway is called the Corona Freeway hereand runs through the Temescal Valley to Corona, a large suburb. In Corona, one crosses State Route 91, the Riverside Freeway. From here, a lot of traffic turns to Los Angeles, which is still 100 kilometers away. The passage through the Corona region has express lanes.
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After this one crosses one of the largest industrial areas of Los Angeles, east of Ontario, which measures 10 by 10 kilometers. It also crosses State Route 60, the Pomona Freeway, which leads to Riverside and Moreno Valley to the east, and Ontario, Pomona, and Los Angeles to the west. A short time later they cross Interstate 10 via a stack junction. This is the main east-west highway from Los Angeles to Phoenix. You pass the Ontario Mills, a large shopping mall. You drive past the towns Rancho Cucamonga and Fontana. The highway here is called the Ontario Freeway. At Devore, Interstate 215. joinsback into and out of the urban jungle. After this one has to cross the San Gabriel Mountains, which is done by way of El Cajon Summit at 1298 meters altitude.
I-15 at the interchange with I-40 in Barstow.
After the El Cajon Summit, there is an exurban area around Hesperia, Apple Valley and Victorville. This is an important overflow area for Los Angeles, which is packed, and the Inland Empire, which fills up quickly. At Hesperia, US 395 exits, a major north-south route in eastern California and leads to the Sierra Nevada and Reno in western Nevada. After Victorville you leave the densely populated world for good and you enter the Mojave Desert, a dry desert with high mountains. The highway here is called the Barstow Freeway, named after the town of Barstow. Barstow is a fairly important interchange as this is where Interstate 40. begins, which runs to the east. One passes the ghost town of Calico, and comes through more and more remote area, the next hamlet is 100 kilometers away.
The highway runs through barren deserts with long straights in the route. One passes over and along a number of mountain ridges and along Mojave National Preserve, a nature park. Occasionally there are exits that lead to nowhere into the desert. Just before Baker you pass perhaps the most famous exit on a motorway, namely Zzyxx Road. At Baker one can access State Route 127to drive to Death Valley. However, the distances are quite long, it is another 180 kilometers to Zabriskie Point in Death Valley. Most striking in the desert is the 41 meter high thermometer in Baker. Again the highway has long straight lines, sometimes of tens of kilometers through the barren desert. At Mountain Pass you reach the highest point of I-15 in California at 1442 meters. From the last exit, it’s 14 kilometers straight to the Nevada border, with another oasis along the way. Here Interstate 15 in Nevada continues to Las Vegas.