Portal:California roads

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The California Roads Portal

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The highway system of California is a network of roads owned and maintained by the state of California through the California Department of Transportation (Caltrans). Most of these are numbered in a statewide system, and are known as State Route X (abbreviated SR X). United States Numbered Highways are labeled US X, and Interstate Highways are Interstate X, though Caltrans typically uses State Route X for all classes.

Interstate Highways and U.S. Highways are assigned at the national level. Interstate Highways are numbered in a grid—even-numbered routes are east–west routes (with the lowest numbers along Mexico and the Gulf of Mexico), and odd-numbered routes are north–south routes (with the lowest numbers along the Pacific Ocean). U.S. Highways are also numbered in a grid—even numbered for east–west routes (with the lowest numbers along Canada) and odd numbered for north–south routes (with the lowest numbers along the Atlantic Ocean). There are 21 Interstate Highways in California, ranging from Interstate 5 to Interstate 980. There are seven current U.S. Highways including U.S. Route 6 and U.S. Route 395.

California State Routes are managed by Caltrans and designated by the California State Legislature. The state route's signs are in the shape of a miner's spade to honor the California Gold Rush. Each state highway in the U.S. state of California is assigned a Route (officially State Highway Route) number in the Streets and Highways Code (Sections 300-635). Since July 1 of 1964, the majority of legislative route numbers, those defined in the Streets and Highways Code, match the sign route numbers. On the other hand, some short routes are instead signed as parts of other routes — for instance, State Route 112 and State Route 260 are signed as part of the longer State Route 61, and State Route 51 is part of Interstate 80 Business. California County Routes are marked with the usual County route shield, and are assigned a letter for where they are located. For instance, county highways assigned "S" are located in Southern California, ones assigned "J" are found in Central California, and those assigned "A" are located in Northern California.

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U.S. Route 80 (US 80) was a U.S. highway in California that continued east across the country to Georgia. The western terminus was in San Diego, California, and US 80 continued east through the city on several different alignments through the years. The highway went through the Cuyamaca Mountains, encountering many switchbacks, before descending to El Centro. After passing through the sand dunes, the highway crossed the Colorado River into Yuma, Arizona. The highway replaced a 1912 plank road across much of Imperial County. The winding two-lane road through the Cuyamaca Mountains was one of the factors that led to a four-hour journey from San Diego to El Centro. During the 1930s, the road was realigned through the mountains, but several curves remained. In the 1950s, work began on constructing what would become Interstate 8 (I-8) to replace the old highway in San Diego to bypass the cities of San Diego, La Mesa, and El Cajon. The construction continued across the rest of the route through the next two decades. US 80 was gradually decommissioned after 1964 as I-8, through San Diego and Imperial counties, was completed. In 2006, the highway was designated by the California State Legislature as Historic U.S. Route 80.

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McClure Tunnel

Credit: Steve Lyon

McClure Tunnel in Santa Monica, California

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Did you know...

...that State Route 70, a National Scenic Byway through California's Feather River Canyon, was constructed using an access road laid out by the Utah Construction Company when it built the Western Pacific Railroad in the canyon?

...that the Sierra Highway was described in a promotional book to recruit teachers to California as "a highway with a hundred by-ways, each by-way with a hundred wonders"?

...that Alameda Street was built by Los Angeles County, California as a "truck boulevard" to the port?

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Highways • United States • California • U.S. Roads • U.S. Streets • California State Routes

Related projects: Los Angeles • San Diego • Southern California • Santa Barbara County • Inland Empire • San Francisco Bay Area

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