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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In the U.S. state of California, U.S. Route 50 (US 50) runs east from I-80 in West Sacramento to the Nevada state line in South Lake Tahoe. Portions within Sacramento are known as the Capital City Freeway and El Dorado Freeway. The western half of the highway in California, from I-80 through Sacramento and Placerville to Exit 60 in Pollock Pines is a four-or-more-lane divided highway, mostly built to freeway standards. US 50 continues as an undivided highway with one eastbound lane and two westbound lanes until it reaches the canyon of the South Fork American River at Riverton. The remainder of the highway, which climbs along and out of the canyon, then over the Sierra Nevada at Echo Summit and into the Lake Tahoe Basin, is a mainly two-lane road. The US 50 corridor is a historic one, used by many 49ers who came to California during the Gold Rush as well as the Pony Express. In 1895, part of the present-day route was designated as California's first state highway, and it was later considered as a scenic alternate of the Lincoln Highway. Much of US 50 was constructed during the initial construction of the California state highway system. During the second half of the twentieth century, US 50 was gradually designated and converted into a modern highway.

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Interstate 80 in California

Credit: Minesweeper

Interstate 80 is a major urban freeway though the East Bay, north of the Bay Bridge, in the San Francisco Bay Area (seen here in Berkeley, California).

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Did you know...

...that State Route 174, which includes a historic 1924 bridge, was not designated a State Scenic Highway due to opposition by residents concerned about their property rights?

...that the design of the Mission Valley Viaduct on Interstate 805 was inspired by the Mission San Diego de Alcalá and recognized by the American Society of Civil Engineers?

...that U.S. Route 199 is numbered as a spur of U.S. Route 99, which no longer exists?

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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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