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The highway system ofCalifornia is a network of roads owned and maintained by the state of California through theCalifornia Department of Transportation (Caltrans). Most of these are numbered in a statewide system, and are known asState Route X (abbreviatedSR X).United States Numbered Highways are labeledUS X, andInterstate Highways areInterstate X, though Caltrans typically usesState Route X for all classes.


Interstate Highways andU.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 alongMexico and theGulf of Mexico), and odd-numbered routes are north–south routes (with the lowest numbers along thePacific Ocean). U.S. Highways are also numbered in a grid—even numbered for east–west routes (with the lowest numbers alongCanada) and odd numbered for north–south routes (with the lowest numbers along theAtlantic Ocean). There are21 Interstate Highways in California, ranging fromInterstate 5 toInterstate 980. There areseven current U.S. Highways includingU.S. Route 6 andU.S. Route 395.


California State Routes are managed by Caltrans and designated by theCalifornia State Legislature. The state route's signs are in the shape of a miner'sspade to honor theCalifornia Gold Rush. Eachstate highway in the U.S. state of California is assigned aRoute (officiallyState Highway Route) number in theStreets and Highways Code (Sections 300-635). Since July 1 of 1964, the majority oflegislative route numbers, those defined in the Streets and Highways Code, match thesign route numbers. On the other hand, some short routes are instead signed as parts of other routes — for instance,State Route 112 andState Route 260 are signed as part of the longerState Route 61, andState Route 51 is part ofInterstate 80 Business.California County Routes are marked with the usualCounty route shield, and are assigned a letter for where they are located. For instance, county highways assigned "S" are located inSouthern California, ones assigned "J" are found inCentral California, and those assigned "A" are located inNorthern California.
State Route 56(SR 56) is an east–weststate highway in the U.S. state ofCalifornia. It runs 9.210 miles (14.822 km) fromInterstate 5 (I-5) in theCarmel Valley neighborhood ofSan Diego toI-15. The eastern terminus of the highway is also the western end of the Ted Williams Parkway. SR 56 serves as an important connector between I-5 and I-15, being the only east–west freeway betweenSR 78 innorth San Diego County, several miles away, andSR 52 nearMarine Corps Air Station Miramar. It is also named theTed Williams Freeway, after the San Diego-bornbaseball player. SR 56 was added to the state highway system in 1959 as Legislative Route 278, and was renumbered SR 56 in the1964 state highway renumbering. Plans in 1964 were to connect SR 56 to the north end ofSR 125 and continue east toSR 67, but these plans did not come to fruition. The eastern end from Black Mountain Road to I-15 was completed in 1993; the western end from I-5 to Carmel Creek Road was completed in 1995 after several lawsuits filed by theSierra Club and other community groups. The two ends were not connected until the middle portion of the freeway was completed in 2004. The delay was largely due to funding issues and environmental concerns.
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