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The U.S. State of California has a large interconnected state highway system. Each highway is assigned a ''Route'' (officially ''State Highway Route''〔California Streets and Highways Code, Section 231〕〔Caltrans, (Other State Highway Routes )〕) number in the Streets and Highways Code (Sections 300-635). 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''. Under the code, the state assigns a unique ''Route X'' to each highway, and does not differentiate between state, US, or Interstate highways. The system is maintained by the California Department of Transportation (Caltrans). The California Highway Patrol (CHP) is tasked with patrolling all state highways to enforce traffic laws. ==Overview== California's highway system is governed under the state's Streets and Highways Code. Since July 1 of 1964, the majority of ''legislative route numbers'', those defined in the Streets and Highways Code, match the ''sign route numbers''. For example, Interstate 5 is listed as "Route 5" in the code. On the other hand, some short routes are instead signed as parts of other routes — for instance, Route 112 and Route 260 are signed as part of the longer State Route 61, and Route 51 is part of Interstate 80 Business. Concurrences are not explicitly codified in the Streets and Highways Code; such highway segments are listed on only one of the corresponding legislative route numbers — for example, the I-80/I-580 concurrency, known as the Eastshore Freeway, is only listed under Route 80 in the highway code while the definition of Route 580 is broken into non-contiguous segments. The state may ''relinquish'' segments of highways and turn them over to local control. If the relinquished segment is in the middle of the highway's route, the local jurisdiction is usually required to install and maintain signs directing drivers to the continuation of that highway; they are not generally required to do so if the relinquishment effectively truncates the highway at one end, or is done as part of the process to re-route a highway. The state may also ''delete'' a highway completely and turn over an entire state route to local control. Business routes are not maintained by the state unless they are also assigned legislative route numbers. A few routes or sections of routes are considered ''unrelinquished'' - a new alignment has been built, or the legislative definition has changed to omit the section, but the state still maintains the roadway — and are officially ''Route XU''. State Route 14U, an old alignment of State Route 14, is the only one signed as such. Some new alignments are considered ''supplemental''〔(Metadata for ST_HWY GIS data layer ) (PDF)〕 and have a suffix of S; State Route 86S, a replacement for State Route 86 between approximately three miles north of the Imperial/Riverside County line west of the Salton Sea and Interstate 10 east of Indio is the only one that includes the "S" suffix on its signing. Both types of suffixed routes are also considered ''spurs''.〔(January 1, 2006 California Log of Bridges on State Highways ) (calls State Route 14U and State Route 180S, among others, spurs)〕 Current or former unsigned suffixed routes include State Route 156U, signed as State Route 156 Business through Hollister, and State Route 180S, the freeway replacement for State Route 180 in Fresno (now signed as SR 180). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「State highways in California」の詳細全文を読む スポンサード リンク
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