State Highways in California

State Highways In California

Each state highway in the U.S. State of California is maintained by the California Department of Transportation (Caltrans) and is assigned a Route (officially State Highway Route) 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, though Caltrans typically uses Route X for all classes.

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, 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.

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 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. 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).

The California Highway Patrol (CHP) is tasked with patrolling all state highways to enforce traffic laws.

Read more about State Highways In California:  History, Nomenclature in California English

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