State highways in California

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Standard route signage in California
System information
Notes	All classes of state-numbered highways are generally state-maintained.
Highway names
Interstates	Interstate X (I-X)
US Highways	U.S. Route X (US X)
State	State Route X (SR X)
System links
State highways in California Interstate US State Scenic History Pre‑1964 Unconstructed Deleted Freeways

The state highway system of the U.S. state of California is a network of highways that are owned and maintained by the California Department of Transportation (Caltrans).

Each highway is assigned a Route (officially State Highway Route^[1][2]) 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 California Highway Patrol (CHP) is tasked with patrolling all state highways to enforce traffic laws.^[3]