California Vehicle Code
Sec. § 440


An official traffic control device is any sign, signal, marking, or device, consistent with Section 21400, placed or erected by authority of a public body or official having jurisdiction, for the purpose of regulating, warning, or guiding traffic, but does not include islands, curbs, traffic barriers, speed humps, speed bumps, or other roadway design features.
Source
Last accessed
Jun. 6, 2016