Vehicle Code section 27002

(a)

No vehicle, except an authorized emergency vehicle, shall be equipped with, nor shall any person use upon a vehicle any siren except that an authorized emergency vehicle shall be equipped with a siren meeting requirements established by the department.

(b)

An authorized emergency vehicle may also be equipped with a Hi-Lo audible warning sound meeting requirements established by the department.

(c)

A Hi-Lo warning sound may only be used to notify the public of an immediate evacuation in case of an emergency and is not a siren. For the purposes of Section 21055, a Hi-Lo shall not be used in lieu of a siren if the sounding of a siren is reasonably necessary pursuant to that section.

Source: Section 27002, https://leginfo.­legislature.­ca.­gov/faces/codes_displaySection.­xhtml?lawCode=VEH§ionNum=27002.­ (updated Sep. 29, 2020; accessed Jun. 25, 2025).

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Verified:
Jun. 25, 2025

§ 27002's source at ca​.gov