California Emergency Vehicle Light Laws: The Steady Red Rule and Warning Lamp Classes

Key Takeaways

• California Vehicle Code § 25252 requires every authorized emergency vehicle to be equipped with at least one steady-burning red warning lamp visible from at least 1,000 feet to the front of the vehicle.
• Blue warning lamps in California are restricted. Under 13 CCR § 818(d), the additional flashing or steady-burning blue warning lamp permitted by Vehicle Code § 25258(b) applies to police vehicles and must be a Class B, C, or E warning lamp.
• California Vehicle Code § 25269 prohibits displaying a flashing or steady-burning red warning light on a vehicle except as permitted by § 21055 or when a hazard exists.
• California Vehicle Code § 25268 prohibits displaying a flashing amber warning light except when an unusual traffic hazard exists, which is narrower than the general amber allowances in most states.
• Flashing amber warning lamps are required on California tow cars by Vehicle Code § 25253, and under 13 CCR § 818(e), that lamp must be a Class B, C, or E warning lamp.
• California regulates warning lamps by class as well as by color. Title 13 of the California Code of Regulations § 818 assigns Class A, B, C or E designations depending on the vehicle type and the directions in which the lamp is displayed.

 California is the most equipment-specific state in this series. Two things drive that. The Vehicle Code sets a mandatory steady-burning red lamp for every authorized emergency vehicle, and Title 13 of the California Code of Regulations classifies warning lamps by type, so that legality depends on the class of lamp fitted and not only on its color.

The California Highway Patrol publishes form CHP 884, a summary table of required and permitted warning lamps by vehicle type with the governing Vehicle Code section for each. If you specify California fleets, that document is the single most useful reference in the state.

The Steady-Burning Red Requirement

Vehicle Code § 25252 states that every authorized emergency vehicle shall be equipped with at least one steady-burning red warning lamp visible from at least 1,000 feet to the front of the vehicle, to be used as provided in the code. In addition, authorized emergency vehicles may display revolving, flashing or steady red warning lights to the front, sides or rear.

The word steady is the one that matters. California does not treat a bank of flashing red LEDs as satisfying § 25252. There must be a steady burning red lamp meeting the 1,000-foot visibility standard, and modern low-profile installations sometimes overlook it entirely.

Section 21055 is the operative privilege statute. It sets out when the driver of an authorized emergency vehicle is exempt from certain rules of the road, and both § 25258 and § 25269 tie back to it, so operation under § 21055 is the condition that makes much of the permitted display lawful.

Warning Lamp Classes Under 13 CCR 818

Title 13 § 818 is where the equipment decisions actually get made. It assigns lamp classes by application.

The practical consequence is that "red LED light bar" is not a sufficient specification in California. The lamp has to fall within an approved class for the application. This is the same pattern as Pennsylvania's flash rate and SAE chromaticity requirements: a regulatory layer sitting underneath the statute that decides which products are actually usable.

Blue In California

Blue is the most searched question about California lighting, and the answer is restrictive. The additional blue warning lamp is permitted under Vehicle Code § 25258(b), and 13 CCR § 818(d) frames it as a permitted blue warning lamp on police vehicles.

There is no volunteer firefighter blue in California, no volunteer EMS blue, and no security blue. A responder relocating from Connecticut, New Jersey or New York, where blue is the volunteer color, should assume their existing equipment is not transferable.

Amber & The Hazard Conditions

California ties amber to conditions rather than to a general class allowance. Section 25268 prohibits displaying a flashing amber warning light as permitted by the code except when an unusual traffic hazard exists.

Section 25253 makes flashing amber a required lamp on tow cars, displayed to the front, sides or rear. Article 7 also contains a long series of narrow authorizations covering public utility vehicles under § 25260, state aqueduct and levee work, mosquito and pest abatement districts dispersing insecticides under § 25267, livestock herding under § 25270.5, and pilot cars operating under oversize permits per § 25270.

Because these are condition-based, the compliance question for a California fleet is rarely whether amber is allowed. It is whether the amber is on at a moment the statute permits.

Specifying a California Build

Start with the steady red lamp. If the vehicle is an authorized emergency vehicle, § 25252 is not optional, and it should be designed in rather than added later. Full-size light bars from manufacturers that publish lamp class data make this straightforward, and we stock Whelen, Federal Signal, and SoundOff Signal for that reason.

Tow operators have a required lamp rather than a permitted one, so tow light bars and 360 degree beacons should be selected against the front, sides, or rear display requirement in § 25253.

Utility, construction and abatement fleets should look at amber lights and traffic advisor arrow sticks, with switches and controllers that let operators keep the lights off outside the permitted hazard conditions.

Frequently Asked Questions

Are blue lights illegal in California?

Blue warning lamps in California are restricted. The additional flashing or steady-burning blue warning lamp is permitted under Vehicle Code § 25258(b), and 13 CCR § 818(d) treats it as a permitted blue warning lamp on police vehicles, requiring Class B, C, or E. There is no volunteer firefighter, volunteer EMS or security blue authorization in California.

Does California require a steady red light on emergency vehicles?

Yes. Vehicle Code § 25252 requires every authorized emergency vehicle to be equipped with at least one steady burning red warning lamp visible from at least 1,000 feet to the front of the vehicle.

Do California tow trucks need amber lights?

Yes. Vehicle Code § 25253 makes a flashing yellow warning lamp a required lamp on tow cars, displayed to the front, sides or rear. Under 13 CCR § 818(e) it must be a Class B, C or E warning lamp.

What are California warning lamp classes?

Title 13 of the California Code of Regulations § 818 assigns Class A, B, C or E designations to warning lamps depending on the vehicle type and the directions in which the lamp is displayed. Color alone does not determine whether a lamp is legal for a given application.

Last Updated & Disclaimer

Last reviewed: September 2026. This page summarizes Cal. Veh. Code §§ 25252-25269; 13 CCR § 818 and related provisions for general informational purposes. It is not legal advice. Statutes are amended and agency requirements change. Confirm current requirements with the official sources linked above, your department or agency, and the relevant state motor vehicle authority before purchasing or installing warning equipment.