California Vehicle Code 21055 allows the driver of an authorized emergency vehicle to disregard certain traffic laws — including speed limits, stop signs, red lights, and right-of-way rules — while responding to an emergency call, pursuing a suspected violator, or answering a fire alarm, but only when the vehicle is sounding a siren as reasonably necessary and displaying a lighted red lamp visible from the front.1California Legislative Information. California Vehicle Code 21055 A companion statute, Section 21056, makes clear the exemption does not relieve the driver of the duty to drive safely or shield anyone from the consequences of using the privilege carelessly.2California Legislative Information. California Vehicle Code 21056
Which Vehicles Qualify as Authorized Emergency Vehicles
A flashing light alone doesn’t do it. Vehicle Code 165 defines “authorized emergency vehicle” to include publicly owned and operated ambulances, fire department vehicles, and vehicles used by peace officers in the line of duty.3California Legislative Information. California Vehicle Code 165 The definition also reaches state-owned vehicles used for fire response, towing, or roadway electrical repairs, and vehicles operated by federally recognized Indian tribes for emergency calls. Privately owned ambulances count only if they hold a license from the California Highway Patrol Commissioner. Any other vehicle needs a specific authorized emergency vehicle permit issued by the CHP before it can claim 21055’s privileges.
Which Traffic Rules Section 21055 Suspends
The statute doesn’t hand out a blank check. It exempts qualifying drivers from specific chapters of the Vehicle Code. In practice, a driver operating under 21055 can lawfully:1California Legislative Information. California Vehicle Code 21055
- Proceed through red lights and disregard traffic signs and road markings.
- Drive on the wrong side of the road or outside the normal travel lane.
- Bypass right-of-way rules that would otherwise require yielding.
- Exceed posted speed limits.
- Roll through stop signs and railroad crossings that ordinarily require a full stop.
- Park or stand in restricted zones without violating parking prohibitions.
- Override pedestrian right-of-way rules, while still exercising care around people on foot.
The section also lifts certain off-highway vehicle regulations. Rules not listed in the statute continue to apply, and nothing in 21055 waives the underlying duty to drive safely.
Both Conditions Must Be Active at the Same Time
The exemption switches on only when two things are true together.
The Vehicle Is on an Active Emergency Response
The driver must be responding to an emergency call, engaged in a rescue operation, in immediate pursuit of an actual or suspected violator, or answering a fire alarm.1California Legislative Information. California Vehicle Code 21055 The direction of travel matters. The exemption applies going to an emergency, not coming back from one. An ambulance returning to the station after delivering a patient to the hospital has to obey every traffic law like any other vehicle on the road.
The Siren and Red Light Are Both On
The driver must sound a siren as may be reasonably necessary and display a lighted red lamp visible from the front. Both. Lights without a siren, or a siren without a visible front-facing red lamp, doesn’t satisfy the statute, and the exemption is not available. The front-facing red light exists to warn oncoming traffic and pedestrians so they can clear the way.
Fire Apparatus Gets Extra Room
Section 21055 treats fire vehicles more flexibly than other emergency vehicles. A fire truck can operate under the exemption not only when heading straight to a fire scene but also when relocating from one station to another because of an emergency call, or moving to any other location prompted by the call.1California Legislative Information. California Vehicle Code 21055 When one company rolls to a structure fire, another often shifts to cover the empty station, and that repositioning is treated as part of the response.
The Due Regard Ceiling Under Vehicle Code 21056
Vehicle Code 21056 sets the outer limit on everything 21055 allows. It states that nothing in the exemption relieves the driver of the duty to drive with due regard for the safety of everyone else on the road, and that the exemption does not protect a driver from the consequences of an arbitrary exercise of the privilege.2California Legislative Information. California Vehicle Code 21056
Due regard is a reasonableness standard measured against the specific circumstances. Running a red light with sirens on at an empty intersection at 2 a.m. is one situation. Doing the same through a crowded school zone at dismissal is another. Visibility, traffic density, road conditions, pedestrian activity, and the urgency of the underlying call all factor into whether the driver acted reasonably.
This is where 21055 tends to be misunderstood in litigation. When an emergency vehicle causes a crash, the injured party can argue the driver failed to exercise due regard. An active siren and a genuine call don’t automatically settle the question. What the court examines is whether the driver’s response was proportionate to the conditions on the road at that moment.
Immunity for Emergency Personnel and Where It Ends
Health and Safety Code Section 1799.107 gives public entities and emergency rescue personnel qualified immunity from liability for injuries caused while providing emergency services, provided they were acting within the scope of their employment.4California Emergency Medical Services Authority. Liability Protection For Dispatching Available Under Health And Safety Code 1799.107 The immunity does not apply when the conduct was performed in bad faith or in a grossly negligent manner.
The statute goes a step further and creates a presumption that emergency personnel acted in good faith and without gross negligence. The plaintiff carries the burden of overcoming that presumption.5California Legislative Information. California Health and Safety Code 1799.107 The protection is meaningful, but it isn’t absolute. Activating lights and sirens for a personal errand, or driving through a busy intersection at high speed without any attempt to slow, gives a plaintiff room to attack both the presumption and the underlying immunity.
Agencies face their own exposure. When gross negligence causes harm, the employing department can be liable alongside the individual driver, and patterns of poor training or tolerated recklessness can widen that liability beyond a single incident.
What Section 21055 Does Not Cover: The Duty on Other Drivers
Section 21055 governs the emergency driver. A separate statute, Vehicle Code 21806, tells everyone else what to do when an authorized emergency vehicle approaches with its siren sounding and a red lamp visible from the front.6California Legislative Information. California Vehicle Code 21806 Drivers in regular lanes must immediately pull to the right-hand edge or curb, clear of any intersection, stop, and remain stopped until the emergency vehicle passes. Drivers in carpool or bus-only lanes must exit the lane as soon as it is safe. Pedestrians must move to the nearest curb or safe spot and wait. If a traffic officer gives different instructions, those instructions control.