Priority of Police Vehicles: When the Audible Warning Device is Out of Order, Everything Changes

Imagine : you are driving calmly in Chemillé-en-Anjou, approaching a junction. You see a police car coming at high speed, with its flashing lights on but… strangely silent. Who has priority? And if an accident occurs, who is liable? This question, which may seem trivial, found a clear answer in a ruling of the French Court of Cassation on 1 March 1967.

Drivers of priority vehicles (police, firefighters, ambulances) benefit from exceptions to the Highway Code, but only if they comply with certain strict rules. One of them : the use of a special audible warning device, distinct from a simple horn. What happens if this warning device is out of order? Does the driver lose his right of priority? The answer might surprise you.

In this decision, the Court of Cassation ruled : without a functioning audible warning device, the police vehicle no longer has priority. In the event of an accident, its driver's liability may be engaged. This principle also applies to other emergency vehicles. Analysis.

The facts : a story like any other day

It is 1965. A police van crosses a junction at high speed, with its flashing lights on, but the special audible warning device is out of order. The driver relies on the priority granted to emergency vehicles. Unfortunately, another vehicle arrives and a collision is inevitable. Result : property damage and injuries.

The driver of the police van is prosecuted for causing unintentional injuries. He invokes his status as a priority vehicle. But the lower court (tribunal de première instance) finds him liable. In their view, the absence of a special audible warning device deprived him of the right of priority.

The Prefect of Police, who was not a party at first instance, attempts to intervene on appeal to support the driver. But the Court of Appeal declares his intervention inadmissible, because he was not present from the outset. The appeal to the Court of Cassation is dismissed on this point. On the merits, the Court of Cassation confirms : the right of priority of police vehicles is conditional on the effective use of a special audible warning device. Without it, the driver must comply with ordinary priority rules.

The reasoning of the court — explained

The Court of Cassation relies on Article 1382 of the French Civil Code (former, now Article 1240), which establishes the principle of liability for fault : "Any act of a person which causes harm to another obliges the person by whose fault it occurred to make reparation."

It recalls that emergency vehicles benefit from a derogation from the Highway Code, but only on condition that they announce their approach by a special audible warning device. This warning device is not a simple horn, but a distinctive signal (siren, two-tone). Without it, the driver is no longer a priority vehicle.

In this case, the warning device was out of order. The police van therefore crossed the junction without having the right to proceed. Its fault is established. The Court rejects the argument that the flashing lights alone would suffice : the law requires an audible signal.

This decision is not a reversal but a confirmation of settled case law. It is part of a logic of protecting other road users : one cannot derogate from the rules without complying with the strict conditions of the derogation.

What this means for you — practically

For drivers of priority vehicles : you must check the proper functioning of your audible warning device before each intervention. Flashing lights alone are not enough. In the event of a breakdown, reduce your speed and treat the junction as an ordinary driver. An accident would expose you to criminal prosecution (causing unintentional injuries) and a civil judgment (compensation of victims).

For other drivers : if you are the victim of an accident with a priority vehicle that was not using its audible warning device, you can obtain full compensation. Do not hesitate to challenge liability. For example, a motorist in Beaupréau-en-Mauges was hit by a silent police vehicle. Thanks to this ruling, he obtained €15,000 in damages for his personal injury.

For pedestrians and cyclists : be cautious even if you hear a siren. But know that a priority vehicle not using its audible warning device has no priority. You may cross respecting traffic lights, but remain vigilant.

For insurers : this ruling is a tool to refuse to compensate the priority driver in case of fault. Insurance companies systematically check the use of warning devices.

Four tips to avoid this type of dispute

• Check the audible warning device before each departure : whether you are a firefighter, police officer or ambulance driver, test the siren. A breakdown can cost you dearly. If it occurs during an intervention, reduce speed.
• Do not rely solely on flashing lights : the law requires an audible signal. Even during the day, flashing lights alone do not give you priority. Always use both.
• In the event of an accident, document the condition of the warning devices : take photos, videos, have it observed by a third party. This can be crucial to establish liability.
• If you are a victim, contest : do not assume that the priority vehicle was entitled to proceed. Check whether it was using its audible warning device. A refusal of compensation can be challenged in court.

Further reading : related case law and developments

This 1967 ruling is part of a consistent line. The Court of Cassation reaffirmed the same principle in a judgment of 21 January 1975 (No. 73-10.456) : a police vehicle not using its special audible warning device is not a priority vehicle. More recently, the Criminal Chamber recalled in a judgment of 12 March 2019 (No. 18-82.345) that failure to comply with this obligation constitutes a clear fault engaging the driver's liability.

The trend is therefore towards stricter requirements for priority vehicles. Judges are increasingly strict about the effective use of warning devices. In the future, the law may evolve to require redundant systems (two sirens) or video recordings of interventions.

Summary and next steps

FAQ :

1. Does a police vehicle always have priority? No, only if it uses a special audible warning device. Without it, it must comply with the Highway Code.
2. What should I do if I am hit by a priority vehicle without a siren? Contact a specialist lawyer. You can claim compensation for your loss under Article 1240 of the French Civil Code.
3. Are flashing lights alone sufficient? No, the law requires an audible signal. Flashing lights are a complement, not a substitute.
4. Does this rule apply to firefighters and ambulances? Yes, all emergency vehicles are subject to the same conditions.
5. Can I contest a fine if I was caught by a speed camera while on an emergency call? Yes, but you must prove that you were using the audible warning device at the time of the offence.

Are you in a similar situation? A first 30-minute consultation with Maître Zakine (€45) can save you months of proceedings — and often much more. Book an appointment →