Electric Car Noise: What Is the AVAS Pedestrian Sound?

Electric cars are fitted with an Acoustic Vehicle Alerting System, known as AVAS, which generates an artificial sound at low speeds to warn pedestrians and cyclists of an approaching vehicle. This became a legal requirement for all new electric and hybrid cars sold in the UK and EU from July 2021. The sound plays automatically when the car is moving forward or reversing at low speed, typically cutting off once the vehicle reaches a speed at which tyre and wind noise are considered sufficient warning. If you are exploring EV ownership, you can browse our guides to understand more about how electric vehicles work day to day.

Why do electric cars need an artificial sound?

Electric motors are near-silent at low speeds. Conventional petrol and diesel engines generate significant mechanical noise even at a crawl, giving pedestrians a natural audio cue. Because EVs produce very little noise below a certain speed, pedestrians, cyclists, and particularly visually impaired people can struggle to detect them. AVAS was introduced specifically to close that gap, giving vulnerable road users the same kind of warning they would expect from a conventional vehicle.

What does the AVAS sound actually sound like?

The regulations specify that the sound must resemble that of a conventional vehicle and must rise and fall with vehicle speed, giving a sense of acceleration and deceleration. Beyond those parameters, manufacturers have creative latitude. Some brands use a subtle hum closely mimicking an internal combustion engine. Others have commissioned entirely unique tones, including purpose-designed futuristic sounds developed in collaboration with musicians or sound engineers. The result is that different EV models sound noticeably different from one another at low speed.

What the rules require

• The sound must be continuous while the vehicle moves at low speed
• It must be directional, so pedestrians can tell where the car is coming from
• It must vary naturally with speed to mimic acceleration and deceleration
• A minimum volume level is required to ensure audibility in real-world environments

At what speed does the AVAS cut out?

The system is designed to operate up to the speed at which tyre noise, wind noise, and other road sounds become clearly audible to a pedestrian nearby. Regulations set a defined threshold, and above that speed the AVAS is no longer required to produce sound because the car generates enough natural noise on its own. In practical terms, this means the sound is most prominent when you are pulling away from a junction, driving through a car park, or reversing onto a driveway.

Can the driver turn AVAS off?

No. Current UK and EU regulations do not permit drivers to disable AVAS. The system must remain active whenever the vehicle is in motion at the speeds covered by the legislation. Some earlier EVs, produced before the rules came into force, included an optional pedestrian warning sound that drivers could activate or deactivate at will, but those models predate the mandatory requirement. Any vehicle sold as compliant with the post-2021 rules has AVAS permanently enabled.

Does AVAS affect the driving experience?

Inside the cabin, AVAS is barely noticeable. The speakers project sound outward toward pedestrians rather than into the passenger compartment, so occupants rarely hear it clearly. Outside, the sound is clear enough to serve its warning purpose without being disruptive to neighbours or the general streetscape. Most EV drivers report that they become used to the system very quickly and stop noticing it. It does not affect performance, range, or any other aspect of how the car drives.

Will AVAS sounds change as EVs evolve?

Almost certainly. Manufacturers treat the AVAS sound as a brand identity element, and many have already revised their acoustic signatures across model generations. There is ongoing discussion about whether the regulatory minimum volume should be adjusted as EV numbers grow and the general public becomes more aware of quiet vehicles. For now, the legal framework is stable, and every new EV on UK roads must carry a compliant AVAS system.

Frequently asked questions

What does AVAS stand for?

AVAS stands for Acoustic Vehicle Alerting System. It is the standardised term used in UK and EU regulations for the artificial sound system that electric and hybrid vehicles must generate at low speed to alert pedestrians and cyclists to their presence.

Is AVAS fitted to all electric cars?

Yes, all new electric and plug-in hybrid vehicles sold in the UK and EU since July 2021 must be fitted with a compliant AVAS system. Older EVs produced before the regulation came into force may have had an optional pedestrian warning sound rather than a mandatory one.

Can I customise the AVAS sound on my EV?

In most cases, no. The sound is embedded in the vehicle's software by the manufacturer and must meet regulatory requirements. Some manufacturers offer a small selection of approved sounds through their companion apps or infotainment settings, but full customisation is not permitted under current rules.

Does AVAS work when reversing?

Yes. AVAS activates in both forward and reverse directions. This is particularly important for pedestrians in car parks or on pavements where a reversing EV might otherwise approach silently. Many vehicles also supplement AVAS with a separate audible reversing alert, similar to those fitted to vans and lorries.

Does the AVAS sound drain the battery?

The energy draw from the AVAS speaker system is negligible and has no meaningful impact on range. The system uses a small external speaker driven by the vehicle's 12V auxiliary battery rather than the high-voltage drive battery, so it contributes no significant energy consumption during normal use.

Will I hear the AVAS sound inside the cabin?

Generally not clearly. AVAS speakers are positioned to direct sound outward from the vehicle toward pedestrians. Inside a well-insulated EV cabin, the sound is typically very faint or inaudible at normal listening levels. If you are listening carefully with windows open, you may hear a faint tone at low speed.

Understanding how your EV works is the first step to getting the most from it. When you are ready to set up home charging, visit our charging cables by car page to find the right cable for your model, or explore our full range of Type 2 charging cables if you already know what connector your car uses.