AUTONEWS

EDR (event data recorder): The mysterious "black box" in your car that knows a lot about you

Imagine you get into your car, start the engine, put it in first gear and drive off. You might think you're alone. And maybe you are. However, hidden under the dashboard, there is a discreet observer: the "black box". In theory, it only monitors traffic, but its existence raises many questions among drivers, who suspect that these boxes are used to record their conversations, their trips, or even their musical preferences.

The car's black box is actually called an EDR, an acronym for Event Data Recorder. Although we call it a "black box" because it has a function similar to that of airplane cockpits, it is usually bright orange (just like airplane cockpits) to make it easier to locate in the wreckage of an accident. Its use has been mandatory in all new cars and vans registered in Europe since 2024 (some models already had it before). Its main function is to record parameters that allow the reconstruction of events with millimeter precision.

'Wake-up' in case of an accident...The device remains inactive during normal driving, although it constantly records and deletes data. It only saves recorded information when it detects an event, such as airbag deployment or a sudden change in speed, of milliseconds, typical of an accident. At that exact moment, it saves the five seconds before the impact and the few seconds after. Outside of this period, the device cyclically deletes the information.

The EDR monitors the vehicle's exact speed before the collision, the accelerator pedal position (checking if you were trying to accelerate or maintaining a constant speed), the pressure applied to the brake, the steering wheel angle (to determine if you were trying to avoid the obstacle or if the vehicle left its trajectory due to a mechanical failure), whether the seat belts were fastened, and much more. It can even record the force of the impact, thanks to highly sensitive internal accelerometers (similar to those in your cell phone that detect whether it is vertical or horizontal). All this information is vitally important for clarifying the facts in court or for filing a claim with the insurance company.

There is a widespread myth about voice recordings in cars. However, the reality is that these "black boxes" do not have microphones. Therefore, your conversations with passengers, your phone calls, or your favorite music are completely out of their reach. The system focuses exclusively on the physics of the vehicle. It doesn't even have external cameras monitoring your location, much less internal cameras recording your face or that of your passengers. All this because European regulations require strict driver privacy.

In fact, it doesn't even save the location or geographical coordinates. Its purpose is to explain how the accident occurred, leaving the location to other systems or to the police report itself. It's a device focused on the dynamics of movement, regardless of whether you're parked in front of a pharmacy or driving on a mountain road.

Access to confidential information...So, who can see what your car records after an accident? Only police authorities, forensic experts, or accident investigators have the necessary tools to extract the information. The connection port is usually the same one used in mechanic shops for routine checks, but it requires specific software and, most importantly, legal authorization.

Insurance companies welcome access to this data, as it speeds up procedures, but their power is limited by vehicle ownership legislation. The car owner holds this information, and the content of the Electronic Data Record (EDR) is only disclosed by court order or during official investigations. This prevents insurance companies from using minor driving errors to deny claims, except in cases of gross negligence proven by the police. It's a protective shield that ensures the truth prevails over the financial interests of large insurance companies.

Future usefulness...But, beyond determining fault in an accident, this system aims to save lives in the long term. By analyzing thousands of real accidents, engineers discover patterns that testing laboratories don't detect. If the data reveals that a particular car model tends to lose control under certain braking conditions, the manufacturer can correct this flaw in future versions. The black box allows each accident to become an engineering lesson to prevent its recurrence. It's a form of collective learning that has drastically reduced traffic deaths since its large-scale implementation.

Explaining its advantages, you might wonder if it's possible to install a "black box" in your car. If your car is older, you're not required to have this box, and the installation would be very expensive and complicated. However, if you bought a vehicle from mid-2024 onwards, it already comes with one as standard.