The **EDR system** (Event Data Recorder) is a device that records important vehicle data in the event of a **collision**. This system is crucial for understanding what happened during an accident, as it stores information such as the vehicle's speed, brake usage, and other relevant data just before and after the impact.

- A **collision** is an event where a traffic accident occurs, and it is in these situations that the EDR is activated to record the necessary data.
- Although other safety systems, such as **autonomous emergency braking (AEB)** and **emergency brake warning (EBD)**, are designed to prevent accidents, the EDR focuses on recording information when an accident has already occurred.

Therefore, the EDR does not activate during a **sudden braking** or an **overtaking**, as these are not considered collisions. Its main function is to collect data in accident situations to assist in subsequent investigation and analysis.