V2X communication is a revolutionary active safety technology.

Unlike traditional sensors (cameras, radars), which only see what is physically visible, V2X allows vehicles to 'talk' and 'listen' to their environment, thus detecting hidden or imminent dangers.

The V2X ecosystem is broken down into several subcategories: - **V2V (Vehicle-to-Vehicle):** Vehicles communicate directly with each other to share their position, speed, and direction.

Use case: a car performing an emergency brake can instantly alert the vehicles following it, even if they are obscured by a truck.

- **V2I (Vehicle-to-Infrastructure):** The vehicle communicates with infrastructure like traffic lights, signs, or work zones.

Use case: receiving a 'red light ahead' alert to optimize braking, or being warned of an icy patch detected by road sensors.

- **V2P (Vehicle-to-Pedestrian):** The vehicle communicates with vulnerable road users (pedestrians, cyclists) via their smartphones.

Use case: detecting a pedestrian about to cross from behind a stopped bus.

Technologically, V2X relies on two main standards: DSRC (based on Wi-Fi) and C-V2X (based on 4G/5G cellular networks).

By providing information that drivers and sensors cannot obtain on their own, V2X is considered an essential pillar for safe autonomous driving.