Which one is this?

Hello,
Active braking assistant. Code 258

If the radar sensors detect a risk of collision with the vehicle in front at a speed of more than 30 km / h, the assistant warns you with a warning tone. If the driver neither brakes nor swerves despite the warning signal, light braking is initiated autonomously.

In vehicles without radar sensors, the driver is supported in the event of emergency braking.

I can not say whether the hazard warning lights are switched on as with MercedesCreated with translation program