See also:

Hazard warning lamps
The hazard warning lamps automatically switch on if:  - an air bag is deployed.  - the vehicle is slowed down severely from a speed of over 45 mph(70 km/h) and comes to a halt. ...

General notes
The Active Driving Assistance package consists of DISTRONIC PLUS, Active Blind Spot Assist and Active Lane Keeping Assist. ...

Activating/deactivating
WARNING Any accumulation of snow and ice should be removed from the rear window before driving. Visibility could otherwise be impaired, endangering you and others. The rear window defroster ...