Hazard Warning; Hazard Warning Lamps - CITROEN DS4 Owner's Handbook Manual

Direction indicators
Left: lower the lighting stalk passing the
point of resistance.
Right: raise the lighting stalk passing the
point of resistance.
If you forget to cancel the direction
indicators for more than twenty
seconds, the volume of the audible
signal will increase if the speed is
above 40 mph (60 km/h).
"Motorway" function
Press briefly upwards or downwards,
without going beyond the point of
resistance; the direction indicators will
flash 3 times.

Hazard warning

lamps
A visual warning by means of the direction
indicators to alert other road users to a vehicle
breakdown, towing or accident.
Press this button, the direction indicators
flash.
They can operate with the ignition off.