CITROEN C5 AIRCROSS Handbook page 160

Driving
After an impact, the function automatically
stops operating. Contact a CITROËN
dealer or a qualified workshop to have the
system checked.
Collision Risk Alert
It warns the driver if their vehicle is at risk of
collision with the vehicle in front or a pedestrian
present in their traffic lane.
Modifying the alert trigger
threshold
This threshold determines how you wish
to be alerted of the presence of a moving
or stationary vehicle in front of you, or
a pedestrian or cyclist present in your traffic
lane.
The current threshold can be
modified via the Driving/Vehicle
menu of the touch screen.
You can select one of three predefined
thresholds:
- "Distant",
- "Normal",
- "Close".
The last threshold selected is memorised when
the ignition is switched off.
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Operation
Depending on the degree of risk of collision
detected by the system and the alert threshold
chosen by the driver, several different levels
of alert may be triggered and displayed in the
instrument panel.
They take account of the vehicle dynamics, the
speed of your vehicle and the one in front, the
environmental conditions and the operation of
the vehicle (cornering, actions on the pedals,
etc.) to trigger the alert at the best moment.
Level 1 (orange): visual alert only,
signalling to you that the vehicle in
front is very close.
The "Vehicle close" message is
displayed.
Level 2 (red): visual and audible
alert, warning you that a collision is
imminent.
The message "Brake!" is displayed.
Level 3: finally, in some cases, a
haptic alert in the form of micro-
braking can be given, confirming the
risk of collision.
Where the speed of your vehicle is too
high when approaching another vehicle,
the level 2 alert may be displayed
immediately.
Important: the level 1 alert is never
displayed for a stationary obstacle or
when the "Close" trigger threshold has
been selected.
Intelligent emergency
braking assistance
If the driver brakes, but not sufficiently to avoid
a collision, this system will supplement the
braking, within the limits of the laws of physics.
This assistance will only be provided if you
press the brake pedal.