CITROËN C4 PICASSO Handbook page 167

When the dynamic cruise control is
automatically paused, it can only be
reactivated when safe conditions are
restored. The message "Activation
not possible, conditions unsuitable"
is displayed while reactivation is not
possible.
When the conditions allow, it is
recommended that the system be
reactivated by pressing button 2 or 3,
which will make the current speed of
your vehicle the new cruise speed
setting, rather than by pressing button 4
(on/pause) which reactivates the system
using the old cruise speed setting,
which may be very different from the
current speed of your vehicle.
Limits of operation
The dynamic cruise control uses only engine
braking to slow the vehicle. Consequently the
vehicle loses speed slowly, as when releasing
the accelerator pedal.
The system is paused automatically:
- if the vehicle in front slows down too much
or too suddenly, and the driver does not
brake,
- if a vehicle comes between your vehicle
and the vehicle in front,
- if the system does not slow the vehicle
enough to continue to maintain a safe
distance, for example when descending a
steep hill.
The regulation range is limited to a maximum
difference of 20 mph (30 km/h) between the
speed setting and the speed of the vehicle in
front. Above this, the system goes into pause if
a safe distance is not maintained.
Severe weather conditions (very heavy
rain, accumulations of snow in front
of the radar) can interfere with the
operation of the system, resulting in
the display of the message "SYSTEM
INACTIVE: Visibility reduced". The
function remains unavailable until the
message disappears.
As the radar's field of view is quite narrow, it is
possible that the system may not detect:
- vehicles of reduced width, such as
motorcycles, for example,
- vehicles not running in the middle of the
lane,
- vehicles entering a corner,
- vehicles changing lane at the last moment.
The cruise control does not take account of:
- stationary vehicles,
- vehicles driving in the opposite direction.
Driving
4
165