Vauxhall Astra Owner's Manual page 181

180 Driving and operating
Driver's attention
■ Use adaptive cruise control
carefully on curvy or mountain
roads, as it can lose the vehicle
ahead and need time to detect it
again.
■ Do not use the system on slippery
roads as it can create fast changes
in tyre traction (wheel spinning), so
that you could lose control.
■ Do not use adaptive cruise control
during rain, snow or heavy dirt, as
the radar sensor can be covered by
a water film, dust, ice or snow. This
reduces or suppresses completely
the visibility. In case of sensor
blockage, clean the sensor cover.
System limits
■ The system's automatic brake force
does not permit strong braking and
the braking level may not be
sufficient to avoid a collision.
■ After a sudden lane change, the
system needs a certain time to
detect the next preceding vehicle.
So if a new vehicle is detected, the
system may accelerate instead of
braking.
■ Adaptive cruise control does ignore
the oncoming traffic.
■ Adaptive cruise control does not
brake for stopped vehicles,
pedestrians or animals.
Curves
The adaptive cruise control calculates
a predicted path based on the
centrifugal force. This predicted path
considers the current curve
characteristic, but cannot consider a
future curve change. The system may
lose the current vehicle ahead or
consider a vehicle which is not in the
actual lane. This can happen when
entering or exiting a curve or if the
curve gets stronger or weaker. If it no
longer detects any vehicle ahead,
then control indicator A will
extinguish.
If the centrifugal force is too high in a
curve, the system slows down the
vehicle slightly. This braking level is
not designed to avoid spinning off the
curve. The driver is responsible for
reducing the selected speed before
entering a curve and in general to
adapt the speed to the road type and
to existing speed limits.
Motorways
On motorways, adapt the set speed
to the situation and the weather.
Always consider that adaptive cruise
control has a limited visibility range, a
limited braking level and a certain
reaction time to verify if a vehicle is on
the driving path or not. Adaptive
cruise control may not be able to