112 Adaptive cruise control
The Audi braking guard is active from a speed
of approx. 20 mph (30 km/h) and works with-
in the system limits ¢
page 110 even when
the adaptive cruise contro l is deactivated.
A radar sensor is bui lt into the front of the ve-
hicle
¢ page 100, fig. 109. The system is in-
tended to measure the distance to reflective
surfaces. If a measurement is not possible,
the system does not respond .
When the measurement has taken place, the
system can assess a hazardous situation,
when a vehicle ahead suddenly brakes or when
your own vehicle is driving at high speed to-
wards a much slower vehicle ahead. As soon
as the system assumes that a possible colli-
sion with the vehicle ahead can on ly be avoid-
ed by immediate all-out braking or by an
avoiding maneuver, a warning appears .
The system has a pre-set response time to be
able to warn in good t ime. This system re-
sponse time is automat ically reduced if you
accelerate actively, for examp le to join a high-
way. Braking, transverse acceleration and the
steering angle can lead to a reduced system
response time . The warning is deactivated if
you begin to overtake with fu ll acceleration.
The system draws your attention to two differ-
ent hazardous situations:
Distance
The distance warn ing is issued in the event of
inadequate distance to the vehicle ahead ape-
riod of more than 5 seconds. If the distance is
less than 30 feet (9 meters) at 50 mph
(80 km/h) , for example, an optical display is
faded in on the instrument cluster ¢
fig. 128.
If the vehicle ahead brakes sharply , a collision
cannot be avoided , even in the case of an im-
mediate response. In this case, increase the
distance to the vehicle ahead.
Speed
If there is a much slower vehicle ahead in your
lane, or if the vehicle ahead brakes sharply,
the Audi braking guard calculates the point
from which a collision can only be avoided by
all-out braking or by an avoiding maneuver. If
a warning does sound, a possible collision
with the vehicle in front can be avoided
through an evasive maneuver or by braking .
The warning is given in two stages:
- Pre-warning: An optical display appears in
the instrument cluster and a warning tone
sounds.
- Acute warning: If you do not respond to the
pre-warn ing, the second stage, the acute
warning, is issued . A brake jolt reminds you
to concentrate on the road again.
Under heavy breakin g, brake assist
¢
page 204 also helps you obta in maximum
braking efficiency.
.&_ WARNING
~
Always pay attention to traffic, even when
the Audi braking guard is switched on. You
are always responsible for your speed and
the distance between your vehicle and oth·
er vehicles.
-Always keep the legally stipulated safety
distance between your vehicle and the
vehicle ahead • danger of accident!
- The Audi braking guard does not respond
outside the system limits, for example if
you approach a stationary obstacle (end
of a traff ic jam or breakdown vehicle).
- Please observe that the Audi braking
guard is subject to restrictions in narrow
bends due to the field of vision of the ra-
dar sensor. This may possibly lead to ob-
stacles not being detected.
- The radar sensor's
vision can be reduced
by rain, snow and heavy spray. This can
result in vehicles driving ahead being in-
adequately detected or, in some circum-
stances, not detected at all. Always
watch where yo u are driving .
- Reflecting objects such as e.g. crash bar-
riers or the entrance to a tunne l may im-
pair the function of the radar sensor.
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