IIII.___ A_ d_a,.:.p_t_i_v_e_ c_r_u_ is_ e_c_o_n_t_r_o_l _____________________________________________ _
The Audi braking guard is active from a speed of approx. 20 mph
(30 km/h) and works within the system lim its => page 125 even when
the adaptive cruise control is deactivated.
A radar sensor is built into the front of the vehicle => page 114,
fig. 106. The system is int ended 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 dr iving at high speed towards a much slower
vehicle ahead. As soon as the system assumes that a possible colli-
sion w ith the veh icle ahead can only be avoided 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
time. This system response time is automatically reduced if you accel-
erate actively, for example to join a highway. 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 full accelerat ion.
The system draws your attention to two different hazardous situa -
tions:
Distance
The distance wa rning is issued in the event of inadequate distance to
the vehicle ahead a period of more than S seconds. If the distance is
less than 30 feet (9 meters) at SO mph (80 km/h), for example, an
optical display is faded in on the instrument cluster=>
page 127,
fig. 125.
If the vehicle ahead brakes sharply, a collision cannot be avoided,
even in the case of an immediate 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 sha rply, the Audi braking guard calculates the point
from which a collision can only be avoided by all-out brak ing or by an
avoiding maneuver. If a war nin g does sound, a possible collision with
the vehicle in front can be avoided through an evasive maneuver or by
braking.
The warn ing 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-warning, the
second stage, the acute wa rning, is issued. A brake jolt reminds you
to concentrate on the road again.
Under heavy breaking, brake assist =>
page 233 a lso helps you obtain
maximum braking eff icien cy.
& 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 other 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
traffic jam or breakdown vehicle).
• Please observe that the Audi braking guard is subject to restric-
tions in narrow bends due to the field of vision of the radar sensor.
This may possibly lead to obstacles 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 inade-
quately detected or, in some circumstances, not detected at all.
Always watch where you are driving.
• Reflecting objects such as e.g. crash barriers or the entrance to
a tunnel may impair the function of the radar sensor. •
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