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Driving and Driving Safety
169
Prewarning (acoustic and visual)
If the radar sensor detects that the vehicle is
coming critically close to and is very likely to
collide with an obstacle moving in front, an
acoustic and visual prewarning is issued.
This warns the driver and still allows a collision to
be prevented if the driver reacts accordingly.
Acute warning (acoustic, visual and tangible)
If the driver does not react to the prewarning by
braking, this is quickly followed by an acute
warning, which involves a braking jolt as well as
the acoustic and visual warning.
A braking jolt is felt in the vehicle as a result
of a very quick build-up of brake pressure.
This alerts the driver to the traffic situation.
The driver can still prevent a collision by reacting
accordingly in this dangerous situation.
Information
The situations described below lead to the
assumption that the driver is driving carefully and
the prewarning and acute warning functions are
disabled:
– The driver drives around tight corners.
– The driver is braking.
– If the driver accelerates sharply, this action
is interpreted as an active driving request
(e.g. indicating the driver’s intention to
overtake).
– When adaptive cruise control is on, the
Porsche “Active Safe” warnings are inactive.
There is no need for these warnings because
adaptive cruise control decelerates in good
time and the visual and acoustic overtake
request “
Distance! Please brake!
” is issued
early as required.
Switching Porsche “Active Safe”
warnings on/off
The latent warning and prewarning functions are
switched off by default. The acute warning
function is active.
Latent warnings and prewarnings can be activated
under “
Prewarning on
” on the multi-purpose
display.
The settings remain stored when the ignition is
switched on and off.
f
Please see the chapter “ACTIVE SAFE (PAS)”
on page 131.