BMW Z4 Roadster Owner's Handbook Manual page 195

Active Cruise Control with
Stop & Go ACC
Principle
This system allows you to set a desired speed
and a desired distance from the vehicle in front,
using the buttons on the steering wheel.
When the road ahead is clear, the system main‐
tains the desired speed by braking or accelerat‐
ing the vehicle automatically, as required.
If there is a vehicle driving in front, the system
adapts your own vehicle speed in order to main‐
tain the set distance from the vehicle ahead. The
speed is adapted as far as the given situation al‐
lows.
General
A radar sensor is fitted in the front bumper and a
camera on the rear-view mirror for detecting ve‐
hicles driving in front.
Depending on the vehicle setting, the character‐
istics of Cruise Control may change in certain
areas, for example acceleration in ECO PRO
drive mode is less pronounced.
The distance can be set in several stages, and is
dependent on the individual speed for reasons of
safety.
If the vehicle ahead brakes to a standstill and
sets off again shortly afterwards, the system can
recognise this within the given context.
Safety notes
WARNING
The system does not relieve you of your per‐
sonal responsibility to assess the traffic situa‐
tion correctly. Due to system limitations, it can‐
not respond independently and appropriately in
all traffic conditions. There is a danger of acci‐
dents. Adapt your driving style to the traffic
Driver Assistance Systems
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conditions. Observe the traffic situation and in‐
tervene actively if the situation warrants it.
WARNING
An unsecured vehicle can start moving and roll‐
ing away. There is a danger of accidents. Be‐
fore leaving the vehicle, secure it to prevent it
from rolling away.
Observe the following to ensure that the vehi‐
cle is secured against rolling away:
▷ Apply the parking brake.
▷ Turn the front wheels towards the kerb on
upward or downward gradients.
▷ Additionally secure the vehicle on upward
or downward gradients, for example with a
chock.
WARNING
The desired speed may be accidentally set in‐
correctly or called up by mistake. There is a
danger of accidents. Adjust the desired speed
to the traffic conditions. Observe the traffic sit‐
uation and intervene actively if the situation
warrants it.
WARNING
There is a danger of accidents if the difference
in speed relative to other vehicles is excessively
high. This may occur, for example, in the
following situations:
▷ When quickly approaching a slowly mov‐
ing vehicle.
▷ If another vehicle suddenly veers into the
vehicle's own lane.
▷ When quickly approaching stationary vehi‐
cles.
There is a danger of injury or even death. Ob‐
serve the traffic situation and intervene actively
if the situation warrants it.
CONTROLS
195