Volvo S80 Owner's Manual page 175

Limitations
The sensor in City Safety™ is designed to
detect cars and other large vehicles in front of
the car irrespective of whether it is day or
night.
However, the sensor has limitations and has
poorer functionality - or none at all - in e.g.
heavy snowfall or rain, dense fog, dust
storms or white-out situations. Mist, dirt, ice
or snow on the windscreen may disrupt the
function.
Low-hanging objects, e.g. a flag/pennant for
projecting load, or accessories such as auxili-
ary lamps and bull bars that are higher than
the bonnet limit the function.
The laser light from the sensor in City
Safety™ measures how the light is reflected.
The sensor cannot detect objects with low
reflection capacity. The rear sections of the
vehicle generally reflect the light sufficiently
thanks to the number plate and rear light
reflectors.
On slippery road surfaces the braking dis-
tance is extended, which may reduce the
capacity of City Safety™ to avoid a collision.
In such situations the ABS and DSTC sys-
tems will provide best possible braking force
with maintained stability.
When your own car is reversing, City Safety™
is temporarily deactivated.
City Safety™ is not activated at low speeds -
under 4 km/h, which is why the system does
not intervene in situations where a vehicle in
front is being approached very slowly, e.g.
when parking.
Driver commands are always prioritised,
which is why City Safety™ does not intervene
in situations where the driver is steering or
accelerating in a clear manner, even if a colli-
sion is unavoidable.
When City Safety™ has prevented a collision
with a stationary object the car remains sta-
tionary for a maximum of 1.5 seconds. If the
car is braked for a vehicle in front that is mov-
ing, then speed is reduced to the same speed
as that maintained by the vehicle in front.
On a car with manual gearbox the engine
stops when City Safety™ has stopped the
car, unless the driver manages to depress the
clutch pedal beforehand.
04 Driver support
City Safety™
NOTE
•
Keep the windscreen surface in front
of the laser sensor free from ice, snow
and dirt (see the illustration for sensor
location on page 172).
•
Do not affix or mount anything on the
windscreen in front of the laser sensor
•
Remove ice and snow from the bonnet
- snow and ice must not exceed a
height of 5 cm.
Fault tracing and action
Windscreen Sensors
If the message
blocked is shown in the combined instru-
ment panel it indicates that the laser sensor is
blocked and cannot detect vehicles in front of
the car. This means that City Safety™ is not
operational.
Windscreen Sensors blocked
The
is not shown for all situations in which the
laser sensor is blocked. The driver must
therefore be diligent about keeping the wind-
screen and area in front of the laser sensor
clean.
The following table presents possible causes
for the message being shown, along with
suggestions for appropriate action.
04
message
173