Volvo S80 Owner's Manual page 149

04 Comfort and driving pleasure
Adaptive Cruise Control–ACC
driver must then intervene and adapt the
vehicle's speed to the surrounding traffic.
Automatic deactivation may be caused if:
• the vehicle's speed falls below 20 mph
(30 km/h)
• the wheels lose traction or if the anti-lock
brake system is activated
• brake temperature is high
• engine speed (rpm) is too low
04
• the radar sensor is obstructed by, for
example, wet snow or rain.
148
The radar sensor and its limitations
The radar sensor is used both by the adap-
tive cruise control and the collision warning
system. It is designed to detect vehicles or
larger vehicles driving in the same direction
as your vehicle. The radar sensor does not
detect pedestrians, or oncoming, slow or
stationary vehicles and objects. Warnings are
not given and the brakes are not applied in
such cases.
WARNING
Accessories or other objects must not be
installed in front of the grille.
Modification of the radar sensor could make
its use illegal.
The radar sensor's capacity to detect vehi-
cles ahead is impeded:
• if the radar sensor is obstructed and can-
not detect other vehicles, for example in
heavy rain, or if snow or other objects are
obscuring the radar sensor.
NOTE
Keep the area in front of the radar sensor
clean.
• if the speed of vehicles ahead is signifi-
cantly different from your own speed.
The radar sensor has a limited field of vision.
In some situations it may detect a vehicle
other than the one expected or not detect
vehicles at all.
1
2
3
Radar sensor field of vision (gray)
In certain situations, the radar sensor
cannot detect vehicles at close quarters,
for example a vehicle that suddenly en-
ters the lanes between your vehicle and
the one that the system has already de-
tected.
Small vehicles, such as motorcycles, or
vehicles not driving in the center of the
lane may remain undetected.