Road Sign Information (Rsi)* - Limitations; Driver Alert System; Driver Alert Control (Dac) - Volvo XC60 Owner's Manual

DRIVER SUPPORT
Road sign information (RSI)* -
limitations
The road sign information function (RSI – Road
Sign Information) helps the driver to remember
which speed-related road signs the car has
passed. The function has the following limita-
tions.
The RSI function's camera sensor has limitations
just like the human eye - read more about cam-
era sensor limitations (p. 236)).
Signs which indirectly provide information on a
prevailing speed limit, e.g. name signs for towns/
districts, are not recorded by the RSI function.
Here are several examples of what can disrupt
the function:
•
Faded signs
•
Signs positioned on bends
•
Rotated or damaged signs
•
Concealed or poorly positioned signs
•
Signs completely or partly covered with frost,
snow and/or dirt.
Related information
•
Road Sign Information (RSI)* (p. 244)
•
Road sign information (RSI)* - operation
(p. 245)
248

Driver Alert System*

The Driver Alert System is intended to assist dri-
vers whose driving ability is deteriorating or who
are inadvertently leaving the lane they are driving
on.
The Driver Alert System consists of different
functions which can either be switched on at the
same time or individually:
•
Driver Alert Control - DAC (p. 249).
•
Lane Departure Warning - LDW (p. 251).
A switched-on function is set in standby mode
and is not activated automatically until speed
exceeds 65 km/h (40 mph).
The function is deactivated again when speed
decreases to below 60 km/h (37 mph).
Both functions use a camera which is dependent
on the lane having side markings painted on
each side.
WARNING
Driver Alert System does not work in all situa-
tions but is designed merely as a supplemen-
tary aid.
The driver always bears ultimate responsibility
for ensuring that the vehicle is driven safely.
Related information
•
Driver Alert Control (DAC)* (p. 248)
•
Lane Departure Warning (LDW)* (p. 251)

Driver Alert Control (DAC)*

The DAC function is intended to attract the driv-
er's attention when he/she starts to drive less
consistently, e.g. if he/she becomes distracted
or starts to fall asleep.
The objective for DAC is to detect slowly deterio-
rating driving ability and it is primarily intended for
major roads. The function is not intended for city
traffic.
A camera detects the side markings painted on
the carriageway and compares the section of the
road with the driver's steering wheel movements.
The driver is alerted if the vehicle does not follow
the carriageway evenly.
In some cases driving ability is not affected
despite driver fatigue. In which case there may
not be any warning issued for the driver. For this
reason it is always important to stop and take a
* Option/accessory, for more information, see Introduction.