Driver Alert Control (Dac) - Volvo XC 90 Owner's Manual

DRIVER SUPPORT
Roll stability control (RSC)
Volvo's Roll Stability Control (RSC) is a stability
system designed to help minimize the risk of a
rollover in emergency maneuvers or if a skid
should occur.
RSC uses a gyroscopic sensor that registers the
amount of change in the lateral angle at which
the vehicle is leaning. Using this information, RSC
calculates the likelihood of a rollover. If there is
an imminent risk of a rollover, the stability system
is activated, power to the engine is cut and the
brakes are applied to one or more of the wheels
until the vehicle regains stability.
WARNING
The vehicle's stability systems, including RSC,
do not replace the driver's responsibility for
operating the vehicle in a safe manner. Speed
and driving style should always be adapted to
the current road, traffic and weather condi-
tions. Posted speed limits should always be
respected.
Related information
•
Electronic Stability Control (ESC) (p. 302)
•
General safety information (p. 52)
306

Driver Alert Control (DAC)

DAC is intended to alert the driver if his/her driv-
ing becomes erratic due to e.g., distraction or
fatigue.
DAC is designed to help detect a slowly chang-
ing driving pattern. It is primarily intended to be
used on main roads and is not meant for use in
city traffic.
The function activates initially when the vehicle's
speed first exceeds 40 mph (65 km/h) and
remains active as long the speed remains above
approx. 38 mph (60 km/h)
A camera monitors the traffic lane's side marker
lines and compares the direction of the road with
the driver's movements of the steering wheel.
If the driving pattern becomes
noticeably erratic, the driver will
be alerted by an audible signal
Driver Alert Time for a
and
break
will appear in the instru-
ment panel along with a sym-
bol.
The warning will be repeated if the driving pattern
does not change.