Driver Alert System; Driver Alert Control (Dac) - Introduction - Volvo S80 Owner's Manual

07 Driver support

Driver Alert System

The Driver Alert System is designed to help a
driver who may be becoming fatigued or who
is inadvertently leaving the lane.
Introduction
The Driver Alert System consists of two differ-
ent functions that can be switched on
together or separately.
•
Driver Alert Control (DAC), see Driver
Alert Control (DAC) – introduction
(p. 210)
•
Lane Departure Warning (LDW), see
Lane Departure Warning (LDW) – intro-
duction (p. 215)
When one or both of the functions has been
switched on, it is in standby mode and is acti-
vated when the vehicle exceeds a speed of
40 mph (65 km/h).
The function deactivates if the vehicle's
speed goes under 37 mph (60 km/h).
Both functions use a camera that is depend-
ent on the road/lane being clearly marked by
painted lines on each side.
07
WARNING
The Driver Alert System does not function
in all situations and is designed to be a
supplementary aid. It is not, however,
intended to replace the driver's attention
and judgement.
210
Driver Alert Control (DAC) –
introduction
DAC is intended to alert the driver if his/her
driving becomes erratic, such as if the driver
is distracted or fatigued.
DAC is designed to help detect a slowly
changing driving pattern. It is primarily
intended to be used on main roads and is not
meant for use in city traffic.
A camera monitors the painted lines marking
the lane in which the vehicle is traveling and
compares the direction of the road with the
driver's movements of the steering wheel.
The driver is alerted if the vehicle does not
follow the lane smoothly.
NOTE
The camera has certain limitations, see
Adaptive Cruise Control – limitations
(p. 181).
WARNING
•
DAC is not intended to extend the
duration of driving. Always plan breaks
at regular intervals to help remain alert.
•
A warning from DAC should not be
ignored. A driver may not be aware of
how fatigued he/she has become.
•
In certain cases, fatigue may not affect
the driver's behavior. In situations of
this type, no warning will be provided.
Therefore, it is important to take
breaks at regular intervals, regardless
of whether or not DAC has given a
warning.
Related information
•
Driver Alert Control (DAC) – function
(p. 211)
•
Driver Alert Control (DAC) – operation
(p. 211)
•
Driver Alert Control (DAC) – limitations
(p. 212)
•
Driver Alert Control (DAC) – symbols and
messages (p. 213)