2020 VOLVO S90 wheel

DRIVER SUPPORT
* Option/accessory.
340
Driver Alert Control
The Driver Alert Control (DAC) function is designed to help alert the driver to erraticbehavior, e.g. if the driver is distracted orshowing signs of fatigue.
The objective of DAC is to detect slowly dete- riorating driving behavior and is primarilyintended to be used on major roads. The func-tion is not intended for use in city traffic. DAC is activated when the vehicle's speed exceeds 65 km/h (40 mph) and remainsactive as long as speeds are above 60 km/h(37 mph).
DAC detects the vehicle's position in the traffic lane.
A camera monitors the traffic lane's marker lines and compares the direction of the roadwith the driver's movements of the steeringwheel.
The vehicle is moving erratically in the lane.
If driving behavior becomes considerably erratic, thedriver will be alerted by thissymbol in the instrumentpanel, an audible signal and the message
Time for a
break.
If the vehicle is equipped with Sensus Navigation * and the Rest Stop Guidancefunction is activated, suggestions will also be provided for suitable places to take a break. The warning will be repeated after a short time if driving behavior does not improve.
WARNING
Driver Alert Control must not be used to extend a period of driving. The drivershould plan in breaks at regular intervalsand make sure they are well rested.
WARNING
An alarm from Driver Alert Control should be taken very seriously since a sleepy driveris often not aware of their own condition. If the alarm sounds or you feel fatigued:
Stop the vehicle safely as soon as pos- sible and rest.
Studies have shown that it is just as dan- gerous to drive while tired as it is to driveunder the influence of alcohol or otherstimulants.

DRIVER SUPPORT
* Option/accessory.
342
Driver Alert Control limitations
Driver Alert Control (DAC) functionality may be reduced in certain situations.
In certain situations, the system may provide a warning even if it has not detected a change indriving behavior, e.g.: in strong crosswinds
on grooved road surfaces.
WARNING
In certain cases, driving behavior might not be affected despite the driver's fatigue – when using the Pilot Assist
* function –
resulting in the driver not getting a warning from DAC. It is therefore very important to always stop and take a break at the slightest signof fatigue, regardless of whether the func-tion has issued a warning or not.
NOTE
The function uses the vehicle's camera and radar sensor, which has certain generallimitations.
Related information
Driver Alert Control (p. 340)
Camera/radar sensor limitations (p. 307)
Lane Keeping Aid
Lane Keeping Aid (LKA 85
) is designed to
actively steer the vehicle on freeways, high- ways and other major roads to help the driverreduce the risk of the vehicle unintentionallyveering out of the lane.
Lake Keeping Aid steers the vehicle back into the lane and/or alerts the driver using vibra-tions in the steering wheel. Lane Keeping Aid is active at speeds between 65–200 km/h (40–125 mph) on roads withclearly visible traffic lane marker lines. On narrow roads, the function may be unavail- able and go into standby mode. The functionwill become available again when the roadbecomes sufficiently wide.
A camera monitors the road/traffic lane's marker lines.
Lane Keeping Aid steers the vehicle back into its lane.
85 Lane Keeping Aid

DRIVER SUPPORT
}}
343
Lane Keeping Aid alerts the driver using vibrations in the steering wheel.
Depending on the settings used, Lane Keep- ing Aid functions in different ways:
Assist enabled: When the vehicle
approaches a lane marker line, the func- tion will actively steer the vehicle back intothe lane using light pressure on the steer-ing wheel.

Warning enabled: If the vehicle is about
to move over a lane marker line, the driver will be alerted by vibrations in the steeringwheel.
There is also an option for activating steeringassistance and alerts at the same time.
NOTE
When the direction indicators/turn signals are activated, the Lane Keeping Aid doesnot provide any warning or intervene withsteering.
WARNING
The function is supplementary driver support intended to facilitate drivingand help make it safer – it cannot han-dle all situations in all traffic, weatherand road conditions.
The driver is advised to read all sec-tions in the Owner's Manual about thisfunction to learn of its limitations,which the driver must be aware ofbefore using the function.
Driver support functions are not a sub-stitute for the driver's attention andjudgment. The driver is always respon-sible for ensuring the vehicle is drivenin a safe manner, at the appropriatespeed, with an appropriate distance toother vehicles, and in accordance withcurrent traffic rules and regulations.
Lane Keeping Aid does not intervene
Lane Keeping Aid does not intervene in sharp inside curves.
In certain cases, such as when a turn signal is used or when "straightening out" an insidecurve, Lane Keeping Aid will not provide steer-ing assistance or alerts.
Hands on the steering wheelSteering assistance with Lane Keeping Aidonly functions if the driver's hands are on thesteering wheel, which the system continu-ously monitors.
If the driver's hands are noton the steering wheel, anaudible signal will be givenand a message will instructthe driver to actively steer thevehicle:
Lane Keeping Aid – Apply steering

||
DRIVER SUPPORT
344If the driver does not begin to steer the vehi- cle, the function will go into standby modeand this message will be displayed:

Lane Keeping Aid – Standby until
steering applied
The function will then be unavailable until the driver begins actively steering the vehicleagain.
Related information
Driver support systems (p. 266)
Activating or deactivating Lane KeepingAid (p. 344)
Lane Keeping Aid limitations (p. 345)
Lane Keeping Aid symbols and messages(p. 346)
Activating or deactivating Lane Keeping Aid
The Lane Keeping Aid (LKA 86
) function is
optional – the driver can choose to have the function activated or deactivated.
Activate or deactivate the function using this button inthe center display's Functionview.
GREEN button indicator light – the func- tion is activated.
GRAY button indicator light – the functionis deactivated.
Related information
Lane Keeping Aid (p. 342)
Selecting type of assistance for LaneKeeping Aid (p. 344)
Lane Keeping Aid limitations (p. 345)
Selecting type of assistance for Lane Keeping Aid
The driver can determine what types of assis- tance Lane Keeping Aid (LKA 87
) should pro-
vide if the vehicle veers from its lane.
1. Select SettingsMy CarIntelliSafein the center display's Top view.
2. Under
Lane Keeping Aid Mode, select
what assistance the function should pro- vide:

Assist the driver will receive steering
assistance but no warning.

Both – the driver receives steering
assistance and a warning through vibrations in the steering wheel.

Warning – the driver is only warned
through vibrations in the steering wheel.
Related information
Lane Keeping Aid (p. 342)
86
Lane Keeping Aid
87 Lane Keeping Aid

DRIVER SUPPORT
345
Lane Keeping Aid limitations
In certain demanding driving conditions, Lane Keeping Aid (LKA 88
) may not be able to prop-
erly assist the driver. In these situations, it is recommended that the function be deacti-vated.
Examples of such situations include:
road work
winter driving conditions
poor road surfaces
a very sporty driving style
bad weather with reduced visibility
roads with indistinct or no lane markings
sharp edges or lines other than the lane's side markings
when speed-dependent power steeringwheel resistance is working at reducedpower – e.g. during cooling due to over-heating.
The function cannot detect barriers, railings orsimilar obstacles at the side of the lane.
NOTE
The function uses the vehicle's camera and radar sensor, which has certain generallimitations.
Related information
Lane Keeping Aid (p. 342)
Speed-dependent steering wheel resis- tance (p. 266)
Camera/radar sensor limitations (p. 307)
88
Lane Keeping Aid

DRIVER SUPPORT
346
Lane Keeping Aid symbols and messages
A number of symbols and messages related to Lane Keeping Aid (LKA 89
) may be dis- played in the instrument panel. Several exam- ples are provided below.
Symbol Message Meaning
Driver support system Reduced functionality Service requiredThe system is not functioning as intended. Contact a workshop
A
.
Windscreen sensor Sensor blocked, see Owner's manualThe camera's ability to detect the lane in front of the vehicle is reduced.
Lane Keeping Aid Apply steeringLKA's steering assistance is disabled when the driver's hands are not on the wheel. Follow the instructions and steer the vehicle.
Lane Keeping Aid Standby until steering appliedLKA will go into standby mode until the driver begins steering the vehicle again.
A An authorized Volvo workshop is recommended.
89 Lane Keeping Aid

DRIVER SUPPORT
347
A text message can be erased by briefly press- ing the
button in the center of the right-
side steering wheel keypad. If a message cannot be erased, contact a workshop A
.
Related information
Lane Keeping Aid (p. 342)
Lane Keeping Aid display (p. 348)
Lane Keeping Aid limitations (p. 345)

DRIVER SUPPORT
* Option/accessory.353
Steering assistance during collision risks limitations
The function may have limited functionality in certain situations and not intervene, e.g.:
for smaller vehicles such as motorcycles
if more than half of your vehicle has moved into the adjacent lane
on roads/lanes with indistinct or no sidelane markings
outside the speed range 60-140 km/h(37-87 mph)
when speed-dependent power steeringwheel resistance is working at reducedpower – e.g. during cooling due to over-heating.
Functionality may also be reduced in other sit-uations, such as: road work
winter driving conditions
narrow roads
poor road surfaces
a very sporty driving style
bad weather with reduced visibility.
In these demanding driving conditions, the function may not be able to properly assist thedriver. In these situations, it is recommendedthat it is turned off.
NOTE
The function uses the vehicle's camera and radar sensor, which has certain generallimitations.
Related information
Steering assistance at risk of collision (p. 349)
Run-Off Mitigation with steering assis-tance (p. 350)
Steering assistance during collision risksfrom oncoming traffic (p. 351)
Steering assistance during collision risks from behind
* (p. 352)