Volvo S90 (2021 year). Manual in english - page 20

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DRIVER SUPPORT

346

Lane assistance steers the car back into its lane.

Lane assistance warns with steering wheel vibra-

tions.

Depending on settings, lane assistance acts in
accordance with the following:

•

Assist

 activated: When the car is

approaching a lane line, the function will
actively steer the car back into its lane by

applying a slight torque to the steering
wheel.

•

Warning

 activated: If the car is about to

cross a lane line, the driver is warned by
means of vibrations in the steering wheel.

There is also an option where both steering
assistance and warning are activated simulta-
neously.

NOTE

When a direction indicator/flasher is
switched on, there are no steering correc-
tions or alerts from lane assistance.

WARNING

•

The function is supplementary driver
support intended to facilitate driving
and make it safer – it cannot handle all
situations in all traffic, weather and
road conditions.

•

•

Driver support functions are not a sub-
stitute for the driver's attention and
judgement. The driver is always
responsible for ensuring the car is
driven in a safe manner, at the appro-
priate speed, with an appropriate dis-
tance to other vehicles, and in accord-
ance with current traffic rules and reg-
ulations.

DRIVER SUPPORT

347

Lane assistance does not intervene

Lane assistance does not engage on sharp inside

curves.

In some situations, lane assistance allows lane
lines to be crossed without intervening with
either steering assistance or a warning – e.g.
when using the direction indicators or if the
car is allowed to cut the corners in bends.

Hands on the steering wheel

For steering assistance with lane assistance to
work, the driver must have his/her hands on
the steering wheel, which the system will con-
tinue to monitor.

If the driver does not keep
his/her hands on the steering
wheel, a warning signal is
heard and a message encour-
ages the driver to steer the
car actively:

•

Lane Keeping Aid

 

Apply steering

If the driver follows the prompt to start steer-
ing, the function is set in standby mode and
this message is shown:

•

Lane Keeping Aid

 

Standby until

steering applied

The function will then be unavailable until the
driver starts to steer the car again.

Related information

•

Driving support systems (p. 290)

•

Activating or deactivating lane assistance
(p. 347)

•

Limitations of Lane assistance (p. 348)

•

Symbols and messages for lane assis-
tance (p. 349)

Activating or deactivating lane

assistance

The Lane Keeping Aid (LKA) function (LKA

84

)

is optional – the driver can choose to activate
or deactivate this function.

Activate or deactivate the
function using this button in
the centre display's function
view.

•

GREEN button indication – the function is
activated.

•

GREY button indication – the function is
deactivated.

Related information

•

Lane assistance (p. 345)

•

Selecting assistance option for lane assis-
tance (p. 348)

•

Limitations of Lane assistance (p. 348)

DRIVER SUPPORT

348

Selecting assistance option for

lane assistance

The driver can select how the Lane Keeping
Aid (LKA

85

) should react if the car leaves its

lane.

1. Select 

Settings

My Car

IntelliSafe

in the centre display's top view.

2. In the event of 

Lane Keeping Aid Mode

,

select how the function should react:

•

Assist

 – the driver is given steering

assistance without a warning.

•

Warning

 – the driver is only warned by

steering wheel vibration.

•

Both

 – the driver is given a warning

both from the steering wheel vibrating
and from steering assistance.

Related information

•

Lane assistance (p. 345)

Limitations of Lane assistance

In certain demanding conditions lane assis-
tance (LKA

86

) may have difficulty helping the

driver correctly. In such cases it is recom-
mended to switch off this function.

Examples of such conditions are:

•

road works

•

winter road conditions

•

poor road surface

•

a very “sporty” driving style

•

poor weather with reduced visibility

•

roads with unclear or non-existent side
markings

•

sharp edges or lines other than the lane's
side markings

•

as the steering servo for speed-dependent
steering wheel resistance is working at
reduced power – e.g. when cooling due to
overheating.

The function is unable to detect barriers, rails
or similar obstacles at the side of the carriage-
way.

NOTE

This function uses the car's camera and
radar units, which have certain general lim-
itations.

Related information

•

Lane assistance (p. 345)

•

Speed-dependent steering force (p. 290)

•

Limitations for camera and radar unit
(p. 419)

84

Lane Keeping Aid

85

Lane Keeping Aid

86

Lane Keeping Aid

DRIVER SUPPORT

}}

349

Symbols and messages for lane

assistance

A number of symbols and messages regar-
ding lane assistance (LKA

87

) can be shown

on the driver display. Here are some exam-
ples.

Symbol

Message

Specification

Driver support system

Reduced functionality Service required

The system does not function as it should. A workshop should be contacted

A

.

Windscreen sensor

Sensor blocked, see Owner's manual

The ability of the camera to scan the roadway in front of the car is reduced.

87

Lane Keeping Aid

||

DRIVER SUPPORT

350

Symbol

Message

Specification

Lane Keeping Aid

Apply steering

The LKA steering assistance does not function if the driver does not have his/her
hands on the steering wheel. Follow the instruction and steer the car.

Lane Keeping Aid

Standby until steering applied

LKA is set in standby mode until the driver starts to steer the car again.

A

An authorised Volvo workshop is recommended.

A text message can be cleared by briefly
pressing the 

 button, located in the centre

of the steering wheel's right-hand keypad.

If a message persists, contact a workshop

A

.

Related information

•

Lane assistance (p. 345)

•

Display mode for lane assistance (p. 351)

•

Limitations of Lane assistance (p. 348)

DRIVER SUPPORT

351

Display mode for lane assistance

Lane assistance (LKA

88

) is visualised by sym-

bols in the driver display depending on the
situation.

Here are some examples of
symbols and the situations in
which they are shown:

Available

Available — the lane lines in the symbol are WHITE.

Lane assistance is scanning one or both lane
lines.

Unavailable

Unavailable — the lane lines in the symbol are GREY.

The Lane assistance cannot detect the lane
lines, the speed is too low or the road is too
narrow.

Indication of steering assistance/warning

Steering assistance/warning - the lane lines in the

symbol are COLOURED.

Lane assistance indicates that the system is
giving a warning and/or attempting to steer
the car back into the lane.

Related information

•

Lane assistance (p. 345)

•

Limitations of Lane assistance (p. 348)

88

Lane Keeping Aid

DRIVER SUPPORT

352

City Safety

™

City Safety

89

 can use lights, sound and a

brake pulse warning to alert the driver to
pedestrians, cyclists, larger animals and vehi-
cles.

Function overview

Acoustic signal in the event of a risk of col-
lision
Warning signal in the event of a risk of col-
lision
Distance measurement with the camera
and radar unit

The function can help the driver avoid a colli-
sion when, for example, driving in heavy traf-
fic, where changes in the traffic ahead coupled
with inattentiveness can lead to an incident.
City Safety then activates brief, heavy braking

and the car normally stops just behind the
vehicle in front.

The function helps the driver by automatically
braking the car in the event of an imminent
risk of collision if the driver does not react in
time by braking and/or swerving.

City Safety is activated in situations where the
driver should have started braking earlier,
which is why it cannot help the driver in every
situation. The function is designed to be acti-
vated as late as possible in order to avoid
unnecessary intervention. Automatic braking
takes place only after or at the same time as
the collision warning.

The driver or passengers are not normally
aware of City Safety - it only intervenes in a
situation where a collision is immediately
imminent.

WARNING

•

The function is supplementary driver
support intended to facilitate driving
and make it safer – it cannot handle all
situations in all traffic, weather and
road conditions.

•

•

Driver support functions are not a sub-
stitute for the driver's attention and
judgement. The driver is always
responsible for ensuring the car is
driven in a safe manner, at the appro-
priate speed, with an appropriate dis-
tance to other vehicles, and in accord-
ance with current traffic rules and reg-
ulations.

Related information

•

Driving support systems (p. 290)

•

Subfunctions for City Safety (p. 353)

•

Setting the warning distance for City
Safety (p. 355)

89

The function is not available in all markets.

DRIVER SUPPORT

}}

353

•

Detection of obstacles with City Safety
(p. 356)

•

City Safety brakes for oncoming vehicles
(p. 361)

•

Automatic braking in the event of an impe-
ded evasive manoeuvre with City Safety
(p. 361)

•

City Safety in cross traffic (p. 358)

•

City Safety steering assistance for evasive
manoeuvre (p. 360)

•

Limitations of City Safety (p. 362)

•

Messages for City Safety (p. 365)

Subfunctions for City Safety

City Safety

90

 can help to prevent a collision

or reduce the collision speed. The function
consists of several subfunctions.

Ability to reduce speed

If the speed difference between the driver's
car and the obstacle is greater than the follow-
ing specified speeds, the City Safety auto-
brake function cannot prevent a collision but it
can mitigate the consequences of a collision.

Vehicles

For a vehicle in front, City Safety can reduce
the speed by up to 60 km/h (37 mph).

Cyclists

For a cyclist, City Safety can reduce the speed
by up to 50 km/h (30 mph).

Pedestrians

For a pedestrian, City Safety can reduce speed
by up to 45 km/h (28 mph).

Large animals

In the event of a risk of a collision with a large
animal, City Safety can reduce the car's speed
by up to 15 km/h (9 mph).

The brake function for large animals is primar-
ily intended to reduce the force of the impact
at higher speeds and is most effective at
speeds above 70 km/h (43 mph) but less
effective at lower speed.

The steps of City Safety

City Safety carries out three steps in the fol-
lowing order:

1. Collision warning
2. Brake support
3. Auto Brake

90

The function is not available in all markets.

||

DRIVER SUPPORT

* Option/accessory.

354

1 - Collision warning

The driver is first warned of a potentially immi-
nent collision.

In cars equipped with a head up display

*

, the

warning is shown on the windscreen by a
flashing symbol.

Symbol for collision warning on the windscreen

NOTE

Strong sunlight, reflections, extreme light
contrasts, the use of sunglasses, or if the
driver is not looking straight ahead may
make the visual warning signal in the wind-
screen difficult to recognise.

City Safety can detect pedestrians, cyclists or
vehicles that are stationary or moving in the
same direction as the car and are ahead. City
Safety can also detect pedestrians, cyclists or

large animals that are crossing the road in
front of the car.

In the event of a risk of collision with a pedes-
trian, larger animal, cyclist or vehicle, the
driver is alerted by means of a visual, acoustic
and brake pulse warning. There is no brake
pulse warning at lower speeds, sudden driver
braking or acceleration. The brake pulse fre-
quency varies according to the car's speed.

2 - Brake support

If the risk of collision has increased further
after the collision warning then the brake sup-
port is activated.

Brake support reinforces the driver’s braking
action if the system considers that the braking
is not sufficient to avoid a collision.

3 - Auto Brake

The automatic brake function is activated last.

If in this situation the driver has not yet started
to take evasive action and the risk of collision
is imminent then the automatic braking func-
tion is deployed - this takes place irrespective
of whether or not the driver brakes. Braking
then takes place with full brake force in order
to reduce collision speed, or with limited brake
force if it is sufficient to avoid a collision.

The seatbelt tensioner can be activated in con-
nection with the engagement of the automatic
brake function.

In some situations, the action of Auto-brake
may begin with light braking and then pro-
gress to full brake action.

When City Safety has prevented a collision
with a stationary object, the car remains sta-
tionary in anticipation of positive action by the
driver. If the car has been braked to avoid colli-
sion with a slower vehicle in front, its speed is
reduced to match that of the vehicle in front.

NOTE

On cars with manual gearbox, the engine
stops when the Auto-brake function has
stopped the car, unless the driver has man-
aged to depress the clutch pedal before-
hand.

The driver can always interrupt a braking inter-
vention by firmly depressing the accelerator
pedal.

NOTE

When City Safety brakes, the brake lights
come on.

When City Safety is activated and brakes the
vehicle, the driver display shows a text mes-
sage to the effect that the function is/has
been active.

DRIVER SUPPORT

}}

* Option/accessory.

355

WARNING

City Safety must not be used by the driver

to change his/her driving style - the driver

must not rely on City Safety alone and

allow it to do the braking.

Related information

•

City Safety

™

 (p. 352)

•

City Safety in cross traffic (p. 358)

•

City Safety brakes for oncoming vehicles
(p. 361)

•

Limitations of City Safety (p. 362)

•

Head-up display

*

 (p. 139)

•

Seatbelt tensioner (p. 50)

Setting the warning distance for

City Safety

City Safety

91

 is always activated, but the

driver can select the warning distance for the
function.

NOTE

The City Safety function cannot be deacti-
vated. It is activated automatically when
the engine/electric operation is started and
remains switched on until the engine/elec-
tric operation is switched off.

The warning distance determines the sensitiv-
ity of the system and regulates the distance at
which a visual, acoustic and brake pulse warn-
ing should be deployed.

To select warning distance:

1. Select 

Settings

My Car

IntelliSafe

in the centre display's top view.

2. Under 

City Safety Warning

, select either

Late

, 

Normal

 or 

Early

 to set the desired

warning distance.

If the 

Early

 setting produces too many warn-

ings, which could be perceived as irritating in
certain situations, the 

Normal

 or 

Late

 warn-

ing distance can be selected.

When warnings are perceived as being too
frequent or disturbing, the warning distance
can be reduced, which reduces the total num-
ber of warnings and instead leads to City
Safety giving a warning at a later stage.

The 

Late

 warning distance should therefore

only be used in exceptional cases, as in
dynamic driving.

91

The function is not available in all markets.

||

DRIVER SUPPORT

* Option/accessory.

356

WARNING

•

No automatic system can guarantee
100% correct function in all situations.
Therefore, never test City Safety by
driving at people, animals or vehicles -
this may cause severe damage and
injury and risk lives.

•

City Safety warns the driver when
there is a risk of a collision, but it can-
not shorten the driver’s reaction time.

•

Even if the warning distance has been
set to 

Early

 warnings could be per-

ceived as being late in certain situa-
tions, e.g. when there are large differ-
ences in speed or if vehicles ahead
suddenly brake heavily.

•

With the warning distance set at 

Early

,

the warnings will come more in
advance. This may mean that the warn-
ings come more frequently than at the
warning distance 

Normal

, but it is rec-

ommended since it can make City
Safety more effective.

Related information

•

City Safety

™

 (p. 352)

•

Limitations of City Safety (p. 362)

•

Rear Collision Warning

*

 (p. 372)

Detection of obstacles with City

Safety

City Safety

92

 can help the driver to detect

vehicles, cyclists, large animals and pedes-
trians.

Vehicles

City Safety detect most vehicles that are sta-
tionary or moving in the same direction as the
driver's own car. This function can also detect
oncoming vehicles and cross traffic in certain
cases.

In order that City Safety shall be able to detect
a vehicle in the dark, the vehicle's front and
rear lights must be working and clearly illumi-
nated.

Cyclists

Examples of what City Safety interprets as a cyclist

— with clear body outline and bicycle outline.

Good performance requires that the system
function that detects a cyclist must receive the
clearest possible information about the body
and bicycle outline, requiring the ability to
identify the bicycle, head, arms, shoulders,
legs, upper and lower body plus a normal
human pattern of movement.

If large parts of the cyclist's body or bicycle
are not visible to the function's camera then
the system cannot detect a cyclist.

For the function to be able to detect a cyclist,
he/she must be an adult and riding a bicycle
designed for adults.

92

The function is not available in all markets.

DRIVER SUPPORT

}}

357

WARNING

City Safety is supplementary driver sup-

port, but it cannot detect all cyclists in all

situations and, for example, cannot see:

•

partially obscured cyclists.

•

cyclists if the background contrast for
the cyclists is poor.

•

cyclists wearing clothing that obscures
the body outline.

•

bicycles loaded with large objects.

Warnings and brake interventions could be

late or not occur at all. The driver is always

responsible that the vehicle is driven cor-

rectly and with a safety distance adapted

to the speed.

Pedestrians

Examples of what the system regards as pedestrians

with clear body outlines.

Good performance requires that the system
function that detects a pedestrian must
receive the clearest possible information about
the body outline, requiring the ability to iden-
tify the head, arms, shoulders, legs, upper and
lower body plus a normal human pattern of
movement.

In order that it shall be possible to detect a
pedestrian there must be a contrast with the
background and this will be affected by such
things as clothes, the background and the
weather. With poor contrast the pedestrian
may either be detected late or not at all, which
may mean that warnings and braking are late
or omitted.

City Safety can also detect pedestrians in the
dark if they are illuminated by the car's head-
lamps.

WARNING

City Safety is supplementary driver sup-

port, but it cannot detect all pedestrians in

all situations and, for example, cannot see:

•

partially obscured pedestrians, people
in clothing that hides their body con-
tour or pedestrians shorter than 80 cm
(32 in.).

•

pedestrians if the background contrast
for the pedestrians is poor.

•

pedestrians who are carrying larger
objects.

Warnings and brake interventions could be

late or not occur at all. The driver is always

responsible that the vehicle is driven cor-

rectly and with a safety distance adapted

to the speed.

||

DRIVER SUPPORT

358

Large animals

Examples of what City Safety interprets as large ani-

mals - standing still or walking slowly and with clear

body outline.

Good performance requires that the system
function that detects a large animal (e.g. elk
and horse) must receive the clearest possible
information about the body outline, requiring
the ability to identify the animal directly from
the side in combination with what is a normal
pattern of movement for the animal.

If parts of the animal's body are not visible to
the function's camera then the system cannot
detect the animal.

City Safety can also detect large animals in the
dark if they are illuminated by the car's head-
lamps.

WARNING

City Safety is supplementary driver sup-

port, but it cannot detect all large animals

in all situations and, for example, cannot

see:

•

partially obscured large animals.

•

larger animals seen from the front or
from behind.

•

large animals that run or move quickly.

•

large animals if the background con-
trast for the animals is poor.

•

small animals such as dogs and cats,
for example.

Warnings and brake interventions could be

late or not occur at all. The driver is always

responsible that the vehicle is driven cor-

rectly and with a safety distance adapted

to the speed.

Related information

•

City Safety

™

 (p. 352)

•

Limitations of City Safety (p. 362)

City Safety in cross traffic

City Safety

93

 can help the driver when turn-

ing and crossing the path of another oncom-
ing vehicle at an intersection.

Sector in which City Safety can detect
oncoming crossing vehicles.

For City Safety to detect an oncoming vehicle
on a collision course, the oncoming vehicle
must first enter the sector in which City Safety
can analyse the situation.

93

The function is not available in all markets.

DRIVER SUPPORT

359

The following further criteria must also be ful-
filled:

•

your car must be travelling at no less than
4 km/h (3 mph)

•

your car must turn to the left in markets
with right-hand traffic (or to the right in
left-hand traffic)

•

the oncoming vehicle must have its head-
lamps switched on.

Related information

•

City Safety

™

 (p. 352)

•

Limitations of City Safety (p. 362)

Limitations for City Safety in cross

traffic

In some cases City Safety may have difficulty
helping the driver deal with collision risks due
to oncoming cross traffic.

Examples are:

•

Stability control ESC intervenes in the
event of slippery driving conditions.

•

If the oncoming vehicle is detected too
late.

•

If the oncoming vehicle is obscured by
something.

•

If the oncoming vehicle has headlamps
switched off.

•

If the oncoming vehicle drives in an unpre-
dictable manner, for example, abruptly
changes lanes at a late stage.

NOTE

This function uses the car's camera and
radar units, which have certain general lim-
itations.

Related information

•

City Safety in cross traffic (p. 358)

•

Limitations of City Safety (p. 362)

•

Limitations for camera and radar unit
(p. 419)

DRIVER SUPPORT

360

City Safety steering assistance for

evasive manoeuvre

City Safety steering assistance can help the
driver to steer away from a vehicle/obstacle
when it is not possible to avoid a collision
simply by braking. City Safety steering assis-
tance cannot be switched off, it is always
activated.

Your car steers away.

Slow moving/stationary vehicles or obsta-
cles.

City Safety engages by amplifying the driver's
steering input, which only occurs after the
driver has begun an evasive manoeuvre - and
then only if the driver is not steering enough to
avoid a collision.

In parallel with the amplified steering input,
the brake system is also used to further
amplify the steering input. The function also

helps to straighten the car again after passing
the obstacle.

City Safety steering assistance can detect:

•

Vehicles

•

cyclists

•

Pedestrians

•

larger animals.

Related information

•

City Safety

™

 (p. 352)

•

Limitations of City Safety steering assis-
tance when taking evasive action (p. 360)

•

Limitations of City Safety (p. 362)

Limitations of City Safety steering

assistance when taking evasive

action

City Safety may have limited functionality in
certain situations and fail to intervene e.g.:

•

outside the speed range 50-100 km/h
(30-62 mph)

•

if the driver initiates an evasive manoeuvre

•

if the steering servo creating speed-
dependent steering wheel resistance is
working at reduced power – e.g. when
cooling due to overheating.

NOTE

This function uses the car's camera and
radar units, which have certain general lim-
itations.

Related information

•

City Safety steering assistance for evasive
manoeuvre (p. 360)

•

Limitations of City Safety (p. 362)

•

Speed-dependent steering force (p. 290)

•

Limitations for camera and radar unit
(p. 419)

DRIVER SUPPORT

}}

361

Automatic braking in the event of

an impeded evasive manoeuvre

with City Safety

City Safety

94

 has the facility to assist the

driver by automatically braking the car earlier
when it is not possible to avoid a collision by
only steering away.

City Safety assists the driver by continuously
attempting to anticipate whether there are
"escape routes" to the side in case a slow or
stationary vehicle ahead is discovered at a late
stage.

Your car (1) "sees" no options for evading the vehicle

ahead (2) and can therefore auto-brake earlier.

Your car

Slow/stationary vehicle

City Safety does not intervene with the auto-
brake function as long as the driver him/
herself has the opportunity to avoid a collision
via a steering manoeuvre.

However, if City Safety anticipates that an
evasive manoeuvre is not possible due to traf-
fic in an adjacent lane, the function can assist
the driver by automatically starting to brake at
an earlier stage.

Related information

•

City Safety

™

 (p. 352)

•

Limitations of City Safety (p. 362)

City Safety brakes for oncoming

vehicles

City Safety can assist the driver to use emer-
gency braking for an oncoming vehicle in
your car's lane.

If an oncoming vehicle enters your car's lane
and a collision is unavoidable, City Safety can
reduce the car's speed with a view to reducing
the violence of the impact.

Your car

Oncoming vehicles

94

The function is not available in all markets.