Volvo V70 (2016 year). Instruction - part 13

Distance Warning* - limitations (p. 221)

The higher the speed the longer the calcu-

lated distance in metres for a given time

interval.
The set time interval is also used by the

function adaptive cruise control (p. 206).
Only use the time intervals permitted by

local traffic regulations.

Related information

•

•

Distance Warning* - symbols and mes-

sages (p. 222)

Distance Warning* - limitations

This function, which uses the same radar

sensor as Adaptive cruise control (p. 205) and

Collision warning with auto brake (p. 230),

has certain limitations.

tions, see Radar sensor - limitations (p. 215)

Strong sunlight, reflections or strong varia-

tions in light intensity, as well as wearing

sunglasses, could mean that the warning

light in the windscreen cannot be seen.
Poor weather or winding roads could

affect the radar sensor's capacity to detect

vehicles in front.
The size of other vehicles could also affect

detection capacity, e.g. motorcycles. This

could mean that the warning lamp illumi-

nates at a shorter distance than the setting

or that the warning is temporarily absent.
Extremely high speeds can also cause the

lamp to illuminate at a shorter distance

than that set due to limitations in sensor

range.

For further information on radar sensor limita-

and (p. 235).

Related information

•

Distance Warning* (p. 220)

•

Distance Warning* - symbols and mes-

sages (p. 222)

07 Driver support

222

Option/accessory, for more information, see Introduction.

Distance Warning* - symbols and

messages

The function has certain symbols and mes-

sages that can be shown in the combined

instrument panel if the function is reduced

due to its limitations.

Symbol

Message

Specification

Radar blocked See

manual

Distance Warning temporarily disengaged.
The radar sensor is blocked and cannot detect other vehicles, e.g. in the event of heavy rain or if slush

has collected in front of the radar sensor.
Read about radar sensor limitations (p. 215).

Collision warning

Service required

Distance Warning and Collision Warning with Auto Brake fully or partially disengaged.
Visit a workshop if the message remains - an authorised Volvo workshop is recommended.

Symbols are schematic - may vary by market and car model.

Related information

•

Distance Warning* (p. 220)

•

Distance Warning* - limitations (p. 221)

07 Driver support

}}

Option/accessory, for more information, see Introduction.

223

City Safety™

City Safety™ is a function for helping the

driver to avoid a collision when driving in

queues, amongst other things, when changes

in the traffic ahead, combined with a lapse in

attention, could lead to an incident.

The City Safety™ function is active at speeds

under 50 km/h and it helps the driver by auto-

matically braking the car in the event of immi-

nent risk of collision with vehicles in front,

should the driver not react in time by braking

and/or steering away.
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.
City Safety™ is designed to be activated as

late as possible in order to avoid unnecessary

intervention.
City Safety™ must not be used as an excuse

for the driver to change his/her driving style. If

the driver solely relies on City Safety™ to do

the braking, there will be a collision sooner or

later.
The driver or passengers normally only notice

City Safety™ if a situation arises where the

car is extremely close to being in a collision.
If the car is also equipped with Collision

Warning with Auto Brake (p. 230)* these two

systems complement each other.

IMPORTANT

Maintenance and replacement of City

Safety™ components must only be per-

formed by a workshop - an authorised

Volvo workshop is recommended.

WARNING

City Safety™ does not engage in all driv-

ing situations or traffic, weather or road

conditions.
City Safety™ does not react to vehicles

driving in a different direction from the car,

to small vehicles and motorcycles or to

humans and animals.
City Safety™ can prevent collision at a

speed difference of less than 15 km/h - at

a higher speed difference, it is only possi-

ble to reduce collision speed. In order to

obtain full brake function, the driver must

depress the brake pedal.
Never wait for City Safety™ to engage.

The driver always bears responsibility for

maintaining the proper distance and

speed.

Related information

•

•

•

•

•

City Safety™ - function

City Safety detects the traffic in front of the

car with a laser sensor fitted in the top edge

of the windscreen. If there is an imminent risk

of collision, City Safety will automatically

brake the car, which may be experienced as

heavy braking.

07 Driver support

224

Laser sensor transmitter and receiver window

If the speed difference is 4-15 km/h in relation

to the vehicle in front then City Safety can

completely avoid a collision.
City Safety activates a short, sharp braking

procedure and stops the car in normal cir-

cumstances, just behind the vehicle in front.

For most drivers this is well outside normal

driving style and may be experienced as

being uncomfortable.
If the difference in speed between the vehi-

cles is greater than 15 km/h then City Safety

may not avoid the collision on its own - to

obtain full brake force, the driver must

depress the brake pedal and this could then

make it possible to avoid a collision, even at

speed differences above 15 km/h.

When the function is activated and brakes,

the combined instrument panel shows a text

message to the effect that the function is/has

been active.

When City Safety™ brakes, the brake

lights come on.

Related information

•

•

•

•

•

City Safety™ - operation

City Safety™ is a function for helping the

driver to avoid a collision when driving in

queues, amongst other things, when changes

in the traffic ahead, combined with a lapse in

attention, could lead to an incident.

On and Off

The City Safety™ function is activated

automatically when the engine is started.

In certain situations, it may advisable to disa-

ble City Safety™, e.g. where leafy branches

could sweep over the bonnet and/or wind-

screen.
City Safety™ handled in the menu system

MY CAR (p. 116) and after starting the engine

the function can be deactivated as follows:

•

Search in MY CAR for

Driver support

system

and select the

Off

option at

City

Safety

However, the function will be enabled the

next time the engine is started, regardless

of whether the system was enabled or

disabled when the engine was switched

off.

NOTE: The illustration is schematic - details may vary depending on car model.

07 Driver support

}}

225

WARNING

The laser sensor also transmits laser light

when City Safety™ is disabled manually.

Related information

•

•

•

•

•

•

MY CAR (p. 116)

City Safety™ - limitations

The sensor in City Safety is designed to

detect cars and other large vehicles in front of

the car irrespective of whether it is day or

night.
However, the function does have some limita-

tions.

The sensor's limitations mean that City Safety

has poorer functionality - or none at all - in

e.g. heavy snowfall or rain, dense fog, dust

storms or white-out situations. Misting, dirt,

ice or snow on the windscreen may also dis-

rupt the function.
Low-hanging objects, e.g. a flag/pennant for

projecting load, or accessories such as auxili-

ary lamps and bull bars that are higher than

the bonnet limit the function.
The laser beam from the sensor in City Safety

measures how the light is reflected. The sen-

sor cannot detect objects with low reflection

capacity. The rear sections of the vehicle

generally reflect the light sufficiently thanks to

the number plate and rear light reflectors.
On slippery road surfaces the braking dis-

tance is extended, which may reduce the

capacity of City Safety to avoid a collision. In
such situations the ABS

and ESC

systems

will provide best possible braking force with

maintained stability.

When your own car is reversing, City Safety is

temporarily deactivated.
City Safety is not activated at low speeds -

under 4 km/h, which is why the system does

not intervene in situations where a vehicle in

front is being approached very slowly, e.g.

when parking.
Driver commands are always prioritised,

which is why City Safety does not intervene in

situations where the driver is steering or

accelerating in a clear manner, even if a colli-

sion is unavoidable.
When City Safety has prevented a collision

with a stationary object the car remains sta-

tionary for a maximum of 1.5 seconds. If the

car is braked for a vehicle in front that is mov-

ing, then speed is reduced to the same speed

as that maintained by the vehicle in front.
On a car with manual gearbox the engine

stops when City Safety has stopped the car,

unless the driver manages to depress the

clutch pedal beforehand.

(Anti-lock Braking System) - Anti-lock braking system.

(Electronic Stability Control) - Stability system.

07 Driver support

226

and dirt (see the illustration for sensor

•

Keep the windscreen surface in front

of the laser sensor free from ice, snow

location (p. 223)).

•

Do not affix or mount anything on the

windscreen in front of the laser sensor.

•

Remove ice and snow from the bonnet

- snow and ice must not exceed a

height of 5 cm.

Fault tracing and action
If the message

Windscreen sensors

blocked See manual

is shown in the com-

bined instrument panel it indicates that the

laser sensor is blocked and cannot detect

vehicles in front of the car. This means in turn

that City Safety is not operational.
The

Windscreen sensors blocked See

manual

message is not shown for all situa-

tions in which the laser sensor is blocked.

The driver must therefore be diligent about

keeping the windscreen and area in front of

the laser sensor clean.
The following table presents possible causes

for the message being shown, along with

suggestions for appropriate action.

Cause

Action

The windscreen sur-

face in front of the

laser sensor is dirty or

covered with ice or

snow.

Clean the wind-

screen surface in

front of the sensor

from dirt, ice and

snow.

The laser sensor field

of vision is blocked.

Remove the

blocking object.

IMPORTANT

If there are cracks, scratches or stone

chips in the windscreen in front of either of

the laser sensor's "windows" and they

cover a surface of approx. 0.5 x 3.0 mm

(or larger), then a workshop must be con-

tacted for replacement of the windscreen

(see the illustration for sensor location

(p. 223)) - an authorised Volvo workshop is

recommended.
Failure to take action may result in

reduced performance for City Safety™.
To avoid the risk of failed, deficient or

reduced operation for City Safety™, the

following also applies:

•

Volvo recommends that you do not

repair cracks, scratches or stone chips

in the area in front of the laser sensor -

instead, the whole windscreen should

be replaced.

•

Before replacing a windscreen, con-

tact an authorised Volvo workshop to

verify that the correct windscreen is

ordered and fitted.

•

The same type or Volvo-approved

windscreen wipers must be fitted dur-

ing replacement.

Related information

•

•

•

which transmits laser light (see illustration

07 Driver support

}}

227

City Safety™ - laser sensor

The City Safety™ function includes a sensor

(p. 223) for sensor location). Contact a quali-

fied workshop in the event of a fault or if the

laser sensor needs servicing - an authorised

Volvo workshop is recommended. It is abso-

lutely essential to follow the prescribed

instructions when handling the laser sensor.

The following two labels relate to the laser

sensor:

The upper label in the figure describes the

laser beam's classification:

•

Laser radiation - Do not look into the

laser beam with optical instruments -

Class 1M laser product.

The lower label in the figure describes the

laser beam's physical data:

•

IEC 60825-1:1993 + A2:2001. Complies

with FDA (U.S. Food Administration)

standards for laser product design with

the exception of deviations in accordance

with "Laser Notice No. 50" from

26 July 2001.

Radiation data for the laser sensor
The following table specifies the laser sen-

sor's physical data.

Maximum pulse energy

2.64

µJ

Maximum average output

45 mW

Pulse duration

33 ns

Divergence (horizontal x verti-

cal)

28° × 12°

WARNING

If any of these instructions are not followed

then there is a risk of eye injury!

•

Never look into the laser sensor (which

emits spreading invisible laser radia-

tion) at a distance of 100 mm or closer

with magnifying optics such as a mag-

nifying glass, microscope, lens or simi-

lar optical instruments.

•

Testing, repair, removal, adjustment

and/or replacement of the laser sen-

sor's spare parts must only be carried

out by a qualified workshop - we rec-

ommend an authorised Volvo work-

shop.

•

To avoid exposure to harmful radia-

tion, do not carry out any readjust-

ments or maintenance other than

those specified here.

•

The repairer must follow specially

drawn up workshop information for the

laser sensor.

•

Do not remove the laser sensor (this

includes removing the lenses). A

removed laser sensor does not fulfil

laser class 3B as per standard IEC

60825-1. Laser class 3B is not eye-

safe and therefore entails a risk of

injury.

•

The laser sensor's connector must be

unplugged before removal from the

windscreen.

07 Driver support

228

•

The laser sensor must be fitted onto

the windscreen before the sensor's

connector is plugged in.

•

The laser sensor transmits a laser light

when the remote control key is in key

position II (p. 81) even if the engine is

switched off.

Related information

•

•

•

•

•

City Safety™ (p. 223) system, one or more

07 Driver support

229

City Safety™ - symbols and

messages

In conjunction with automatic braking by the

symbols may illuminate in the combined

instrument panel and a text message may be

shown. A text message can be acknowledged

by briefly pressing the OK button on the

direction indicator stalk.

Symbol Message

Meaning/Action

Auto braking by City Safety

City Safety™ is braking or has automatically braked.

Windscreen sensors blocked

See manual

The laser sensor is temporarily non-operational because something is blocking it.

•

Remove the object blocking the sensor and/or clean the windscreen in front of the sensor.

Read about laser sensor limitations (p. 225).

City Safety Service required

City Safety™ is not operational.

•

Visit a workshop if the message remains - an authorised Volvo workshop is recommended.

Related information

•

•

•

•

•

Collision warning system* - function

07 Driver support

230

Option/accessory, for more information, see Introduction.

Collision warning system*

"Collision Warning with Auto Brake and

Cyclist and Pedestrian Detection" is an aid to

assist the driver when there is a risk of collid-

ing with a pedestrian, cyclist or vehicle in

front that are stationary or moving in the same

direction.

"Collision Warning with Auto Brake and

Cyclist and Pedestrian Detection" is activated

in situations where the driver should have

started braking earlier, which is why it cannot

help the driver in every situation.
"Collision Warning with Auto Brake and

Cyclist and Pedestrian Detection" is designed

to be activated as late as possible in order to

avoid unnecessary intervention.
"Collision Warning with Auto Brake and

Cyclist and Pedestrian Detection" can pre-

vent a collision or reduce collision speed.
"Collision Warning with Auto Brake and

Cyclist and Pedestrian Detection" must not

be used as an excuse for the driver to change

his/her driving style. If the driver solely relies

on Collision Warning with Auto Brake to do

the braking, there might be a risk of a colli-

sion sooner or later.

Two system levels
Depending on how the car is equipped, the

"Collision Warning with Auto Brake and

Cyclist and Pedestrian Detection" function

may appear in two variants:

Level 1

The driver is merely warned

of occurring

obstacles by means of visual and acoustic

signals - no automatic braking intervenes, the

driver must himself brake.

Level 2

The driver is warned of occurring obstacles

by means of visual and acoustic signals - the

car is braked automatically if the driver him-

self does not act within a reasonable time.

IMPORTANT

Maintenance of the internal components of

the "Collision Warning with Auto Brake

and Cyclist and Pedestrian Detection"

must only be performed at a workshop -

an authorised Volvo workshop is recom-

mended.

Related information

•

(p. 231)

•

Collision warning system* - detection of

pedestrians (p. 233)

•

Collision warning system* - detection of

cyclists (p. 232)

•

Collision warning system* - operation

(p. 234)

•

Collision warning system* - limitations

(p. 235)

•

Collision warning system* - camera sen-

sor limitations (p. 236)

•

Collision warning system* - symbols and

messages (p. 238)

Not available as an option for certain engines.

No warning for cyclists with "Level 1".

07 Driver support

}}

Option/accessory, for more information, see Introduction.

231

Collision warning system* - function

Function overview

Audio-visual warning signal in the event

of a collision risk.
Radar sensor

Camera sensor

Collision Warning with Auto Brake executes

three steps in the following order:
1. Collision warning
2. Brake support

3. Auto Brake

The collision warning system and City

Safety™ (p. 223) complement each other.

1 - Collision warning
The driver is first warned of a potentially

imminent collision.
The collision warning system can detect

pedestrians, cyclists or vehicles that are sta-

tionary or moving in the same direction in

front of the driver's vehicle.
If there is a risk of collision with a pedestrian,

cyclist or a vehicle then the driver's attention

is attracted with a flashing red warning signal

(1) and an acoustic signal.

2 - Brake support

If the risk of collision has increased further

after the collision warning then the brake sup-

port is activated.
This means that the brake system is prepared

for rapid braking by applying the brakes

lightly, which may feel like a slight jolt.
If the brake pedal is depressed sufficiently

quickly then full brake function is imple-

mented.
Brake support also reinforces the driver's

braking if the system considers that the brak-

ing 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 brak-

ing function 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. For cyclists, the warning and

full brake intervention may come very late or

simultaneously.

NOTE: The illustration is schematic - details may vary depending on car model.

With system Level 2 only.

07 Driver support

232

Option/accessory, for more information, see Introduction.

WARNING

The collision warning system does not

engage in all driving situations or traffic,

weather or road conditions. The collision

warning system does not react to vehicles

or cyclists driving in another direction to

the car or to animals.
Warning only activated in the event of a

high risk for collision. This section "Func-

tion" and the section "Limitations" inform

about limitations that the driver must be

aware of before using the Collision Warn-

ing system with Auto Brake.
Warnings and brake interventions for

pedestrians and cyclists are deactivated at

a vehicle speed exceeding 80 km/h.
Warnings and brake interventions for

pedestrians and cyclists do not work in

darkness and tunnels - not even when

streetlights are lit.
The auto-brake function can prevent a col-

lision or reduce collision speed. To ensure

full brake performance, the driver should

always depress the brake pedal - even

when the car auto-brakes.
Never wait for a collision warning. The

driver is always responsible that the cor-

rect distance and speed are maintained -

even when the collision warning system

with auto-brake is used.

Related information

•

Collision warning system* - detection

of cyclists

The function only "sees" cyclists from behind,

who are travelling in the same direction.

Optimum examples of what the system interprets

as a cyclist - with clear body and bicycle con-

tours, directly from behind and in the car's cen-

tre line.

Optimal performance of the system requires

that the system function that detects a cyclist

receives as unambiguous information as pos-

sible about the body and bicycle contours -

this implies the opportunity to identify the

bicycle, head, arms, shoulders, legs, upper

and lower body combined with 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 rid-

ing an "adult bicycle".

•

The bicycle must be equipped with a
highly visible and approved

rearward-

facing red reflector, fitted at least 70 cm

above the roadway.

•

The function can only detect cyclists

directly from behind and who are travel-

ling in the same direction - not at an

angle from behind, not from the side.

•

Cyclists travelling on the left or right-hand

edge of the car's imagined/extended side

lines may be detected late or not at all.

•

The function's capacity to detect cyclists

at dusk and dawn is limited - just like the

human eye.

The reflector must fulfil the recommendations and conditions of the traffic authority in the market in question.

07 Driver support

Option/accessory, for more information, see Introduction.

233

•

The function's capacity to detect cyclists

is deactivated when driving in darkness

and tunnels - even when streetlights are

lit.

•

For optimum bicycle detection, the City

Safety™ function must be activated, see

City Safety™ (p. 223).

WARNING

Collision Warning with Auto Brake &

Cyclist Detection is a means of assistance.
The function cannot detect:

•

all cyclists in all situations and does

not see partially obscured cyclists, for

example.

•

cyclists in clothing that obscures the

contours of the body or who are

approaching from the side.

•

bicycles that have no rearward-facing

red reflector.

•

bicycles loaded with large objects.

The driver is always responsible that the

vehicle is driven properly and with a safety

distance adapted to the speed.

Related information

•

Collision warning system* - detection

of pedestrians

Optimal examples of what the system regards as

pedestrians with clear body contours.

Optimal performance of the system requires

that the system function that detects pedes-

trians receives as unambiguous information

as possible about the contours of the body -

this implies the opportunity to identify the

head, arms, shoulders, legs, upper and lower

body combined with a normal human pattern

of movement.
If large parts of the body are not visible to the

function's camera then the system cannot

detect a pedestrian.

•

In order for a pedestrian to be detected

he/she must appear full-length and have

a height of at least 80 cm.

•

The camera sensor's ability to see pedes-

trians at dusk and dawn is limited - just

like the human eye.

•

The camera sensor's capacity to detect

pedestrians is deactivated when driving in

darkness and tunnels - even when street-

lights are lit.

WARNING

"Collision Warning with Auto Brake and

Cyclist and Pedestrian Detection" is a

means of assistance. The function cannot

detect all pedestrians in all situations and

does not see, for example:

•

partially obscured pedestrians, people

in clothing that hides their body con-

tour or pedestrians shorter than

80 cm.

•

pedestrians who are carrying larger

objects.

The driver is always responsible that the

vehicle is driven properly and with a safety

distance adapted to the speed.

Related information

•

07 Driver support

234

Option/accessory, for more information, see Introduction.

Collision warning system* - operation

Warning signals On and Off

1. Acoustic and visual warning signal in the event

of a collision risk.

You can select whether the collision warning

system's acoustic and visual warning signals

should be switched on or off.
When starting the engine, the setting that was

selected when the engine was switched off is

obtained automatically.

(p. 116) - and there select On or Off.

The Brake Support and Auto Brake func-

tions are always enabled - they cannot be

deactivated.

Settings for the collision warning system are

made via the centre console's screen and the

menu system MY CAR, see (p. 116).

Light and acoustic signals

When the collision warning system's light and

acoustic warnings are activated, the warning

lamp (no. [1] in previous illustration) is tested

each time the engine is started by briefly illu-

minating the warning lamp's separate points

of light.
After starting the engine, both the light and

acoustic signals can be switched off:

•

Search for

Collision warning

Driver

support system

in the menu system MY

CAR (p. 116) - and there select to

uncheck the function.

Acoustic signal

After starting the engine the warning sound

can be activated/deactivated separately:

•

Search for

Warning sound

Collision

warning

in the menu system MY CAR

Following which, the collision warning system

is only indicated with a light signal.

Set warning distance
The warning distance regulates the distance

at which the visual and acoustic warnings are

deployed.

•

Search for

Warning distance

Collision warning

in the menu system

MY CAR (p. 116) - and there select

Long

Normal

Short

The warning distance determines the sys-

tem's sensitivity. Warning distance

Long

pro-

vides an earlier warning. First test with

Long

and if this setting produces too many warn-

ings, which could be perceived as irritating in

certain situations, then change to warning

distance

Normal

Only use warning distance

Short

in excep-

tional cases, e.g. for dynamic driving.

be effective, always drive with Distance

When the adaptive cruise control is in use

the warning lamp and warning sound will

be used by the cruise control even if the

collision warning system is switched off.
The collision warning system warns the

driver in the event of a risk of a collision,

but the function cannot shorten driver

reaction time.
In order for the collision warning system to

Warning (p. 220) set at time interval 4–5.

The illustration is schematic - car model and details may differ.

07 Driver support

}}

Option/accessory, for more information, see Introduction.

235

centre console's screen and the menu sys-

Even if the warning distance has been set

Long

warnings could be perceived as

being late in certain situations, e.g. when

there are large differences in speed or if

vehicles in front brake heavily.

WARNING

No automatic system can guarantee

100 % correct function in all situations.

Therefore, never test Collision Warning

with Auto Brake by driving at people or

vehicles - this may cause severe damage

and injury and risk lives.

Checking settings
The current settings can be controlled via the

tem (p. 116) MY CAR.

Maintenance

Camera and radar sensor

For the sensors to work correctly, they must

be kept clear of dirt, ice and snow, and be

cleaned regularly with water and car sham-

poo.

Dirt, ice and snow covering the sensors

will reduce their function and may prevent

measurement.

Related information

•

signal (see (1) in the illustration (p. 231)) may

Collision warning system* - limitations

The function has certain limitations - for

example, it is not active until approx. 4 km/h.

The collision warning system's visual warning

be difficult to notice in the event of strong

sunlight, reflections, when sunglasses are

being worn or if the driver is not looking

straight ahead. The warning sound should

therefore always be activated.
On slippery road surfaces the braking dis-

tance is extended, which may reduce the

capacity to avoid a collision. In such situa-

tions the ABS and ESC (p. 196) systems will

provide best possible braking force with

maintained stability.

radar sensors as the Adaptive cruise control

The visual warning signal can be temporar-

ily disengaged in the event of high passen-

ger compartment temperature caused by

strong sunlight for example. If this occurs

then the warning sound is activated even if

it is deactivated in the menu system.

•

Warnings may not appear if the dis-

tance to the vehicle in front is small or

if steering wheel and pedal move-

ments are large, e.g. a very active driv-

ing style.

NOTE: The illustration is schematic - details may vary depending on car model.

07 Driver support

236

Option/accessory, for more information, see Introduction.

WARNING

Warnings and brake interventions could be

implemented late or not at all if the traffic

situation or external influences mean that

the radar or camera sensor cannot detect

a pedestrian, a vehicle or a cyclist in front

correctly.
The sensor system has a limited range for

pedestrians and cyclists

- the system

can provide effective warnings and brake

interventions for them at vehicle speeds up

to 50 km/h. For stationary or slow-moving

vehicles, warnings and brake interventions

are effective at vehicle speeds up to

70 km/h.
Warnings for stationary or slow-moving

vehicles could be disengaged due to dark-

ness or poor visibility.
Warnings and brake interventions for

pedestrians and cyclists are deactivated at

vehicle speeds exceeding 80 km/h.

The collision warning system uses the same

tations (p. 215).
If warnings are perceived as being too fre-

quent or disturbing then the warning distance

can be reduced (p. 234). This would lead to

the system warning at a later stage, which

reduces the total number of warnings.

Collision Warning with Auto Brake is tempo-

rarily deactivated with reverse gear engaged.
Collision Warning with Auto Brake is not acti-

vated at low speeds - under 4 km/h, which is

why the system does not intervene in situa-

tions where the car is approaching a vehicle

in front very slowly, e.g. when parking.
In situations where the driver demonstrates

active, aware driving behaviour, a collision

warning may be postponed slightly in order to

keep unnecessary warnings to a minimum.
When Auto Brake has prevented a collision

with a stationary object the car remains sta-

tionary for a maximum of 1.5 seconds. If the

car is braked for a vehicle in front that is mov-

ing, then speed is reduced to the same speed

as that maintained by the vehicle in front.
On a car with manual gearbox the engine

stops when Auto Brake has stopped the car,

unless the driver manages to depress the

clutch pedal beforehand.

Related information

•

Road sign information (p. 200)

Collision warning system* - camera

sensor limitations

"Collision Warning with Auto Brake and

Cyclist and Pedestrian Detection" is an aid to

assist the driver when there is a risk of collid-

ing with a pedestrian, bicycle or vehicle in

front that are stationary or moving in the same

direction.
The function uses the car's camera sensor,

which has certain limitations.

The car’s camera sensor is also used - as

well as by Collision Warning with Auto Brake

- by the functions:

•

Active main beam (p. 93)

•

•

Driver Alert Control - DAC (p. 240)

•

Lane assistance (p. 243)