To prevent damage to the vehicle, deacti-
vate DISTRONIC PLUS and the HOLD func-
tion in the following or other similar situa-
tions: R
when towing the vehicle R
in the car wash
If you fail to adapt your driving style,
DISTRONIC PLUS can neither reduce the risk
of accident nor override the laws of physics.
DISTRONIC PLUS cannot take into account
the road, traffic and weather conditions.
DISTRONIC PLUS is only an aid. You are
responsible for the distance to the vehicle in
front, for vehicle speed, for braking in good
time and for staying in your lane.
Do not use DISTRONIC PLUS: R
in road and traffic conditions which do not
allow you to maintain a constant speed, e.g.
in heavy traffic or on winding roads R
on slippery road surfaces. Braking or accel-
erating could cause the drive wheels to lose
traction and the vehicle could then skid R
when there is poor visibility, e.g. due to fog,
heavy rain or snow
DISTRONIC PLUS may not detect narrow
vehicles driving in front, e.g. motorcycles, or
vehicles driving on a different line.
In particular, the detection of obstacles can
be impaired if: R
there is dirt on the sensors or anything else
covering the sensors R
there is snow or heavy rain R
there is interference by other radar sources R
there are strong radar reflections, for
example, in parking garages
If DISTRONIC PLUS no longer detects a vehi-
cle in front, DISTRONIC PLUS may unexpect-
edly accelerate the vehicle to the stored
speed. This speed may: R
be too high if you are driving in a filter lane
or an exit lane R
be so high when driving in the right-hand
lane that you overtake vehicles in the left-
hand lane R
be so high when driving in the left-hand lane
that you overtake vehicles in the right-hand
lane
If there is a change of drivers, advise the new
driver of the speed stored.
Cruise control lever
C
To activate or increase speed D
To activate or reduce speed
Otherwise Active Parking Assist will be can-
celed.
Active Parking Assist brakes the vehicle to
a standstill when the vehicle approaches
the rear border of the parking space.
Maneuvering may be required in tight park-
ing spaces.
The Park Assist Active Select D
Observe Surroundings message appears in
the multifunction display. X
Shift the transmission to position D while
the vehicle is stationary.
Active Parking Assist immediately steers in
the other direction.
The Park Assist Active Accelerate
and Brake Observe Surroundings mes-
sage appears in the multifunction display.
i You will achieve the best results by wait-
ing for the steering procedure to complete
before pulling away. X
Drive forwards and be ready to brake at all
times.
Active Parking Assist brakes the vehicle to
a standstill when the vehicle approaches
the front border of the parking space.
Maneuvering may be required in tight park-
ing spaces.
The Park Assist Active Select R
Observe Surroundings message appears in
the multifunction display.
As soon as the parking procedure is com-
plete, the Park
Assist Switched Off mes-
sage appears and a warning tone sounds. The
vehicle is now parked.
The vehicle is kept stationary without the
driver having to depress the brake pedal. The
braking effect is canceled when you depress
the accelerator pedal.
Active Parking Assist no longer supports you
with steering interventions and brake appli-
cations. When Active Parking Assist is fin-
ished, you must steer and brake again your-
self. PARKTRONIC is still available. Parking tips: R
The way your vehicle is positioned in the
parking space after parking is dependent
on various factors. These include the posi-
tion and shape of the vehicles parked in
front and behind it and the conditions of the
location. It may be the case that Active
Parking Assist guides you too far into a
parking space, or not far enough into it. In
some cases, it may also lead you across or
onto the curb. If necessary, you should can-
cel the parking procedure with Active Park-
ing Assist. R
You can also select preselect transmission
position D . The vehicle redirects and does
not drive as far into the parking space.
Should the transmission change take place
too early, the parking procedure will be
canceled. A sensible parking position can
no longer be achieved from this position.
Exiting a parking space In order that Active Parking Assist can sup-
port you when you exit the parking space: R
you need to have parked using Active Park-
ing Assist. R
the border of the parking space must be
high enough at the front and the rear. A
curb is too small, for example. R
the border of the parking space must not be
too wide, as the position of the vehicle must
not exceed an angle of 45° to the starting
position as it is maneuvering into the park-
ing space. R
a maneuvering distance of at least 3.3 ft
(1.0 m) must be available.
Active Parking Assist can only assist you with
exiting a parking space if you have parked the
vehicle parallel to the direction of travel using
Active Parking Assist.
i If PARKTRONIC detects obstacles, Active
Parking Assist brakes automatically whilst
the vehicle exits the parking space. You are
responsible for braking in good time.206
Driving systems
Driving and parking
The functionality of ATTENTION ASSIST is
restricted and warnings may be delayed or
not occur at all: R
if the length of the journey is less than
approximately 30 minutes R
if the road condition is poor, e.g. if the sur-
face is uneven or if there are potholes R
if there is a strong side wind R
if you have adopted a sporty driving style
with high cornering speeds or high rates of
acceleration R
if you are predominantly driving slower
than 37 mph (60 km/h) or faster than
125 mph (200 km/h) R
if the time has been set incorrectly R
in active driving situations, such as when
you change lanes or change your speed
ATTENTION ASSIST is reset when you con-
tinue your journey and starts assessing your
tiredness again if: R
you switch off the engine R
you take off your seat belt and open the
driver's door, e.g. for a change of drivers or
to take a break
Displaying the attention level
You can have current status information dis-
played in the assistance menu ( Y
page 227)
of the on-board computer. X
Select the Assistance display for Attention
Assist using the on-board computer
( Y
page 227). The following information is displayed: R
length of the journey since the last break. R
the attention level determined by ATTEN-
TION ASSIST ( Attention Level
), dis-
played in a bar display in five levels from
high to low R
if ATTENTION ASSIST is unable to calculate
the attention level and cannot issue a warn-
ing, the System Suspended
message
appears. The bar display then changes the
display, e.g. if you are driving at a speed
below 37 mph (60 km/h) or above 124 mph
(200 km/ h) .
Activating ATTENTION ASSIST X
Activat e ATTENTION ASSIST usin g th e on -
boar d computer ( Y
page 228).
The system determine s th e attention level
of th e driver depending on th e set ting
selected:
If Standard is selected: th e sensitivit y wit h
whic h th e system determine s th e attention
level is set to normal.
If Sensitive is selected: th e sensitivit y is set
higher. The attention level detecte d by Atten-
tion Assis t is adapted accordingly and th e
driver is warned earlier .
When ATTENTI ON ASSIST is deactivated, th e