ing, the system recognizes certain conditions
and warns you accordingly.
The warning vibration occurs earlier if:
R
you approach the outer lane marking on a
bend.
R
the road has very wide lanes, e.g. a freeway.
R
the system recognizes solid lane markings.
The warning vibration occurs later if:
R
the road has narrow lanes.
R
you cut the corner on a bend.
Alertness Assistant ATTENTION
ASSIST
General notes
ATTENTION ASSIST helps you during long,
monotonous journeys such as on freeways and
interstate highways. It is active in the 40 mph
(60 km/h) to 125 mph (200 km/h) range. If
ATTENTION ASSIST detects typical indicators of
fatigue or increasing lapses in concentration on
the part of the driver, it suggests taking a break.
Important safety notes
ATTENTION ASSIST is only an aid. The system
may not always detect fatigue or lapses in con-
centration until too late, or may not detect them
at all. ATTENTION ASSIST is not a substitute for
a well-rested and attentive driver.
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 approx-
imately 30 minutes
R
if the road condition is poor, e.g. if the surface
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 accel-
eration
R
if you are predominantly driving at a speed
below 40 mph (60 km/h) or above 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 and starts assessing
your attention again when you continue your
journey if:
R
you switch off the engine
R
you take off your seat belt and open the driv-
er's door, e.g. for a change of drivers or to
take a break
Displaying the attention level
For vehicles with steering wheel buttons you can
have the current ATTENTION ASSIST (Attention
Level) assessment displayed.
X
Select
Status Overview
Status Overview
in the
Assist.
Assist.
menu and display the attention level
(
Y
page 184).
The following information is displayed:
R
the length of the journey since the last break
R
the attention level determined by ATTENTION
ASSIST, displayed in a bar display in five levels
from low to high
R
if ATTENTION ASSIST is unable to calculate
the attention level and cannot output a warn-
ing, the
System
System Passive
Passive
message appears in
the display. The bar display is then dimmed.
This is the case, for example, if you are pre-
dominantly driving at a speed below 40 mph
(60 km/h) or above 125 mph (200 km/h).
Activating ATTENTION ASSIST
X
Activating ATTENTION ASSIST with the on-
board computer:
R
on vehicles without steering wheel buttons
(
Y
page 175)
R
on vehicles with steering wheel buttons
(
Y
page 185)
For vehicles with steering wheel buttons, the
system determines the attention level of the
driver depending on the setting selected:
150
Driving systems
Driving
and
pa
rk
ing
