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166 Driving and parking
updated when the vehicle is level with the traffic
sign.
If there is no speed restriction on an unlimited
stretch of road (e.g. on a highway), the recom‐
mended speed is adopted as the stored speed.
The system uses the speed stored on an unlimi‐
ted stretch of road as the recommended speed.
If you do not alter the stored speed on an unlimi‐
ted stretch of road, the recommended speed is
80 mph (130 km/h).
If Active Distance Assist DISTRONIC has been
put into passive mode by pressing the accelera‐
tor pedal, only speed limits which are higher
than the set speed are adopted.
Active Speed Limit Assist can be configured in
the multimedia system (
page 195).
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Active Speed Limit Assist is only an aid. The
driver is responsible for keeping a safe distance
to the vehicle in front, for vehicle speed and for
braking in good time. The maximum permissible
speed also depends on factors such as the road
surface and traffic conditions.
System limitations
Temporary speed restrictions (e.g. for a certain
time or due to weather conditions) cannot be
properly detected by the system. The maximum
permissible speed applying for a vehicle with a
trailer is not detected by the system. In these sit‐
uations you must adjust your speed yourself.
& WARNING Risk of accident due to Active
Speed Limit Assist adapting the vehicle's
speed
The speed adopted by Active Speed Limit
Assist may be too high or incorrect in some
individual cases, such as:
In the wet or in fog
R
When towing a trailer
R
Ensure that the driven speed complies
#
with traffic regulations.
Adjust the driving speed to suit current
#
traffic and weather conditions.
Function of route-based speed adaptation
%
The availability of the following function is
country-dependent.
When Distance Assist DISTRONIC is active, the
function adjusts the speed depending on the
route events ahead. Depending on the drive pro‐
gram selected, the vehicle negotiates the route
event ahead in a fuel-saving, comfortable or
dynamic manner. When the route event has been
passed, the vehicle accelerates again to the
stored speed. The set distance to the vehicle
ahead, vehicles detected ahead and speed
restrictions ahead are taken into account.
Route-based speed adjustment can by config‐
ured in the multimedia system (
Route events ahead are:
Bends
R
T-intersection, traffic circles and toll stations
R
Turns and exits
R
%
When the toll station is reached, Active Dis‐
tance Assist DISTRONIC adopts the speed as
the stored speed.
page 167).
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