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168 Driving and parking
Function of Active Speed Limit Assist
If speed limit change between 12 mph
(20 km/h) and 80 mph (130 km/h) is detected
and the automatic adoption of speed limits is
active, it will be automatically adopted as the
stored speed (
page 195).
/
The driven speed is adjusted when the vehicle is
level with the traffic sign at the latest. In the
case of signs indicating entry into an urban area,
the speed is adapted according to the speed
permitted within the urban area. The speed limit
display in the Instrument Display is always upda‐
ted 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 freeway), the recom‐
mended speed is automatically adopted as the
stored speed. The system uses the speed stored
on an unlimited stretch of road as the recom‐
mended speed. If you do not alter the stored
speed on an unlimited stretch of road, the rec‐
ommended 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.
Observe the notes on driving systems and your
responsibility; you may otherwise fail to recog‐
nize dangers (
page 153).
/
System limits
The system limits of Traffic Sign Assist apply to
the detection of traffic signs (
page 194).
/
Speed limits below 12 mph (20 km/h) are not
automatically adopted by the system as the
stored speed. 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 to a vehi‐
cle with a trailer is not detected by the system.
Adjust the speed in these situations.
& 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:
at speed limits below 12 mph (20 km/h)
R
in wet conditions 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
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traffic and weather conditions.
Function of route-based speed adaptation
When Active Distance Assist DISTRONIC is acti‐
vated, the vehicle speed will be adapted accord‐
ingly to the route events ahead. Depending on
the drive program selected, the vehicle negoti‐
ates a route event ahead in a fuel-saving, com‐
fortable or dynamic manner. When the route
event has been passed, the vehicle accelerates
again to the stored speed. The set distance to
the vehicle in front, vehicles detected ahead and
speed restrictions ahead are taken into account.
Route-based speed adaptation can be config‐
ured in the multimedia system (
/
page 169).
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