Mercedes-Benz S-Class 2020 Owner's Manual page 249

246 Driving and parking
in wet conditions or in fog
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when towing a trailer
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Ensure that the driven speed complies
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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 activated
in the multimedia system ( page 247).
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The following route events are taken into
account:
Bends
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Roundabouts
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T-junctions
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Turns and exits
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Traffic jams ahead (only with Live Traffic )
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Also, the speed is reduced if the turn signal indi‐
cator to change lanes is switched on and one of
the following situations is detected:
Turning off at junctions
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Driving on slowing-down lanes
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Driving on lanes adjacent to slowing-down
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lanes
The driver is responsible for choosing the right
speed and observing other road users. This
applies in particular to junctions, roundabouts
and traffic lights, as route-based speed adapta‐
tion does not brake the vehicle to a standstill.
If a corresponding route event is detected while
route guidance is active, the first speed adjust‐
ment is carried out automatically. If the turn sig‐
nal indicator is switched on, the selected route is
confirmed and further speed adjustment is acti‐
vated.
Speed adaptation is cancelled in the following
cases:
If the turn signal indicator is switched off
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before the route event and it is therefore
assumed that the route event is not relevant
to the driver.
If the driver depresses the accelerator or
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brake pedal during the process.
System limits
Route-based speed adaptation does not take
right of way regulations into account. The driver
is responsible for complying with road traffic
regulations and driving at a suitable speed.
In difficult conditions, the speed selection made
by the system may not always be suitable:
unclear roads
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road narrowing
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varying maximum permissible speeds in indi‐
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vidual lanes, for example at toll stations
wet road surfaces, snow or ice
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if transport equipment, for example a trailer
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or bicycle rack, is attached to the trailer