Mercedes-Benz A-Class 2021 Operator's Manual page 169

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)
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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 an economical, 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.
You can activate and deactivate route-based
speed adaptation in the multimedia system
( page 168).
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The following route events are taken into
account:
Curves
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T-intersections, roundabouts and toll stations
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Turns and exits
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Traffic jams ahead (only with Live Traffic
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Information )
% When the toll station is reached, Active Dis‐
tance Assist DISTRONIC adopts the speed as
the stored speed.
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 intersections
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Driving and parking 167
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 intersections, round‐
abouts and traffic lights, as route-based speed
adaptation does not brake the vehicle to a stand‐
still.
When route guidance is active, the first speed
adjustment is carried out automatically. If the
turn signal indicator is switched on, the selected
route is confirmed and further speed adjustment
is activated.
Speed adaptation is canceled in the following
cases:
If the turn signal indicator is switched off
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before the route event.
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