Mercedes-Benz 2015 M-Class Operator's Manual page 204

Driving systems
202
If DISTRONIC PLUS detects that the vehicle in
front has slowed down, it brakes your vehicle.
In this way, the distance you have selected is
maintained.
If DISTRONIC PLUS detects a faster-moving
vehicle in front, it increases the driving speed.
However, the vehicle is only accelerated up to
the speed you have stored.
If you depress the brake, DISTRONIC PLUS is
deactivated unless your vehicle is stationary.
Changing lanes
If you change to the passing lane, DISTRONIC
PLUS supports you when:
you are driving faster than 40 mph
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(60 km/h)
DISTRONIC PLUS is maintaining the dis-
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tance to a vehicle in front
you switch on the appropriate turn signal
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DISTRONIC PLUS does not detect a danger
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of collision
If these conditions are fulfilled, your vehicle is
accelerated. Acceleration will be interrupted
if changing lanes takes too long or if the dis-
tance between your vehicle and the vehicle in
front becomes too small.
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When changing lanes, DISTRONIC PLUS
monitors the left lane on left-hand drive
vehicles and the right lane on right-hand
drive vehicles.
Stopping
G WARNING
When leaving the vehicle, even if it is braked
only by DISTRONIC PLUS, it could roll away if:
there is a malfunction in the system or in
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the voltage supply.
DISTRONIC PLUS has been deactivated
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with the cruise control lever, e.g. by a vehi-
cle occupant or from outside the vehicle.
the electrical system in the engine com-
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partment, the battery or the fuses have
been tampered with.
the battery is disconnected.
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the accelerator pedal has been depressed,
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e.g. by a vehicle occupant.
There is a risk of an accident.
If you wish to exit the vehicle, always turn off
DISTRONIC PLUS and secure the vehicle
against rolling away.
If DISTRONIC PLUS detects that the vehicle in
front is stopping, it brakes your vehicle until it
is stationary.
Once your vehicle is stationary, it remains
stationary and you do not need to depress the
brake.
After a time, the electric parking brake
secures the vehicle and relieves the service
brake.
Depending on the specified minimum dis-
tance, your vehicle will come to a standstill at
a sufficient distance behind the vehicle in
front. The specified minimum distance is set
using the control on the cruise control lever.
The electric parking brake automatically
secures the vehicle if DISTRONIC PLUS is
activated and:
the driver's door is open and the driver's
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seat belt is unfastened.
the engine is switched off, unless it is auto-
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matically switched off by the ECO start/
stop function.
a system malfunction occurs.
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the power supply is not sufficient.
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On steep uphill or downhill inclines or if there
is a malfunction, the transmission may also
automatically be shifted into position P.