Mercedes-Benz A-Class Operator's Manual page 157

If the autonomous braking function or the situa‐
tion-dependent braking assistance is triggered,
additional preventive measures for occupant
®
protection (PRE-SAFE ) may also be initiated, if
the vehicle is equipped with these.
& WARNING Risk of an accident caused by
limited detection performance of Active
Brake Assist
Active Brake Assist cannot always clearly
identify objects and complex traffic situa‐
tions.
In such cases, Active Brake Assist might:
Give a warning or brake without reason
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Not give a warning or not brake
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Always pay careful attention to the traf‐
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fic situation; do not rely on Active Brake
Assist alone. Active Brake Assist is only
an aid. The driver is responsible for
maintaining a suitable distance to the
vehicle in front, vehicle speed and for
braking in good time.
Be prepared to brake or swerve if nec‐
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essary.
Also observe the system limitations of Active
Brake Assist.
Driving and parking 155
The individual subfunctions are available in
the following speed ranges:
Distance warning function
The distance warning function issues a warning
at speeds:
From approximately 4 mph (7 km/h), if your
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vehicle is critically close to a vehicle or
pedestrian. An intermittent warning tone
sounds and the · distance warning lamp
lights up in the instrument cluster.
Brake immediately or take evasive action, provi‐
ded it is safe to do so and the traffic situation
allows this.