Mercedes-Benz S-CLASS 2017 Operator's Manual page 207

At a distance of approximately 1.6 ft (0.5 m) ;
from the vehicle, Active Blind Spot Assist mon-
itors the area up to 10 ft (3 m) next to = and
behind : your vehicle, as shown in the picture.
The detection of obstacles can be impaired in
the case of:
there is dirt on the sensors or anything else
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covering the sensors
poor visibility, e.g. due to rain, snow or spray
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Vehicles in the monitoring range are then not
indicated.
Active Blind Spot Assist may not detect narrow
vehicles, such as motorcycles or bicycles, or
may only detect them too late.
If the lanes are narrow, vehicles driving in the
lane beyond the lane next to your vehicle may be
indicated, especially if the vehicles are not driv-
ing in the middle of their lane. This may be the
case if there are vehicles at the inner edge of
your lane.
Due to the nature of the system:
warnings may be issued in error when driving
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close to crash barriers or similar solid lane
borders.
warnings may be interrupted when driving
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alongside particularly long vehicles, e.g.
trucks, for a prolonged time.
Driving systems
Warning lamp
Active Blind Spot Assist is not operational at
speeds below approximately 20 mph (30 km/h).
Vehicles in the monitoring range are then not
indicated.
If a vehicle is detected within the blind spot
monitoring range at speeds above 20 mph
(30 km/h), warning lamp : on the correspond-
ing side lights up red. This warning is always
emitted when a vehicle enters the blind spot
monitoring range from behind or from the side.
When you overtake a vehicle, the warning only
occurs if the difference in speed is less than
7 mph (12 km/h).
If you select the reverse gear, Active Blind Spot
Assist is not operational.
The brightness of the warning lamps is auto-
matically adapted to the brightness of the sur-
roundings.
When Active Blind Spot Assist is activated, gray
radar waves propagating backwards appear
next to the vehicle in the assistance display in
the multifunction display. Above a speed of
20 mph (30 km/h), the color of the radar waves
in the assistance display changes to green ;.
Active Blind Spot Assist is then ready for use.
Visual and acoustic collision warning
If you switch on the turn signals to change lanes
and a vehicle is detected in the side monitoring
range, you receive a visual and acoustic collision
warning. You will then hear a double warning
tone and red warning lamp flashes. If the turn
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