Mercedes-Benz C-Class 2014 Owner's Manual page 260

The display can also be updated without a
visible traffic sign if:
the vehicle changes roads (e.g. motorway
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exit or slip road)
a village or town boundary is passed which
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is stored in the digital map
the last traffic sign detected by the camera
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has not been repeated
If a sign indicating the end of a restriction
(speed limit or overtaking restriction) is
passed, the sign is displayed for five seconds.
The applicable traffic regulation then appears
in the instrument cluster.
The camera also detects traffic signs with a
restriction indicated by an additional sign
(e.g. in wet conditions).
The traffic signs are only displayed with the
restrictions if:
the regulation must be observed with the
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restriction, or
Traffic Sign Assist is unable to determine
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whether the restriction applies
If Traffic Sign Assist is unable to determine a
maximum permitted speed from any of the
available sources, no speed limit is displayed
in the instrument cluster either.
Traffic Sign Assist is not available in all coun-
tries. In this case, display : is shown in the
speedometer.
Important safety notes
Traffic Sign Assist is only an aid and is not
always able to correctly display speed limits
and overtaking restrictions. Traffic signs
always have priority over the Traffic Sign
Assist display.
The system may be either functionally
impaired or temporarily unavailable if:
visibility is poor, e.g. due to snow, rain, fog
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or spray
there is glare, e.g. from the sun being low in
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the sky
there is dirt, ice or misting on the wind-
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screen in the vicinity of the camera
traffic signs are hard to detect (dirt, ice,
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snow)
the traffic signs are insufficiently lit at night
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signs are ambiguous (e.g. traffic signs on
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construction sites or in adjacent lanes)
the information in the digital street map of
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the navigation system is incorrect or out of
date
Activating Traffic Sign Assist
Activate the Traffic Sign Assist display
X
using the on-board computer
( page 308).
Y
If you have activated the display of Traffic
Sign Assist in the on-board computer, the
traffic regulations (speed limits and overtak-
ing restrictions) are displayed in the instru-
ment cluster. The wrong-way warning
remains active even when the display has
been deactivated.
Instrument cluster display
Speed limit with overtaking restriction
Driving systems
257
Z