G12�Driver�Assistance�Systems
11.�Road�Sign�Recognition
46
11.1.�Operation
The�road�sign�recognition�can�be�switched�on�and�off�in�the�iDrive�menu.�by�making�the�following
selection�via�the�controller:
• "My�Vehicle"
• "System�settings"
• "Displays"
• "Instrument�Cluster"
• Apply�desired�settings.
11.2.�Limits�of�the�system
Road�signs�for�top�speed�limitations�that�do�not�comply�with�the�legal�standard,�particularly�those
without�circular�frames,�are�not�always�detected.�The�same�also�applies�for�traffic�signs�which�are�fully
or�partially�covered�by�labels,�dirt�or�vegetation.�Long�distances�to�the�road�sign,�high�driving�speeds
and�poor�weather�conditions,�particularly�at�night,�make�it�more�difficult�for�the�system�to�recognize
road�signs�reliably.�To�ensure�the�current�top�speed�limitations�are�displayed�as�accurately�as�possible,
the�data�of�the�navigation�road�map�should�be�up-to-date.
The�functionality�of�the�road�sign�recognition�may�be�impaired�in�the�following�situations�and�may�lead
to�incorrect�information�being�displayed:
• heavy�fog,�rain�or�snow
• if�signs�are�covered�by�objects
• If�driving�at�close�proximity�to�a�vehicle�driving�ahead
• Strong�light�in�the�camera�lens
• if�the�windscreen�in�front�of�the�interior�mirror�is�misted�over,�soiled�or�covered�by�stickers,�etc.
• as�a�result�of�incorrect�detection�by�the�camera
• if�the�top�speed�limitations�stored�in�the�navigation�system�are�incorrect
• in�areas�not�covered�by�the�navigation�system
• in�the�event�of�deviations�from�the�navigation,�e.g.�due�to�modified�road�layouts
• when�overtaking�buses�or�trucks�with�speed�limit�stickers
• if�road�signs�do�not�correspond�to�the�standard
• when�calibrating�the�camera�immediately�after�vehicle�delivery.
Supplementary�sign�recognition
Only�additional�characters�with�symbols�(icons)�can�be�recognized�by�the�system,�such�as�"in�wet
weather",�"in�rain/snow",�"truck"�or�"trailer",�etc.�Text�notes�on�additional�characters�can�generally�not
be�read�or�interpreted.
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