Traffic Sign Assist detects traffic signs with multifunction camera 
and assists you by displaying detected speed limits and overtaking restrictions in the instrument cluster. If the system detects that you are driving onto a section of road in the wrong direction of travel, it triggers a warning. The camera also detects traffic signs with a restriction indicated by an additional sign (e.g. in wet conditions).
Traffic Sign Assist is only an aid. It cannot always reliably detect the maximum permissible speed and the applicable traffic signs. The driver is responsible for complying with the applicable traffic regulations.
The system can warn you if you unintentionally exceed the maximum permissible speed. To do this, you can specify in the multimedia system by how much the maximum permissible speed can be exceeded before a warning is issued. You can specify whether the warning is to be just a visual warning or an acoustic one as well. If the automatic speed acceptance for Active Distance Assist DISTRONIC is activated, the warnings are suppressed.
Display of speed restriction signs has priority over other recognised traffic signs, e.g. overtaking restriction signs.
When the vehicle changes roads, e.g. slip road or motorway exit.
When a village or town boundary is passed which is stored in the digital map.
Traffic Sign Assist is not available in all countries. If it is unavailable, display is shown in the speedometer.
Vehicles with Driving Assistance Package: the system can warn you if you approach a pedestrian crossing with your vehicle. A message appears in the instrument cluster.
The warning occurs if appropriate traffic signs or road markings are recognised and pedestrians are present in the danger zone.
If you are driving in conditions of poor visibility, e.g. due to insufficient illumination of the road, highly variable shade conditions, or due to rain, snow, fog or heavy spray.
You are affected by glare, e.g. from oncoming traffic, the sun or reflections.
The windscreen is dirty in the area of the multifunction camera, or the camera is misted up, damaged or covered.
If the traffic signs are hard to detect, e. g. due to dirt or snow or insufficient lighting, or because they are covered.
If the information on the navigation system's digital map is incorrect or out of date.
The signs are ambiguous, e.g. traffic signs on construction sites or in adjacent lanes.